01678nas a2200193 4500008004100000022001400041245009400055210006900149260000800218300001600226490000700242520098400249100001801233700002801251700003001279700002301309700003001332856012201362 2015 eng d a1359-734500aSeeded on-surface supramolecular growth for large area conductive donor-acceptor assembly0 aSeeded onsurface supramolecular growth for large area conductive cMAY a10439-104420 v513 a

Charge transport features of organic semiconductor assemblies are of paramount importance. However, large-area extended supramolecular structures of donor-acceptor combinations with controlled self-assembly pathways are hardly accessible. In this context, as a representative example, seeded on-surface supramolecular growth of tetrathiafulvalene and tetracyano-p-quinodimethane (TTF-TCNQ) using active termini of solution-formed sheaves has been introduced to form an extended assembly. We demonstrate for the first time, the creation of a large-area donor-acceptor assembly on the surface, which is practically very tedious, using a seeded, evaporation-assisted growth process. The excellent molecular ordering in this assembly is substantiated by its good electrical conductivity (similar to 10(-2) S cm(-1)). The on-surface assembly via both internally formed and externally added sheaf-like seeds open new pathways in supramolecular chemistry and device applications.

1 aGoudappagouda1 aChithiravel, Sundaresan1 aKrishnamoorthy, Kothandam1 aGosavi, Suresh, W.1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/seeded-surface-supramolecular-growth-large-area-conductive-donor-acceptor-assembly01705nas a2200181 4500008004100000245012300041210006900164260000800233300001400241490000700255520098100262100001801243700003301261700003801294700003101332700003001363856013001393 2017 eng d00aCascade energy transfer and tunable emission from nanosheet hybrids: locating acceptor molecules through chiral doping0 aCascade energy transfer and tunable emission from nanosheet hybr cJUL a7072-70750 v533 aLight harvesting donor-acceptor assemblies are indispensable to efficiently tap photons. In an attempt to improve the light harvesting efficiency of an acceptor doped assembly, we design and synthesize a donor-acceptor-donor triad which exhibits an exceptional intramolecular energy transfer with excellent efficiency. Moreover, a facile cascade energy transfer (energy funnelling) is observed in the presence of a series of second acceptors (63-91% efficiency) with tunable emission colours. Self-assembled nanosheets formed by the triad in the presence of acceptors exhibit cascade energy transfer assisted tunable emission. In addition, use of chiral acceptors induces chirality to the triad and results in the formation of chiral nanosheets alongwith cascade energy transfer. Here chiral induction, nanosheet formation and cascade energy transfer in the presence of chiral acceptors are used as tools to probe the intercalation of acceptor molecules in the donor scaffold.1 aGoudappagouda1 aWakchaure, Vivek, Chandrakan1 aRanjeesh, Kayaramkodath, Chandran1 aAbhai, Chalona, Antony Ral1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/cascade-energy-transfer-and-tunable-emission-nanosheet-hybrids-locating-acceptor-molecules02530nas a2200409 4500008004100000022001400041245011800055210006900173260000800242490000700250520127700257653001301534653003001547653001401577653001501591653000801606653001001614653001801624653001601642653001901658653001901677653002101696653001001717653002301727653001401750100003001764700001901794700001801813700001901831700001901850700002401869700001701893700002701910700003001937700002801967856012501995 2017 eng d a0947-653900aMixed-stack charge transfer crystals of pillar[5]quinone and tetrathiafulvalene exhibiting ferroelectric features0 aMixedstack charge transfer crystals of pillar5quinone and tetrat cSEP0 v233 a

Ferroelectric materials find extensive applications in the fabrication of compact memory devices and ultra-sensitive multifunctional detectors. Face-to-face alternate stacking of electron donors and acceptors effectuate long-range unidirectional ordering of charge-transfer (CT) dipoles, promising tunable ferroelectricity. Herein we report a new TTF-quinone system-an emerald green CT complex consisting pillar[5]quinone (P5Q) and tetrathiafulvalene (TTF). The CT crystals, as determined by single crystal synchrotron X-ray diffraction, adopt a 1:1 mixed-stack arrangement of donor and acceptor with alternating dimers of TTF and 1,4-dioxane encapsulated P5Q. The TTF-P5Q.dioxane crystal possesses a macroscopic polarization axis giving rise to ferroelectricity at room temperature. The CT complex manifests ferroelectric features such as optical polarization rotation, temperature-dependent phase transition and piezoelectric response in single crystals. Ferroelectric behavior observed in P5Q-based CT complex widens the scope for further work on this structurally intriguing and readily accessible cyclic pentaquinone.

