LED用CaMoO_4:Eu3^(+),Tb^(3+)白光荧光粉的制备及发光性质的研究

Preparation and Luminescent Properties of CaMoO_4: Eu^(3+),Tb^(3+) Phosphor for White LED

采用化学共沉淀法制备了荧光粉Ca Mo O4:Tb3+、Ca Mo O4:Eu3+,Tb3+,并对其发光性质进行了研究.Ca Mo O4:Tb3+样品在488nm激发下能发出很强的绿光,此时Tb3+的最佳掺杂浓度为15%;在Eu3+和Tb3+共同掺杂的体系中,可以观察到由于Tb3+向Eu3+的能量传递使Tb3+敏化Eu3+的发光现象.该荧光粉在近紫外光(379nm)激发下发出较强的白色荧光,光谱测试显示Ca Mo O4:Eu3+,Tb3+的发射光谱存在三个激发峰,分别位于488、543和613 nm处,能够合成较理想的白光.

In this paper, CaMoO4： Tb3＋ and CaMoO4： Eu3＋, Tb3＋ phosphors were prepared bychemical copreeipitation , and luminescent properties were studied. CaMoO4 ： Tb3＋ samples can emit stronggreen light under 488nm excitation, and the optimum doping concentration of Tb3＋ is 15%. In Eu3＋ andTb3 ＋ co - doped system, it can be observed that Tb3 ＋ enhanced luminescence of Eu3 ＋ due to energy transferfrom Tb3＋ to Eu3＋. The phosphor emitted a strong white fluorescence under the near UV （379nm）excitation. The emission spectra show there are three emission peaks in CaMoO4： Eu3＋, Tb3＋ emissionspectra, located respectively at 488,543 and 613nm and as can be desirable white light.