期刊
JOURNAL OF LUMINESCENCE
卷 208, 期 -, 页码 313-321出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2018.12.069
关键词
Persistent luminescence; (Sr,Ca)AlSiN3:Eu; Red emission; Persistent luminescence mechanism; SrAl2O4:Eu,Dy
类别
资金
- National Natural Science Foundation of China [51672027, 51832005]
- Fundamental Research Funds for the Central Universities [FRF-TP-17-005A2]
(Sr,Ca)AlSiN3:Eu2+ phosphors have been widely used in phosphor-converted white light emitting diodes. Herein, we reported the strong red persistent luminescence in (Sr,Ca)AlSiN3:Eu2+ under UV light excitation. The Sr0.8Ca0.2AlSiN3:0.15% Eu2+ shows the strongest red persistent luminescence with a peak emission wavelength at similar to 628 nm and a persistent time of similar to 9600 s at the 0.32 mcd/m(2) threshold value. A new persistent luminescence mechanism, which is different to that of SrAl2O4:Eu2+,Dy3+, was proposed by comparing the thermoluminescence excitation spectrum (TLES) and the photoluminescence excitation spectrum (PLES) of Sr0.8Ca0.2AlSiN3:0.15% Eu2+. The electrons are directly excited from 4f ground states to the conduction band or from valence band to conduction band in (Sr,Ca)AlSiN3:Eu2+; while, in SrAl2O4:Eu2+,Dy3+, they are first excited to 5d level and then stimulated thermal process to the conduction band. The effect of Eu2+ concentration on red persistent luminescence in (Sr,Ca)AlSiN3:Eu2+ were discussed. The proposed mechanism of persistent luminescence can help us to design and find new persistent luminescence materials.
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