用于紫外白光发光二极管的Ca2Ga2SiO7:RE荧光粉的发光特性
Luminescence properties of Ca2 Ga2 SiO7 :RE phosphors for UV white-light-emitting diodes.
作者信息
Jiao Mengmeng, Lv Wenzhen, Lü Wei, Zhao Qi, Shao Baiqi, You Hongpeng
机构信息
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China); University of the Chinese Academy of Science, Beijing 100049 (China).
出版信息
Chemphyschem. 2015 Mar 16;16(4):817-24. doi: 10.1002/cphc.201402788. Epub 2014 Dec 21.
A series of Eu(2+) -, Ce(3+) -, and Tb(3+) -doped Ca2 Ga2 SiO7 phosphors is synthesized by using a high-temperature solid-state reaction. The powder X-ray diffraction and structure refinement data indicate that our prepared phosphors are single phased and the phosphor crystalizes in a tetrahedral system with the ${P\bar 42m}$ (113) space group. The Eu(2+) - and Ce(3+) -doped phosphors both have broad excitation bands, which match well with the UV light-emitting diodes chips. Under irradiation of λ=350 nm, Ca2 Ga2 SiO7 :Eu(2+) and Ca2 Ga2 SiO7 :Ce(3+) , Li(+) have green and blue emissions, respectively. Luminescence of Ca2 Ga2 SiO7 :Tb(3+) , Li(+) phosphor varies with the different Tb(3+) contents. The thermal stability and energy-migration mechanism of Ca2 Ga2 SiO7 :Eu(2+) are also studied. The investigation results indicate that the prepared Ca2 Ga2 SiO7 :Eu(2+) and Ca2 Ga2 SiO7 :Ce(3+) , Li(+) samples show potential as green and blue phosphors, respectively, for UV-excited white-light-emitting diodes.
采用高温固相反应法合成了一系列Eu(2+)、Ce(3+)和Tb(3+)掺杂的Ca2Ga2SiO7荧光粉。粉末X射线衍射和结构精修数据表明，我们制备的荧光粉为单相，且该荧光粉在具有P42m(113)空间群的四面体体系中结晶。Eu(2+)和Ce(3+)掺杂的荧光粉均具有较宽的激发带，与紫外发光二极管芯片匹配良好。在λ=350 nm的照射下，Ca2Ga2SiO7:Eu(2+)和Ca2Ga2SiO7:Ce(3+),Li(+)分别发出绿色和蓝色光。Ca2Ga2SiO7:Tb(3+),Li(+)荧光粉的发光随Tb(3+)含量的不同而变化。还研究了Ca2Ga2SiO7:Eu(2+)的热稳定性和能量迁移机制。研究结果表明，制备的Ca2Ga2SiO7:Eu(2+)和Ca2Ga2SiO7:Ce(3+),Li(+)样品分别显示出作为紫外激发白光发光二极管绿色和蓝色荧光粉的潜力。
Zotero 插件