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The red persistent luminescence of (Sr,Ca)AlSiN3:Eu2+ and mechanism different to SrAl2O4:Eu2+,Dy3+.
- Source :
-
Journal of Luminescence . Apr2019, Vol. 208, p313-321. 9p. - Publication Year :
- 2019
-
Abstract
- Abstract (Sr,Ca)AlSiN 3 :Eu2+ phosphors have been widely used in phosphor-converted white light emitting diodes. Herein, we reported the strong red persistent luminescence in (Sr,Ca)AlSiN 3 :Eu2+ under UV light excitation. The Sr 0.8 Ca 0.2 AlSiN 3 :0.15% Eu2+ shows the strongest red persistent luminescence with a peak emission wavelength at ~628 nm and a persistent time of ~9600 s at the 0.32 mcd/m2 threshold value. A new persistent luminescence mechanism, which is different to that of SrAl 2 O 4 :Eu2+,Dy3+, was proposed by comparing the thermoluminescence excitation spectrum (TLES) and the photoluminescence excitation spectrum (PLES) of Sr 0.8 Ca 0.2 AlSiN 3 :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)AlSiN 3 :Eu2+; while, in SrAl 2 O 4 :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)AlSiN 3 :Eu2+ were discussed. The proposed mechanism of persistent luminescence can help us to design and find new persistent luminescence materials. [ABSTRACT FROM AUTHOR]
- Subjects :
- *STRONTIUM
*CALCIUM
*PHOSPHORS
*DYSPROSIUM
*ALUMINUM compounds
Subjects
Details
- Language :
- English
- ISSN :
- 00222313
- Volume :
- 208
- Database :
- Academic Search Index
- Journal :
- Journal of Luminescence
- Publication Type :
- Academic Journal
- Accession number :
- 134378959
- Full Text :
- https://doi.org/10.1016/j.jlumin.2018.12.069