LED用红色荧光粉NaGdTiO_4∶Sm^(3+)的合成与发光性能

Synthesis and Photoluminescence Properties of Red Phosphor NaGdTiO_4∶ Sm^(3+) for LED

采用高温固相法制备了白光LED用NaGd(1-x)TiO4∶xSm3+系列红色荧光粉,并对样品分别进行了X射线衍射分析和荧光光谱测试。结果表明,样品可以被紫外、近紫外和蓝光有效激发,在409nm激发下,该荧光粉有三个主要发射峰,位于567nm、607nm和652nm处,分别对应于Sm3+的4G5/2→6H5/2、4G5/2→6H7/2、4G5/2→6H9/2的跃迁发射,其中607nm处发射最强,呈现红色发光。当Sm3+的掺杂浓度为2.5mol%时,达到最佳的发光效果。因此,这种荧光粉是一种有应用潜力的白光LED红色荧光粉。

A series of NaGdTiO4∶ Sm3＋ phosphor was synthesized by solid state method. The crystal structure and luminescence properties of NaGdTiO4∶ Sm3 ＋phosphor were investigated by XRD and fluorescence spectra. The result indicate that as-prepared samples can be effectively excited by the UV,near UV and blue light,and it has three main emission peaks which located at 567 nm,607 nm and 652 nm excited by 409 nm,originating from typical4G5 /2→6H5 /2,4G5 /2→6H7 /2and4G5 /2→6H9 /2transitions,respectively. The strongest emission occurs at 607 nm which is red color. The optimum concentration of Sm3＋ in NaGdTiO4∶ Sm3 ＋phosphor is 2.5mol%. Therefore,the NaGdTiO4∶ Sm3＋ is a promising phosphor for LED.