Full color photoluminescence of Tb3+/Sm3+ codoped oxyfluoride aluminosilicate glasses and glass ceramics for white light emitting diodes

• DOI: 10.1016/j.jallcom.2010.02.155
• Publication Date: 2010-03-04T14:56:36Z
• Authors: Zhenyu Lin; Xiaoluan Liang; Yuwen Ou; Chaxing Fan; Shuanglong Yuan; Huidan Zeng; Guorong Chen
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract A spectroscopic investigation of Tb 3+ /Sm 3+ codoped SiO 2 –Al 2 O 3 –CaO–CaF 2 glasses and glass ceramics is presented. Full color photoluminescence combining blue, green and orange-red light was realized by ultraviolet light excitation. The emission spectra showed that the intensity was enhanced with the increasing concentration of F − anions. Meanwhile, the self-quenching effect of Sm 3+ ions and an energy transfer from Tb 3+ to Sm 3+ ions were evidenced. Significantly increased luminescent intensity was observed from glasses to glass ceramics, which was attributed to the precipitation of rare-earth ions into the lower phonon energy CaF 2 crystallites.