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
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

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