ZnGa_2O_4:Eu^(3+)红色荧光粉的光致及电致发光性能

Photoluminescent and Electroluminescent Properties of ZnGa_2O_4:Eu^(3+) Red Phosphor

采用柠檬酸溶胶-凝胶法合成了ZnGa2O4:Eu3+红色荧光粉,利用XRD、SEM、PL和EL光谱手段,表征了样品的结构、形貌和发光性能.结果表明:Eu3+的掺杂浓度是6at%,在空气气氛中800℃热处理5h即可获得结晶性好的ZnGa2O4单相;SEM结果表明粉末样品颗粒形状不规则,粒径大小在30～50nm之间;PL和EL光谱图显示两者发光机制的本质相同,最强峰位于613nm处,属于红光发射,是5D0→7F2电偶极跃迁发射所致.

ZnGa2O4：Eu3＋ red phosphors were synthesized by citrate sol-gel process. XRD,SEM,PL and EL spectra were used to characterize the structure,shape and luminescent property of the powders. The results show that pure ZnGa2O4 phase was obtained in the samples sintered at 800 ℃ for 5 h in air ambient. The SEM result illustrates the particles were irregularly shaped and particle size ranged from 30 to 50 nm. PL and EL spectra results show that photoluminescence mechanism of the phosphor was consistent with electroluminescence mechanism of the device. And the emission of Eu3＋ at 613 nm is originated from the transition of 5D0→7F2.