10aAcceptor10aCharge-transfer complexes10aChemistry10aConductors10aDDQ10aDonor10aferroelectric10aMacrocycles10aOrganic Metals10aPi-interaction10aPillar[5]quinone10asalts10aTransfer Complexes10aTransport1 aShivakumar, Kilingaru, I.1 aSwathi, Kadaba1 aGoudappagouda1 aDas, Tamal, C.1 aKumar, Ashwani1 aMakde, Ravindra, D.1 aVanka, Kumar1 aNarayan, Kavassery, S.1 aBabu, Sukumaran, Santhosh1 aSanjayan, Gangadhar, J. uhttps://library.ncl.res.in/content/mixed-stack-charge-transfer-crystals-pillar5quinone-and-tetrathiafulvalene-exhibiting01557nas a2200217 4500008004100000022001400041245009800055210006900153260000800222300001400230490000700244520081000251100002501061700003201086700001801118700001501136700001701151700002001168700002401188856012701212 2018 eng d a1359-734500aMechano-responsive room temperature luminescence variations of boron conjugated pyrene in air0 aMechanoresponsive room temperature luminescence variations of bo cJUN a6028-60310 v543 a

Stimuli responsive tunable luminescence is a promising field of research. Even though mechanofluorescence is widely studied, mechanophosphorescence remains unexplored. Here we report the mechano-driven fluorescence and phosphorescence variations of a pyrene tetraboronic ester derivative. The fluorochromic and room temperature phosphorescence features are supported by theoretical studies and single crystal analysis. The mechanically ground fluorescence active but phosphorescence inactive pyrene tetraboronic ester exhibits room temperature phosphorescence in air withmechanical force. The efficient intermolecular electronic coupling in the dimer formed upon scratching enables a good communication between singlet and triplet states, hence resulting in room temperature mechanophosphorescence.

1 aWakchaure, Vivek, C.1 aRanjeesh, Kayaramkodath, C.1 aGoudappagouda1 aDas, Tamal1 aVanka, Kumar1 aGonnade, Rajesh1 aBabu, Sukumaran, S. uhttps://library.ncl.res.in/content/mechano-responsive-room-temperature-luminescence-variations-boron-conjugated-pyrene-air01708nas a2200157 4500008004100000245012000041210007300161260000800234490000700242520106900249100001801318700001801336700002701354700003001381856013901411 2018 eng d00aOne‐dimensional porphyrin‐fullerene (C60) assemblies: role of central metal ion in enhancing ambipolar mobility0 aOne‐dimensional porphyrin‐fullerene C60 assemblies role of centr cMAR0 v243 aOne-dimensional (1D) nanostructures of -conjugated molecules exhibiting excellent charge carrier mobilities have found much interest in organic electronic devices. Even though it is tedious to form such structures, the availability of highly delocalized electron and hole carriers in these donor (D)-acceptor (A) co-assemblies realize ambipolar charge transport. Here we report the successful demonstration of a simple solution casting method to create ambipolar donor-acceptor single crystalline assembly. 1D assemblies of 5,10,15,20-tetraphenylporphyrins (H2TPP, ZnTPP) and fullerene (C60) exhibit high ambipolar mobility in the range of 0.8-3.4 cm2/Vs for electrons and holes with high ON/OFF ratio and low threshold voltage. A direct experimental proof for the pivotal role of central Zn2+ in tetraphenyl porphyrin, which enables a strong D-A charge transfer interaction in the cocrystal and thereby induces electron (1.35 cm2/Vs), hole (3.42 cm2/Vs) mobilities, the highest reported for two component D-A assemblies using solution casting, is demonstrated.1 aGoudappagouda1 aGedda, Murali1 aKulkarni, Giridhar, U.1 aSukumaran, Santhosh, Babu uhttps://library.ncl.res.in/content/one%E2%80%90dimensional-porphyrin%E2%80%90fullerene-c60-assemblies-role-central-metal-ion-enhancing00987nas a2200193 4500008004100000022001400041245014700055210006900202260000900271300001400280490000700294520021000301100001800511700003300529700003800562700003100600700003000631856013200661 2019 eng d a1359-734500aCascade energy transfer and tunable emission from nanosheet hybrids: locating acceptor molecules through chiral doping (vol 53, pg 7072, 2017)0 aCascade energy transfer and tunable emission from nanosheet hybr cJUN  a6462-64620 v553 a

