摘要
以柠檬酸为络合剂、钛酸丁酯为前驱体,制备了Er^(3+)掺杂浓度(摩尔分数)为0.1%-5.0%的(Er,Y)_2Ti_2O_7 (EYTO)粉末.在700℃烧结EYTO粉末中EYTO相的晶化不完全,随着烧结温度的升高晶化程度显著提高,-OH基团的含量逐渐减少;在1000℃烧结,得到结晶完全且不含-OH基团的EYTO相.不完全晶化的EYTO相的PL谱为半高宽112 nm的单一宽峰,结晶完全的EYTO相其PL谱为发生Stark分裂的分立发光峰.随着烧结温度的升高EYTO粉末的PL强度和荧光寿命连续提高,归因于粉末中-OH基团的逐步脱除和EYTO相晶化程度的提高;Er^(3+)浓度在0.1%-1.5%区间均呈现上升趋势,源于EYTO相为Er^(3+)提供了均匀分散;Er^(3+)浓度为1.5%时均达到最大值、荧光寿命为20.9 ms.当Er^(3+)浓度超过1.5%时,Er^(3+)-Er^(3+)间的交互作用增强导致1.53μm的PL强度和荧光寿命持续下降.
The （Er,Y）2Ti2O7 （EYTO） powders with the Er^3＋ doping concentrations （mol fraction） of 0.1%-5.0% have been prepared at the sintering temperature of 700-1000 ℃ by using citric acid as chelator and tetrabutyltitanate precursor. The crystallization of EYTO phase was poor at the sintering temperature of 700 ℃, and greatly improved by increasing the sintering temperature, with the content of hydroxyl group in the EYTO powders gradually decreasing. Up to 1000 ℃, there was a perfect crystalline EYTO phase without -OH group. A broadband PL spectrum with the full width at half maximum of a single peak about 112 nm was observed for the poor crystalline EYTO phase, and the multi-peak PL spectra derived from Stark splitting were for the perfect crystalline phase. The PL intensity and fluorescence lifetime of the EYTO powders monotonically increased with increasing the sintering temperature, due to the gradual removal of hydroxyl group in powders and the improving crystallization of EYTO phase. Under the condition of 1000 ℃, both the PL intensity and fluorescence lifetime, which presented increased trend attributed to the homodispersion provided by EYTO phase with Er^3＋ doping concentrations of 0.1%-1.5%, simultaneously reached the maximums with the maximal lifetime of 20.9 ms at Er^3＋ doping concentration of 1.5%, and then presented reductive trend caused by the enhanced interaction between Er^3＋-Er^3＋ as Er^3＋ doping concentration exceeded 1.5%.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2007年第6期637-642,共6页
Chinese Journal of Materials Research
基金
教育部科学研究重点01052资助项目~~
