摘要
高温熔制Er3+,Yb3+离子掺杂CaO-Y2O3-Al2O3-SiO2系统玻璃,并进行微晶化处理,研究了微晶玻璃中Er3+离子的发光及上转换发光特性,分析了微晶玻璃上转换发光机理.结果表明:原始玻璃经热处理得到了Er,Yb:YAG微晶玻璃,微晶玻璃中Er3+离子在室温下4I13/2→4I15/2跃迁产生横盖1450—1650nm区间的超宽带荧光,荧光半高宽达180nm,这可能由于YAG微晶相中Er3+离子与玻璃相中残留Er3+离子的共同发光;Er3+与Yb3+离子局域基质声子能量的降低使微晶玻璃Er3+离子上转换发光强度与原始玻璃相比显著提高,绿光、红光上转换荧光强度比玻璃样品分别增强约7和3倍;微晶化后Er3+,Yb3+离子局域环境发生变化也导致微晶玻璃中Er3+离子绿光、红光上转换发光相对强度发生变化.
The Er^3＋ , Yb^3＋ -doped CaO-Y2O3-AI2O3-SiO2 glasses were prepared by melting, and then annealed. The emission spectra and upconversion spectra of glass-ceramics have been investigated. The upconversion lmechanisms of Er^3＋ in YAG glass-ceramics were analyzed. The results show that the Er,Yb-YAG glass-ceramics are obtained after annealing of the glasses. A broad emission spectrum of width 20Ohm in the wavelength range of 1450-1650 nm was obtained in Er, Yb： YAG glass- ceramics at room temperature. The full width at half-maximum （FWHM） of the 4I13/2→4I15/2 transition is - 180 nm. This may be as a result of the luminescence of the Er^3 ＋ ions in YAG crystal phase and the remnant Er^3＋~ ions in glass phase acting together. The upconversion luminescence intensity increases because the phonon energy of YAG crystallite is lower than that of aluminosilicate glass. The infrared to green or to red upconversion luminescence intensities for the glass-ceramics are evaluated to be nearly 7 or 3 times as high as that of aluminosilicate glasses, respectively. The relative intensities of green and red upconversion emission changed because the microscopic environment around Er^3＋ and Yb^3＋ ions changed upon heat treatment.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第7期4207-4212,共6页
Acta Physica Sinica
基金
浙江省自然科学基金(批准号:Y106394)
宁波市博士基金(批准号:2005A610023
2005A610010)
浙江省教育厅科研项目(批准号:20051747)资助的课题.~~