Correction for `Cascade energy transfer and tunable emission from nanosheet hybrids: locating acceptor molecules through chiral doping' by Goudappagouda et al., Chem. Commun., 2017, 53, 7072-7075.

1 aGoudappagouda1 aWakchaure, Vivek, Chandrakan1 aRanjeesh, Kayaramkodath, Chandran1 aAbhai, Chalona, Antony Ral1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/cascade-energy-transfer-and-tunable-emission-nanosheet-hybrids-locating-acceptor-molecules-002445nas a2200217 4500008004100000245009700041210006900138260000800207300001400215490000700229520166200236100003301898700000501931700001801936700003801954700002301992700002602015700003402041700003002075856012202105 2019 eng d00aCharge transfer liquid: a stable donor-acceptor interaction in the solvent-free liquid state0 aCharge transfer liquid a stable donoracceptor interaction in the cAUG a9371-93740 v553 a

Charge-transfer complexes have been an inspiration to develop many functional soft materials. However, most of those studies have focused on solution based assemblies wherein the explicit control of solvents and their polarity are crucial. In this context, we explore an efficient and stable charge transfer liquid using a solvent-free liquid dialkoxynaphthalene donor and a naphthalenediimide acceptor. It has been observed that irrespective of the donor-acceptor ratio, the charge-transfer liquid exhibited an unprecedented stability and retained characteristic features even at increased temperatures. The underlying intermolecular interactions leading to efficient CT have been examined by NMR techniques together with theoretical modelling studies. The concept of charge transfer liquid will be highly beneficial for the development of processable optoelectronically active materials.
 

1 aWakchaure, Vivek, Chandrakan1 a1 aGoudappagouda1 aRanjeesh, Kayaramkodath, Chandran1 aChakrabarty, Suman1 aRavindranathan, Sapna1 aRajamohanan, Pattuparambil, R1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/charge-transfer-liquid-stable-donor-acceptor-interaction-solvent-free-liquid-state00942nas a2200193 4500008004100000022001400041245013500055210006900190260000900259300000900268490000700277520020700284100003000491700001800521700002400539700003000563700002800593856012700621 2019 eng d a1359-734500aConducting nanofibres of solvatofluorochromic cyclohexanetrione-dithiolylidene-based C-3 symmetric molecule (vol 54, pg 212, 2018)0 aConducting nanofibres of solvatofluorochromic cyclohexanetrioned cJUN  a64610 v553 a

Correction for `Conducting nanofibres of solvatofluorochromic cyclohexanetrione-dithiolylidene-based C-3 symmetric molecule' by Kilingaru I. Shivakumar et al., Chem. Commun., 2018, 54, 212-215.

