| Autor: |
Du, Fu, Zhuang, Weidong, Liu, Ronghui, Liu, Yuanhong, Gao, Wei, Zhang, Xia, Xue, Yuan, Hao, Hongrui |
| Zdroj: |
Journal of Rare Earths; November 2017, Vol. 35 Issue: 11 p1059-1064, 6p |
| Abstrakt: |
A series of high phase purity blue light excitable yellow-emitting La3−xSi6N11:xCe3+phosphors were synthesized by the high temperature solid state reactions method. The structure and luminescent properties were investigated. The phase structure was studied by means of X-ray diffraction, structures refinements and energy dispersive X-ray spectroscopy. The phosphors effectively excited by the light of 450 nm and show intense yellow emission at 535 nm with FWHM of 115 nm corresponding to the 5d → 2F5/2and 5d → 2F7/2transitions of Ce3+. In addition, the optimized La2.86Si6N11:0.14Ce3+exhibits a weak thermal quenching, which remains 98.2% of the initial emission intensity when heated to 200 °C, the thermal quenching properties exhibit a modest decline when the temperature returned to room temperature. The above results indicate that La3Si6N11:Ce3+can be regarded as a high promising phosphor for applications in high power white-light LED. |
| Databáze: |
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