| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7909326 | Optical Materials | 2015 | 5 Pages |
Abstract
A series of single-phase Na0.34Ca0.66Al1.66Si2.34O8:Ce3+, Sm3+ (NCASO) phosphors have been synthesized via a high temperature solid-state reaction method. The samples were studied based on photoluminescence (PL), photoluminescence excitation (PLE) spectra and fluorescence decay patterns. The obtained PLE exhibited a strong excitation band in the UV region between 250 and 380Â nm. Under 340Â nm excitation, NCASO:Ce3+, Sm3+ phosphor showed a broad emission band at 414Â nm of Ce3+ and four emission bands from 550Â nm to 725Â nm of Sm3+. Spectra demonstrate nonradiative energy transfers (ET) occur from Ce3+-Sm3+. The analysis based on Inokuti-Hirayama model indicates that the ET is governed by electric dipole-dipole interaction. Moreover, the emitting colors can be adjusting from blue to white by proper tuning of the relative composition of Ce3+/Sm3+. These results show that NCASO:Ce3+, Sm3+ phosphors can be used as a potential single-phased white-emitting candidate for UV WLEDs.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Lei Wang, Jie Dong, Cai'e Cui, Yue Tian, Ping Huang,