1 aShivakumar, Kilingaru, I.1 aGoudappagouda1 aGonnade, Rajesh, G.1 aBabu, Sukumaran, Santhosh1 aSanjayan, Gangadhar, J. uhttps://library.ncl.res.in/content/conducting-nanofibres-solvatofluorochromic-cyclohexanetrione-dithiolylidene-based-c-3-002056nas a2200241 4500008004100000022001400041245009200055210006900147260000800216300001600224490000800240520121300248100003801461700002601499700002901525700001801554700003301572700001801605700001501623700002401638700003001662856012201692 2019 eng d a0002-786300aImidazole-linked crystalline two-dimensional polymer with ultrahigh proton-conductivity0 aImidazolelinked crystalline twodimensional polymer with ultrahig cSEP a14950-149540 v1413 a

Proton-exchange membrane fuel cells are promising energy devices for a sustainable future due to green features, high power density, and mild operating conditions. A facile proton-conducting membrane plays a pivotal role to boost the efficiency of fuel cells, and hence focused research in this area is highly desirable. Major issues associated with the successful example of Nafion resulted in the search for alternate proton conducting materials. Even though proton carrier loaded crystalline porous organic frameworks have been used for protonconduction, the weak host-guest interactions limited their practical use. Herein, we developed a crystalline 2D-polymer composed of benzimidazole units as the integral part, prepared by the condensation of aryl acid and diamine in polyphosphoric acid medium. The imidazole linked-2D-polymer exhibits ultrahigh proton conductivity (3.2 X 10(-2) S cm(-1)) (at 95% relative humidity and 95 degrees C) in the pristine state, which is highest among the undoped porous organic frameworks so far reported. The present strategy of a crystalline proton-conducting 2D-polymer will lead to the development of new high performing crystalline solid proton conductor.

1 aRanjeesh, Kayaramkodath, Chandran1 aIlathvalappil, Rajith1 aVeer, Sairam, Dnyaneshwa1 aPeter, Joseph1 aWakchaure, Vivek, Chandrakan1 aGoudappagouda1 aRaj, Vipin1 aKurungot, Sreekumar1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/imidazole-linked-crystalline-two-dimensional-polymer-ultrahigh-proton-conductivity01522nas a2200217 4500008004100000245009800041210006900139260000800208300001400216490000700230520079600237100001801033700001901051700002201070700002101092700001201113700001401125700001801139700001701157856013001174 2019 eng d00aPaintable room-temperature phosphorescent liquid formulations of alkylated bromonaphthalimide0 aPaintable roomtemperature phosphorescent liquid formulations of  cFEB a2284-22880 v583 aOrganic phosphors have been widely explored with an understanding that crystalline molecular ordering is a requisite for enhanced intersystem crossing. In this context, we explored the room‐temperature phosphorescence features of a solvent‐free organic liquid phosphor in air. While alkyl chain substitution varied the physical states of the bromonaphthalimides, the phosphorescence remained unaltered for the solvent‐free liquid in air. As the first report, a solvent‐free liquid of a long swallow‐tailed bromonaphthalimide exhibits room‐temperature phosphorescence in air. Doping of the phosphor with carbonyl guests resulted in enhanced phosphorescence, and hence a large‐area paintable phosphorescent liquid composite with improved lifetime and quantum yield was developed.1 aGoudappagouda1 aManthanath, A.1 aWakchaure, V., C.1 aRanjeesh, K., C.1 aDas, T.1 aVanka, K.1 aNakanishi, T.1 aBabu, S., S. uhttps://library.ncl.res.in/content/paintable-room-temperature-phosphorescent-liquid-formulations-alkylated-bromonaphthalimide01754nas a2200193 4500008004100000245012000041210006900161260000800230300001400238490000700252520106000259100002101319700001501340700002201355700001801377700001701395700001701412856013101429 2019 eng d00aSquaraine-linked metalloporphyrin two-dimensional polymer photocatalyst for hydrogen and oxygen evolution reactions0 aSquarainelinked metalloporphyrin twodimensional polymer photocat cJAN a1627-16300 v553 aEfficient water splitting photocatalysts are an energetically demanding and cost-effective method for generating renewable energy. Significant research has been reported to advance this approach. However, the use of organic photocatalysts and the presence of residual catalysts trapped in the porous frameworks present major concerns about the efficiency of this strategy. Herein, we report the photocatalytic evolution of H2 and O2 by a multi-hydroxyl group-decorated metalloporphyrin-based two-dimensional catalyst developed via metal catalyst-free synthetic route. Though metalloporphyrins have long been used for catalytic functions, a heterogeneous photocatalyst delivering both H2 and O2 has not yet been realized. This polymer catalyst design enables the photocatalytic diatomic O2 release, a bottleneck in water splitting, in a facile way. Photocatalytic release of H2 as well as O2 occurs with long-term durability of 20 cycles in 300 days with negligible decrease in efficiency, thus demonstrating the excellent performance of this new catalyst.1 aRanjeesh, K., C.1 aGeorge, L.1 aWakchaure, V., C.1 aGoudappagouda1 aDevi, R., N.1 aBabu, S., S. uhttps://library.ncl.res.in/content/squaraine-linked-metalloporphyrin-two-dimensional-polymer-photocatalyst-hydrogen-and-oxygen02111nas a2200301 4500008004100000022001400041245007700055210006900132260000800201300001600209490000700225520116400232653001401396653001301410653002001423653003001443653001601473100002601489700001801515700002901533700003101562700001801593700002401611700002401635700002301659700003001682856009701712 2020 eng d a1433-785100aSelf-assembled helical arrays for the stabilization of the triplet state0 aSelfassembled helical arrays for the stabilization of the triple cJUL a13079-130850 v593 a

