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OALib Journal期刊
ISSN: 2333-9721
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eyto粉末的光致发光特性
Keywords: 无机非金属材料,(er,y)_2ti_2o_7
Abstract:
？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112nm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20.9ms.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.
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