Eu_2Mo_4O_(15)∶Gd^(3+)在465nm蓝光激发下的红色发光

Red Emission of Eu_2Mo_4O_(15)∶Gd^(3+) under 465nm Excitation and Its Thermal Stability

采用简单的沉淀法制备了白光LED用Eu_2Mo_4O_(15)∶x%Gd^(3+)(x=0,20,40,60)系列荧光粉。在465 nm蓝光激发下,该荧光粉发射强的红光,而且发射强度与Gd^(3+)的掺杂浓度密切相关。当Gd^(3+)浓度为40%时,激发效率和发光效率最大。热特性的研究表明,40%Gd^(3+)掺杂样品的热猝灭激活能约为0.55 eV。~5D_0和~5D_1到电荷迁移带(CTB)的热激发是导致发光热猝灭的主要因素。

In this paper,Eu2Mo4O（15）∶ x% Gd^3＋ （ x = 0,20,40,60） phosphors for white LEDs were prepared by a simple precipitation method. Under 465 nm excitation,the phosphor produces strong red emission,and the intensity is closely related to the doping concentration of Gd^3＋ . When the concentration of Gd^3＋ is 40%,the excitation efficiency and luminous efficiency are maximized. The studies on thermal properties have shown that for the 40% Gd^3＋ doped sample,the activation energy for the thermal quenching process is about 0. 55 eV. The thermal excitation of ^5D0 and ^5D1 to charge transition band（ CTB） is responsible for the thermal quenching of luminescence.