Room-temperature phosphorescence of metal and heavy atom-free organic molecules has emerged as an area of great potential in recent years. A rational design played a critical role in controlling the molecular ordering to impart efficient intersystem crossing and stabilize the triplet state to achieve room-temperature ultralong phosphorescence. However, in most cases, the strategies to strengthen phosphorescence efficiency have resulted in a reduced lifetime, and the available nearly degenerate singlet-triplet energy levels impart a natural competition between delayed fluorescence and phosphorescence, with the former one having the advantage. Herein, an organic helical assembly supports the exhibition of an ultralong phosphorescence lifetime. In contrary to other molecules, 3,6-phenylmethanone functionalized 9-hexylcarbazole exhibits a remarkable improvement in phosphorescence lifetime (>4.1 s) and quantum yield (11 %) owing to an efficient molecular packing in the crystal state. A right-handed helical molecular array act as a trap and exhibits triplet exciton migration to support the exceptionally longer phosphorescence lifetime.

10acarbazole10ahelicity10aphenylmethanone10aultralong phosphorescence10awaveguiding1 aNidhankar, Aakash, D.1 aGoudappagouda1 aKumari, Divya, S. Mohana1 aChaubey, Shailendra, Kumar1 aNayak, Rashmi1 aGonnade, Rajesh, G.1 aKumar, G., V. Pavan1 aKrishnan, Retheesh1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/self-assembled-helical-arrays-stabilization-triplet-state01896nas a2200241 4500008004100000022001400041245011600055210006900171260000800240300001100248490000800259520107900267653001301346653001701359653002001376653001901396100001801415700001801433700001801451700002301469700003001492856013201522 2020 eng d a0143-720800aTuning phosphorescence features of triphenylamines by varying functional groups and intermolecular interactions0 aTuning phosphorescence features of triphenylamines by varying fu cFEB a1079310 v1733 a

Organic room temperature phosphorescent materials are known for their synthetic feasibility, tunable phosphorescence wavelength and lifetime, etc. Hence new design strategies have been applied on various fluorophores to improve phosphorescence features. Among those, triphenylamines are phosphorescence active due to the presence of nitrogen atom, propeller molecular structure, and intermolecular interactions in the crystal state. Here we have studied the room temperature phosphorescence of a series of triphenylamines with various functional groups. Detailed studies have shown that the phosphorescence can be fine-tuned by functional group modification. A long phosphorescence lifetime around 100 ms at room temperature in air can be achieved by the interplay of intermolecular interactions, singlet-triplet energy gap and extent of intersystem crossing using functional group variation. Interestingly, an exciplex assisted ultralong phosphorescence lifetime (more than 20 times) is observed for a combination of triphenylamine and naphthalenemonoimide in air.

