Premium
Electronic Structure and Luminescence Properties of Phosphor Li 8 Bi 2 ( MoO 4 ) 7 : Dy 3+
Author(s) -
Zhao Jin,
Guo Chongfeng,
Su Xiangying,
Noh Hyeon Mi,
Jeong Jung Hyun
Publication year - 2014
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.12863
Subject(s) - phosphor , photoluminescence , luminescence , doping , analytical chemistry (journal) , excited state , band gap , valence (chemistry) , ion , crystal structure , materials science , chemistry , optoelectronics , crystallography , physics , atomic physics , organic chemistry , chromatography
Dy 3+ ‐doped Li 8 Bi 2 ( MoO 4 ) 7 (LBM: Dy 3+ ) white‐emitting phosphors have been prepared by sol‐gel method at about 400~550°C low temperature. The electronic structure of Li 8 Bi 2 ( MoO 4 ) 7 is also calculated using density functional theory. The calculation results show that Li 8 Bi 2 ( MoO 4 ) 7 has a direct band gap with 2.63 eV , the top of the valence band and the bottom of the conduction band are dominated by O 2 p and Mo 4 d , respectively. The effect from Bi 3+ ions is so weak that it could be neglected, which is also be proved by the experimental results. The crystal structure and luminescent properties of the obtained phosphors are characterized by powder X‐ray diffraction and photoluminescence spectrum, respectively. Photoluminescence results showed that the obtained phosphors can be excited efficiently by near‐UV 387 nm and generated white light emission. The yellow/blue ratio and Commission International de I'Eclairage color coordinates could be tuned by adjusting the concentration of Dy 3+ . Results demonstrated that Li 8 Bi 2 ( MoO 4 ) 7 : Dy 3+ was a potential white light‐emitting phosphor candidate for NUV‐based w‐LEDs.