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用沉淀法制备(Eu_(0.045)Li_(3x)Lu_y)_2O_3纳米晶,通过测量样品的X射线衍射谱、傅里叶红外光谱、扫描电子显微镜图像和透射电子显微镜图像分析其微观结构与形貌,测量样品的激发谱、发射谱及发光衰减曲线来分析发光特性。研究合成条件中沉淀剂、助熔剂、温度、退火条件等因素对(Eu_(0.045)Li_(3x)Lu_y)_2O_3纳米晶微结构、发光特性、荧光衰减及能级寿命的影响。实验表明,氨水沉淀下,合成前驱粉中加入碳酸锂,1000℃活性炭中退火获得的(Eu_(0.045)Li_3x=0.015)Lu_(y=0.94))_2O_3纳米晶,比相同条件不加碳酸锂的样品发光强度提高约2倍;比800℃空气中退火的(Eu_(0.045)Lu_(0.955))_2O_3纳米晶发光强度提高约4倍。
The nanocrystal of (Eu_ (0.045) Li_ (3x) Lu_y) _2O_3 was prepared by precipitation method. The microstructure and morphology of the nanocrystal were analyzed by XRD, FT-IR, SEM and TEM The excitation spectrum, emission spectrum and luminescence decay curve were measured to analyze the luminescence properties. The effects of precipitant, flux, temperature and annealing conditions on the microstructure, luminescent properties, fluorescence decay and energy level lifetimes of (Eu_ (0.045) Li_ (3x) Lu_y) _2O_3 nanocrystals were investigated. The experimental results show that (Eu_ (0.045) Li_3x = 0.015) Lu_ (y = 0.94) _2O_3 nanocrystals obtained by adding lithium carbonate and 1000 ℃ activated carbon annealed under the condition of ammonia precipitation are more stable than the same conditions without adding lithium carbonate The luminescence intensity of the sample increased by about 2 times. The luminescence intensity of Eu_ (0.045) Lu_ (0.955) _203 nanocrystals annealed in air at 800 ℃ increased about 4 times.