10aExciplex10afluorescence10aPhosphorescence10atriphenylamine1 aGoudappagouda1 aAsokan, Kiran1 aNayak, Rashmi1 aKrishnan, Retheesh1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/tuning-phosphorescence-features-triphenylamines-varying-functional-groups-and-intermolecular01590nas a2200181 4500008004100000022001400041245007400055210006900129260000900198300001400207490000700221520098100228100001801209700002601227700002201253700003001275856010301305 2021 eng d a1477-052000aAggregation-induced phosphorescence of an anthraquinone based emitter0 aAggregationinduced phosphorescence of an anthraquinone based emi cFEB  a1004-10080 v193 a

Room temperature phosphorescence (RTP) of metal-free organic molecules is a hot topic of current research interest. RTP can be enhanced through aggregation, crystallization, and the support of polymers and host-guest assemblies. The characteristics of highly phosphorescent aggregates formed from conventional chromophores make them ideal candidates for many potential applications. In this direction, we focused on the aggregation-induced phosphorescence of an anthraquinone derivative AqC6 in solution and in crystal state. The weakly emissive dilute solution exhibits a tunable emission with enhanced intensity and room temperature phosphorescence by increasing the concentration and solvent-antisolvent combination. The enhanced phosphorescence of crystals has been recreated in the solution by making use of aggregation. Interestingly, the support of PMMA enabled AqC6 to achieve enhanced processability, phosphorescence lifetime (174 ms) and quantum yield (5%).

1 aGoudappagouda1 aNidhankar, Aakash, D.1 aNayak, Rashmi, A.1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/aggregation-induced-phosphorescence-anthraquinone-based-emitter02006nas a2200181 4500008004100000022001400041245006000055210005900115260000800174300001400182490000700196520142700203100002601630700001801656700002501674700003001699856009501729 2021 eng d a2041-652000aEfficient metal-free organic room temperature phosphors0 aEfficient metalfree organic room temperature phosphors cMAR a4216-42360 v123 a

An innovative transformation of organic luminescent materials in recent years has realised the exciting research area of ultralong room-temperature phosphorescence. Here the credit for the advancements goes to the rational design of new organic phosphors. The continuous effort in the area has yielded wide varieties of metal-free organic systems capable of extending the lifetime to several seconds under ambient conditions with high quantum yield and attractive afterglow properties. The various strategies adopted in the past decade to manipulate the fate of triplet excitons suggest a bright future for this class of materials. To analyze the underlying processes in detail, we have chosen high performing organic triplet emitters that utilized the best possible ways to achieve a lifetime above one second along with impressive quantum yield and afterglow properties. Such a case study describing different classes of metal-free organic phosphors and strategies adopted for the efficient management of triplet excitons will stimulate the development of better candidates for futuristic applications. This Perspective discusses the phosphorescence features of single- and multi-component crystalline assemblies, host-guest assemblies, polymers, and polymer-based systems under various classes of molecules. The various applications of the organic phosphors, along with future perspectives, are also highlighted.

