02622nas a2200253   4500008004100000022001400041245017400055210006900229260000800298300001400306490000700320520168000327100002102007700002302028700001902051700002302070700002902093700001902122700004002141700002402181700001702205700002002222856012602242       2026                        eng d  a0897-475600aBright dual-phase organic luminescence from zero-dimensional lead halide hybrids via sensitized thermally activated delayed fluorescence for multifunctional applications0 aBright dualphase organic luminescence from zerodimensional lead   cMAY  a4668-46810 v383 a<p>
	Metal halide hybrids have long celebrated their halometallate moieties as the luminescent center, leaving organic cations behind. Although the thermally activated delayed fluorescence (TADF) strategy has enabled efficient solid-state organic emitters, the complex molecular design required for TADF emitters has limited their facile integration into metal halide hybrid architectures. Here, we demonstrate a versatile strategy wherein a nonemissive organic moiety (benzyltributylammonium) is incorporated into a zero-dimensional disphenoidal Pb-halide hybrid, [(C19H34N)2PbCl4], resulting in efficient TADF-based dual-phase organic emission sensitized by halometallate units in the solid state (crystalline; amorphous). These materials exhibit strong PLQY (similar to 85%) and tunable organic luminescence (blue emission in crystalline phase; cyan emission in amorphous phase) modulated by the packing extent of organic moiety. [PbX4]2- units act as absorptive centers that sensitize organic cations showing TADF-based strong emission. Ground and excited state density functional theory calculations reveal the unique origin of sensitized TADF organic luminescence. Rheological measurements characterize relaxation dynamics of glass &lt;-&gt; supercooled liquid transitions, establishing correlations between molecular packing, phase, and emission characteristics. This first demonstration of dual-phase, sensitized TADF-based organic luminescence in lead halide hybrids establishes a new design paradigm that bridges molecular and solid-state photophysics, opening avenues for multifunctional applications in LEDs, optical thermometry, and security technologies.</p>
1 aDas, Deep, Kumar1 aSarma, Dhritismita1 aKumar, Praveen1 aKhan, Akram, Aadil1 aMadhusoodhananan, Mahesh1 aKudlu, Ashwath1 aAjithkumar, Thalasseril, Govindanku1 aPujala, Ravi, Kumar1 aMahata, Arup1 aKundu, Janardan  uhttps://library.ncl.res.in/content/bright-dual-phase-organic-luminescence-zero-dimensional-lead-halide-hybrids-sensitized