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Partial cation substitution of tunable blue‐cyan‐emitting Ba 2 B 2 O 5 :Ce 3+ for near‐UV white LEDs
Author(s) -
Bai Qiongyu,
Zhao Suling,
Xu Zheng,
Li Panlai
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16501
Subject(s) - phosphor , cyan , analytical chemistry (journal) , ion , thermal stability , chemistry , blueshift , band gap , light emitting diode , crystal (programming language) , materials science , photoluminescence , optics , optoelectronics , physics , organic chemistry , chromatography , computer science , programming language
In this study, Sr 2+ , Ca 2+ , Zn 2+ , and Mg 2+ ions act to tune the emission band to the blue‐cyan region in Ba x Sr y B 2 O 5 :Ce 3+ (BSBO), Ba x Ca z B 2 O 5 :Ce 3+ (BCBO), Ba x Zn u B 2 O 5 :Ce 3+ (BZBO), and Ba x Mg v B 2 O 5 :Ce 3+ (BMBO) phosphors. A red shift occurs with the increase of Sr 2+ , Ca 2+ , Zn 2+ , and Mg 2+ concentration, and a blue shift occurs when the concentrations of Sr 2+ , Ca 2+ , Zn 2+ , and Mg 2+ exceed the critical value. The emission color can be tuned from deep blue (0.15, 0.12) to cyan (0.16, 0.27) upon 365 nm UV lamp excitation due to the crystal field splitting and centroid shifts. The excitation band shift to long wavelength by introducing ions, so that the synthesized phosphor can be better matched with the n‐UV chip. The emission intensity slowly decreases with the temperature increasing. Therefore, the BMBO:Ce 3+ , BZBO:Ce 3+ , BCBO:Ce 3+ , and BSBO:Ce 3+ phosphors with relatively good thermal stability were synthesized, which could have potential applications in the n‐UV white LEDs.