摘要
以金属硝酸盐为反应原料 ,分别采用柠檬酸 凝胶法、共沉淀法和固相法制备了YAG和YAG∶RE3+ (RE =Eu ,Dy) (1% ,摩尔分数 )发光粉 ,并通过XRD ,TG DTA和发光光谱对样品进行了表征。柠檬酸 凝胶法、共沉淀法和固相法制备的YAG和YAG∶Eu的晶相形成温度分别是 80 0和 90 0℃。Eu3+ 在非晶态和晶态YAG中其激发和发射光谱有明显差异 ,在一定温度范围内 ,发光强度随烧结温度的升高而增强。由于碳杂质的存在 ,90 0和 10 0 0℃下柠檬酸 凝胶法制备样品的发射强度较其他两种方法低。
Y 3Al 5O 12 (YAG) and YAG∶RE 3+ (RE=Eu, Dy) (1%, molar fraction) powder phosphors were prepared by citrate gel (CG), coprecipitation (CP) and solid state (SS) methods, respectively. Using metal nitrates as starting materials, the formation of YAG and YAG∶Eu was investigated by means of XRD and TG DTA. The purified crystalline phases of YAG were obtained at 800 (CG) and 900 ℃ (CP, SS), respectively. The differences for the excitation and emission spectra of Eu 3+ and Dy 3+ in crystalline and amorphous states of YAG were observed, and the emission intensities increased with the increasing of sintering temperature. At the same sintered temperature, the emission intensities of samples prepared by three kinds of methods were compared. For all the rare earth ions above, the CG samples present the lowest intensity at 900 and 1000 ℃ because of the carbon impurity inside.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2001年第6期575-578,共4页
Journal of the Chinese Society of Rare Earths
基金
中国科学院"百人计划"资助项目
吉林省杰出青年基金
国家教育部留学回国人员启动基金资助项目
