白光LED用卤化钙和氧化钙基双掺杂发光材料的能量传递与光谱调控研究

项目名称： 白光LED用卤化钙和氧化钙基双掺杂发光材料的能量传递与光谱调控研究

项目编号： No.11274007

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 郝振东

作者单位： 中国科学院长春光学精密机械与物理研究所

项目金额： 93万元

中文摘要： 为探索近紫外基白光LED用发光新材料，本项目开展了Eu-Mn能量传递的研究，获得了高亮度蓝、红双色发光的CaCl2:Eu,Mn。还将材料应用目标扩展至蓝光基白光LED，制备出黄色发光材料CaO:Ce，其红光成分比YAG:Ce多，有利于获得低色温白光。上述材料经Nano-SiO2包覆，克服了易潮解的问题，并呈现出比商用YAG:Ce弱的热猝灭特性。为获得高品质白光，材料光谱特性还需进一步调控和改进。研究表明，CaCl2:Eu,Mn的蓝、红光波长偏短；CaO:Ce的红光成分还不足以合成人们更喜欢的暖白光。下一步研究拟选择CaBr2和CaI2取代CaCl2基质，利用电子云重排效应使能级重心降低,实现蓝、红光波长红移；基于前期能量传递的研究结果，在CaO:Ce中引入红色发光中心Mn，旨在进一步增强红光成分,为获得高显色性、暖白光LED提供新型发光材料设计的物理基础。

中文关键词： 氧化钙；能量传递；Ce-Mn；白光LED；单一基质

英文摘要： To explore new luminescent material for near-ultraviolet-based white LEDs, the study on energy transfer of Eu-Mn has been carried out in this project. A high brightness material of CaCl2:Eu, Mn with blue and red dual color emission is obtained. Considering to extend the application area of new material to blue light-based white LEDs, a yellow light-emitting material CaO:Ce is prepared. It has richer red ingredient than YAG:Ce, which is favor of the white light with low color temperature. The hygroscopic of the above-mentioned materials is overcome by Nano-SiO2 coating. The coated materials show weaker thermal quenching characteristics than the commercial YAG:Ce. However, it is shown that the blue and red wavelength in CaCl2:Eu, Mn are shorter than the standard value, and the red ingredient in CaO:Ce is not rich enough to obtain the warm white light that most people prefer. Therefore, in order to obtain high-quality white light, the spectral characteristics need to be further manipulated and improved. Next, we intend to select CaBr2 and CaI2 to replace CaCl2 host. Utilizing the rearrangement of the electron cloud effect, the level center of gravity can be lowered in CaBr2 and CaI2 than in CaCl2, making the blue and red emission redshift and approach to the standard value to fabricate high quality white light. Ba

英文关键词： Calcium oxides；energy transfer；Ce-Mn；white-LEDs；single-matrix