硅酸盐单基质白光LED荧光体的制备和光谱性质(英文)  

Preparation of Single Host Silicate Phosphors for White LEDs and Its Photoluminescent Properties

作　　者：王继磊[1] 王达健[1] 李岚[1] 蒙延双[2] 张纳[1] 李光 

机构地区：[1]天津理工大学材料物理研究所,天津300191 [2]昆明理工大学材料与冶金工程学院,云南昆明650093

出　　处：《发光学报》2006年第4期463-468,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金(50364002);天津市自然科学基金(06YFJMJC02300)资助项目~~

摘　　要：用喷雾热解溶胶凝胶方法制备了平均粒径为4.45μm大小的同一基质Ba3MgS i2O8∶Eu2+,Mn2+三色发射合成白光的LED荧光体,研究了掺杂铝离子对荧光体的微结构和发射光谱的影响。实验发现,在375 nm的激发下,红绿蓝(RGB)三种颜色峰的位置分别是608,500,437 nm。微量A l离子的掺入会使荧光粉蓝光和绿光的相对强度发生明显变化,而红光的强度基本不变。因此,荧光体的色坐标位置可以通过掺入不同数量的铝离子来调控。从微结构机制上讨论了铝离子对基质离子的配位、格位和能量状况、发射光谱影响的内在规律。该稀土硅酸盐基质表现出的RGB三色发射特征,可成为重要的新型白光荧光体材料。The spray pyrolysis process was employed to synthesize the single host silicate phosphor, Ba3MgSi2O8： Eu^2 ＋, Mn^2 ＋. It was found experimentally that, its three-colour emission peaks situated at 608,500 and 437 nm respectively under excitation of 375 nm irradiation. The phosphor particle is in the size of around 4.5 μm. The effects of Al addition to thehost on the microstructure and emission spectroscopy were investigated in details. The addition of Al ion to the host leads to a substantial change of intensity ratio between blue to green emission while the intensity of red-emission remains unchanged. Consequently, the parameters related to the white emission such as CIE coordinate, colour temperature can be adjusted by changing the amount of Al addition. Based on the modification of host microstructure of the silicate, the intrinsic effects of Al addition on the coordination number, ionic occupation and energy transfer were discussed. Theoretically, it has been well established, from classical silicate science, that the modification of the tetrahedral microstructure of Si-O by Al-ion addition could result in a great change of the properties （ i. e. PL in our case） of the silicate host. There is some disputation, however, of whether the charge compensation or atomic configuration plays a key role to change the priority of the lattice occupation, crystal field around the different cations. The experimental facts in this work greatly support the fact that the impact of Eu ions situated at different lattices of Ba ions on the emission spectroscopy due to the disturbance of Al ion to the silicate network. Hence, this three-colour emission feature of this cost-effective silicate phosphor may become one of the important candidates for future high luminous efficiency white LEDs applications.

关 键 词：硅酸盐荧光体 拟薄水铝石 喷雾热解 白光LED 

分 类 号：O482.31[理学—固体物理]