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Host emission from BaMgAl 10 O 17 and SrMgAl 10 O 17 phosphor: Effects of temperature and defect level
Author(s) -
Onuma Hiroaki,
Tanno Hiroaki,
Suzuki Ai,
Sahnoun Riadh,
Koyama Michihisa,
Tsuboi Hideyuki,
Hatakeyama Nozomu,
Endou Akira,
Takaba Hiromitsu,
Carpio Carlos A.,
Kubo Momoji,
Deka Ramesh Chandra,
Kajiyama Hiroshi,
Shinoda Tsutae,
Miyamoto Akira
Publication year - 2010
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/jsid18.3.211
Subject(s) - phosphor , photoluminescence , thermoluminescence , materials science , excited state , emission spectrum , oxygen , luminescence , doping , vacancy defect , optoelectronics , spectral line , analytical chemistry (journal) , atomic physics , chemistry , physics , crystallography , organic chemistry , chromatography , astronomy
— Understanding the mechanism of blue‐light emission in Eu‐doped BAM phosphor as well as its sensitive degradation is required because this is a very important material in fluorescent lamps and plasma‐display panels. In this study, both theoretical and experimental investigations on the host emissions in BaMgAl 10 O 17 and SrMgAl 10 O 17 were performed. Host emissions from BaMgAl 10 O 17 and SrMgAl 10 O 17 by photoluminescence and thermoluminescence spectra were observed. Photoluminescence spectra suggested that the host emission from SrMgAl 10 O 17 was easily quenched by thermal vibrations. The thermoluminescence spectra showed the existence of shallow and deep defect levels in BaMgAl 10 O 17 and SrMgAl 10 O 17 phosphors. It was shown that SrMgAl 10 O 17 and its conduction plane could undergo degradation during irradiation of vacuum‐ultra‐violet (VUV) lights based on the calculated energy of formation of an oxygen vacancy. Moreover, the structural defects, such as oxygen vacancies, would cause localizing levels in the upper level in the valence band and in theconduction band. The results suggest the contribution of the host emission to the energy transfer to the Eu atoms would not be significant and the oxygen vacancies would act as the traps for excited carriers.