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Deep red phosphors Sr A l 12 O 19 : M n 4+ , M ( M = L i + , Na + , K + , Mg 2+ ) for high colour rendering white LED s
Author(s) -
Wang Lei,
Xu Yudong,
Wang Di,
Zhou Rulong,
Ding Ning,
Shi Min,
Chen Yiqing,
Jiang Yang,
Wang Yuhua
Publication year - 2013
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201228815
Subject(s) - chromaticity , phosphor , luminescence , analytical chemistry (journal) , excited state , materials science , chemistry , mineralogy , nuclear chemistry , optics , physics , optoelectronics , atomic physics , chromatography
High‐saturated red phosphors Mn 4+ ‐doped SrAl 12 O 19 were prepared by solid‐state reaction methods. The luminescent properties of SrAl 12 O 19 :Mn 4+ were systematically investigated. The excitation spectra indicated that SrAl 12 O 19 :Mn 4+ could be effectively excited by both NUV light and the blue light of LED chips. The emission spectra exhibit two sharp peaks in the deep‐red region. The effects of codoping ions, M = Li + , Na + , K + , Mg 2+ , on the luminescent properties of SrAl 12 O 19 :Mn 4+ were investigated, respectively. The results suggested that Mg 2+ could significantly improve the luminescent properties of SrAl 12 O 19 :Mn 4+ , and the phosphor SrAl 12 O 19 :Mn 4+ ,Mg 2+ was demonstrated to be a potential candidate for high colour rendering white LEDs. CIE chromaticity diagram of different phosphors and luminescence of SrAl 12 O 19 :Mn 4+ ,Mg 2+ phosphor (a). A commercial blue LED chip coated with SrAl 12 O 19 :Mn 4+ ,Mg 2+ (b) and the luminance of SrAl 12 O 19 :Mn 4+ ,Mg 2+ excited by a 365‐nm light source (c) (×: the CIE chromaticity of a blue chip LED+ YAG:Ce coated with SrAl 12 O 19 :Mn 4+ ,Mg 2+ , 20 mA).