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Next‐Generation Narrow‐Band Green‐Emitting RbLi(Li 3 SiO 4 ) 2 :Eu 2+ Phosphor for Backlight Display Application
Author(s) -
Zhao Ming,
Liao Hongxu,
Ning Lixin,
Zhang Qinyuan,
Liu Quanlin,
Xia Zhiguo
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201802489
Subject(s) - backlight , phosphor , materials science , gamut , luminous efficacy , light emitting diode , luminescence , optoelectronics , liquid crystal display , optics , common emitter , thermal stability , nanotechnology , physics , layer (electronics) , quantum mechanics
The discovery of high efficiency narrow‐band green‐emitting phosphors is a major challenge in backlighting light‐emitting diodes (LEDs). Benefitting from highly condensed and rigid framework structure of UCr 4 C 4 ‐type compounds, a next‐generation narrow green emitter, RbLi(Li 3 SiO 4 ) 2 :Eu 2+ (RLSO:Eu 2+ ), has emerged in the oxide‐based family with superior luminescence properties. RLSO:Eu 2+ phosphor can be efficiently excited by GaN‐based blue LEDs, and shows green emission at 530 nm with a narrow full width at half maximum of 42 nm, and very low thermal quenching (103%@150 °C of the integrated emission intensity at 20 °C), however its chemical stability needs to be improved later. The white LED backlight using optimized RLSO:8%Eu 2+ phosphor demonstrates a high luminous efficacy of 97.28 lm W −1 and a wide color gamut (107% National Television System Committee standard (NTSC) in Commission Internationale de L'Eclairage (CIE) 1931 color space), suggesting its great potential for industrial applications as liquid crystal display (LCD) backlighting.