摘要
以Y2O3为原料、La2O3为烧结助剂,采用真空烧结法制备了(Y1-xLax)2O3透明陶瓷。研究了La2O3添加量对Y2O3陶瓷致密化行为的影响,确定La2O3的最佳添加量(摩尔分数)为10.0%。在此基础上制备了不同掺杂量(摩尔分数)的Eu:(Y0.9La0.1)2O3透明荧光陶瓷,研究了Eu3+掺杂浓度对陶瓷显微结构、光学性能及光谱特性的影响。结果表明:随着掺杂量的增加,Eu:(Y0.9La0.1)2O3陶瓷(1 765℃×50 h)的晶粒尺寸变化较小。其中,0.3%Eu:(Y0.9La0.1)2O3陶瓷的晶粒尺寸均匀(约为177.6μm),厚度为1 mm的陶瓷样品在800 nm处的直线透过率为62%。随着Eu3+掺杂浓度的增加,Eu:(Y0.9La0.1)2O3陶瓷的各个激发峰与发射峰强度变强。当激发波长为466 nm时,发射主峰位于红光波段611 nm处,属于Eu3+离子的5D0→7F2跃迁。研究表明Eu:(Y0.9La0.1)2O3透明陶瓷在白光发光二极管上具有潜在的应用价值。
(Y1-xLax)2O3 transparent ceramics were prepared via vacuum sintering with commercial Y2O3 as starting powders and La2O3 as a sintering aid. The influence of La2O3 addition on the densification evolution of(Y1-xLax)2O3 ceramics was investigated. The results show that the optimal La2O3 addition(in mole fraction) is 10.0%. Eu:(Y0.9La0.1)2O3 ceramics were fabricated at different Eu3+ contents. The influence of Eu3+ content on the microstructure, optical transmission and fluorescence properties was mainly investigated. The results show that the grain size of Eu:(Y0.9La0.1)2O3 transparent ceramics sintered at 1765 ℃ for 50 h varies slightly when the Eu3+ content increases. The 0.3% Eu:(Y0.9La0.1)2O3 transparent ceramic has the uniform grain size of 177.6 μm. The in-line transmittance of the ceramic sample with the thickness of 1 mm is 62% at the wavelength of 800 nm. Besides, the intensities of all excitation and emission peaks increase with the increase of Eu3+ content. When 0.3%Eu:(Y0.9La0.1)2O3 ceramic is excited at 466 nm, the major emission peak is located at the red-light wavelength of 611 nm, which attributes to the 5D0→7F2 transition of Eu3+. It is indicated that the Eu:(Y0.9La0.1)2O3 transparent ceramics could have potential applications for white light emitting diodes.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2015年第5期643-649,共7页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金重大项目(50990301)
国家自然科学基金青年基金项目(51302298)
关键词
铕掺杂氧化镧钇
透明陶瓷
白光发光二极管
显微结构
光谱性能
europium doped yttrium lanthanum oxide
transparent ceramics
white light emitting diode
microstructure
fluorescence properties
