00906nas a2200265 4500008004100000022001400041245009000055210006900145260000800214490000700222653002300229653001800252653002300270100002900293700002600322700002100348700002000369700001900389700002000408700003400428700001800462700001900480700001900499856012200518 2024 eng d a1613-681000aEntropy-driven reversible melting and recrystallization of layered hybrid perovskites0 aEntropydriven reversible melting and recrystallization of layere cNOV0 v2010ahybrid perovskites10aphotodetector10areversible melting1 aRajput, Parikshit, Kumar1 aSalunkhe, Parashurama1 aSarma, Manmayuri1 aBasu, Meghasree1 aGopal, Animesh1 aJoshi, Aprajita1 aShingote, Ajinkya, Sundarnath1 aSaha, Surajit1 aRahman, Atikur1 aNag, Angshuman uhttps://library.ncl.res.in/content/entropy-driven-reversible-melting-and-recrystallization-layered-hybrid-perovskites06096nas a2200217 4500008004100000245005000041210005000091260000800141490000700149520545000156100001805606700001905624700001805643700002005661700002105681700001805702700002305720700003105743700001905774856008505793 2025 eng d00aUltrabroad near infrared emitting perovskites0 aUltrabroad near infrared emitting perovskites cJAN0 v643 a

Phosphor converted light emitting diodes (pc-LEDs) have revolutionized solid-state white lighting by replacing energy-inefficient filament-based incandescent lamps. However, such a pc-LED emitting ultrabroad near-infrared (NIR) radiations still remains a challenge, primarily because of the lack of ultrabroad NIR emitting phosphors. To address this issue, we have prepared 2.5 % W4+-doped and 2.8 % Mo4+-doped Cs2Na0.95Ag0.05BiCl6 perovskites emitting ultrabroad NIR radiation with unprecedented spectral widths of 434 and 468 nm, respectively. Upon band-edge excitation, the soft lattice of the host exhibits broad self-trapped exciton (STE) emission covering NIR-I (700 nm), which then nonradiatively excites the dopants. The mathematical equation –donor ligand Cl reduces the energy of dopant d–d transitions emitting NIR-II with a peak at ~950 nm. Vibronic coupling broadens the dopant emission. The large spin-orbit coupling and local structural distortion might possibly enhance the dopant emission intensity, leading to an overall NIR photoluminescence quantum yield ~40 %. The composite of our ultrabroad NIR phosphors with biodegradable polymer polylactic acid could be processed into free-standing films and 3D printed structures. Large (170mathematical equation 170 mathematical equation ), robust, and thermally stable 3D printed pc-LED panels emit ultrabroad NIR radiation, demonstrating NIR imaging applications.

1 aSaikia, Sajid1 aGopal, Animesh1 aRathod, Radha1 aJoshi, Aprajita1 aPriolkar, K., R.1 aSaha, Surajit1 aSantra, Pralay, K.1 aShanmuganathan, Kadhiravan1 aNag, Angshuman uhttps://library.ncl.res.in/content/ultrabroad-near-infrared-emitting-perovskites