High Emission Quantum Yield Tb3+-Activated Organic-Inorganic Hybrids for UV-Down-Shifting Green Light-Emitting Diodes

authors	Correia, SFH; Fernandes, RL; Fu, LS; Nolasco, MM; Carlos, LD; Ferreira, RAS
nationality	International
journal	EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
author keywords	Light-emitting diodes; Lanthanides; Organic-inorganic hybrid composites; Photophysics; Solid-state lighting
keywords	ENERGY-TRANSFER; PHOSPHORS; EFFICIENCY; PHOTOLUMINESCENCE; COMPLEXES; RED
abstract	Solid-state light-emitting diodes (LEDs) are driving the lighting industry towards efficient and environmentally friendly lighting and displays. Current challenges encompass efficient and low-cost down-shifting phosphors with tuned emission colors. Green light lies on the low-loss optical transmission window in plastic optical fibers and plays a special role in the regulation of the human and plant circadian rhythms. Moreover, green-emitting phosphors may suppress the green gap found in semiconductor-based LEDs. In this work, a UV-photostable green-emitting complex, Tb(NaI)(3)(H2O)(2), with NaI = nalidixic acid (1-ethyl-1,4-dihydro-7-methyl-4-oxo-1,8-naftiridine-3-carboxylic acid), was incorporated into tripodal organic-inorganic hybrid materials. The hybrid hosts boost the absolute emission quantum yield from approximate to 0.11 (isolated complex) to approximate to 0.82 (doped hybrid), which is the largest value reported for Tb3+-based hybrid phosphors. A green-emitting LED was fabricated by coating a near-UV LED (365 nm) with a Tb3+-activated organic-inorganic hybrid having pure-green-colored light with Commission International de l'Eclairage color coordinates and an efficacy value of (0.33, 0.59) and 1.3 lm W-1, respectively.
publisher	WILEY-V C H VERLAG GMBH
issn	1434-1948
isbn	1099-0682
year published	2020
volume	2020
issue	18
beginning page	1736
ending page	1742
digital object identifier (doi)	10.1002/ejic.202000054
web of science category	Chemistry, Inorganic & Nuclear
subject category	Chemistry
unique article identifier	WOS:000529234900001