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Dual‐Shelled RbLi(Li 3 SiO 4 ) 2 :Eu 2+ @Al 2 O 3 @ODTMS Phosphor as a Stable Green Emitter for High‐Power LED Backlights
Author(s) -
Zhao Ming,
Cao Kun,
Liu Mengjia,
Zhang Jing,
Chen Rong,
Zhang Qinyuan,
Xia Zhiguo
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202003150
Subject(s) - phosphor , materials science , luminescence , thermal stability , amorphous solid , chemical engineering , chemical stability , light emitting diode , optoelectronics , chemistry , crystallography , engineering
The stability of luminescent materials is a key factor for the practical application in white light‐emitting diodes (LEDs). Poor chemical stability of narrow‐band green‐emitting RbLi(Li 3 SiO 4 ) 2 :Eu 2+ (RLSO:Eu 2+ ) phosphor hinders their further commercialization even if they have excellent stability against thermal quenching. Herein, we propose an efficient protection scheme by combining the surface coating of amorphous Al 2 O 3 and hydrophobic modification by octadecyltrimethoxysilane (ODTMS) to construct the moisture‐resistant dual‐shelled RLSO:Eu 2+ @Al 2 O 3 @ODTMS composite. The growth mechanisms of both the Al 2 O 3 inorganic layer and the silane organic layer on the phosphor surface are investigated. The results remarkably improve the water‐stability of this narrow‐band green emitter. The evaluation of the white LED by employing this composite as the green component demonstrates that RLSO:Eu 2+ @Al 2 O 3 @ODTMS is a promising candidate for the high‐performance display backlights, and this dual‐shelled strategy provides an alternative method to improve the moisture‐resistant property of humidity‐sensitive phosphors.