1 aNidhankar, Aakash, D.1 aGoudappagouda1 aWakchaure, Vivek, C.1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/efficient-metal-free-organic-room-temperature-phosphors01938nas a2200193 4500008004100000022001400041245012200055210006900177260000800246300001600254490000700270520121800277100003301495700001801528700001501546700002601561700003001587856012701617 2021 eng d a2040-336400aExcimer to exciplex transition through realization of donor-acceptor interactions in luminescent solvent-free liquids0 aExcimer to exciplex transition through realization of donoraccep cJUN a10780-107840 v133 aLuminescent solvent-free organic liquids are known for their enhanced quantum yield, color tunability, and availability of a matrix for other dopants to generate hybrid luminescent materials with improved features for newer applications. Herein, we report a donor-acceptor based luminescent ``exciplex liquid'' by utilizing the slightly different electron affinity of the acceptor molecules. A red-shifted broad exciplex emission exhibited by the donor-acceptor pair even at a lower concentration of the acceptor (0.001 equiv.) indicates high efficiency in the solvent-free state. A detailed NMR study revealed weak intermolecular interactions between the donor and acceptor in the solvent-free matrix that stabilizes the exciplex liquid. The failure of structurally similar solid counterparts to form an exciplex confirms the advantage of the available supportive liquid matrix. Besides, the luminescent exciplex liquid is found efficient in sensing application, which is unachievable by either the individual liquids or their solid counterparts. Here, a transition of a donor-acceptor pair from a solid to solvent-free liquid results in a new hybrid liquid that can be an alternative for solid sensor materials.1 aWakchaure, Vivek, Chandrakan1 aGoudappagouda1 aDas, Tamal1 aRavindranathan, Sapna1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/excimer-exciplex-transition-through-realization-donor-acceptor-interactions-luminescent01605nas a2200229 4500008004100000022001400041245012100055210006900176260000900245300001400254490000700268520078700275100003301062700002101095700002601116700001801142700001801160700001801178700002601196700003001222856012301252 2022 eng d a1359-734500aDonor-acceptor based solvent-free organic liquid hybrids with exciplex emission and room temperature phosphorescence0 aDonoracceptor based solventfree organic liquid hybrids with exci cFEB  a1998-20010 v583 aSolvent-free organic liquids are well-known for their excellent luminescence features. Hence, the recent developments in this area have marked them as potential emitters with high quantum yield and enhanced processability. The support of an available liquid matrix enables doping to deliver hybrid liquids with intriguing luminescence features. In this direction, we report solvent-free liquid donor-acceptor pairs with exciplex emission and room temperature phosphorescence at very low acceptor loading. The underlying weak intermolecular interactions have been revealed by 2D NMR techniques and theoretical calculations. The formation of large-area thin films by exciplex and phosphorescent liquid hybrids will encourage the development of scalable lighting and display materials.1 aWakchaure, Vivek, Chandrakan1 aVeer, Sairam, D.1 aNidhankar, Aakash, D.1 aGoudappagouda1 aNayak, Rashmi1 aAsokan, Kiran1 aRavindranathan, Sapna1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/donor-acceptor-based-solvent-free-organic-liquid-hybrids-exciplex-emission-and-room02132nas a2200301 4500008004100000022001400041245011400055210006900169260000900238490000700247520111200254653001601366653002001382653000901402653002001411653000901431100002901440700001801469700002901487700002401516700002901540700002501569700001801594700002501612700003101637700003001668856013201698 2023 eng d a1861-472800aThermally activated delayed fluorescent solvent-free organic liquid hybrids for tunable emission applications0 aThermally activated delayed fluorescent solventfree organic liqu cJUL 0 v183 a

The synthetic feasibility and excellent luminescence features of organic molecules attracted much attention and were eventually found useful in lighting applications. In this context, a solvent-free organic liquid having attractive thermally activated delayed fluorescence features in bulk along with high processability has prime importance. Herein, we report a series of naphthalene monoimide-based solvent-free organic liquids exhibiting cyan to red thermally activated delayed fluorescence with luminescence quantum yields up to 80% and lifetimes between 10 to 45 mu s. An effective approach explored energy transfer between liquid donors with various emitters exhibiting tunable emission colors, including white. The high processability of liquid emitters improved the compatibility with polylactic acid and was used for developing multicolor emissive objects using 3D printing. Our demonstration of the thermally activated delayed fluorescence liquid will be much appreciated as a processable alternate emissive material suitable for large-area lighting, display, and related applications.

10a3D printing10aEnergy Transfer10aOLED10aOrganic Liquids10aTADF1 aNidhankar, Aakash, D. D.1 aGoudappagouda1 aKothavade, Premkumar, D.1 aDongre, Sangram, D.1 aVeer, Sairam, Dnyaneshwa1 aDash, Soumya, Ranjan1 aRajeev, Kavya1 aUnni, K., N. Narayan1 aShanmuganathan, Kadhiravan1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/thermally-activated-delayed-fluorescent-solvent-free-organic-liquid-hybrids-tunable-emission