稀土离子掺杂对钨酸盐荧光粉发光性能的研究(英文)

红色荧光粉的在制备荧光转换型白光LED时是不可或缺的,因为红色荧光粉在制备高显色指数白光LED中发挥着重要的作用。LiEuW2O8是最近几年最新发展起来的一种很有潜力的红色荧光粉。主要研究了稀土离子掺杂对LiEuW2O8发光性能的影响。采用高温固相法制备钨酸锂铕系列红色荧光粉。La3+和Sm3+取代LiEuW2O8中的Eu3+,La3+和Sm3+通过再吸收的方式将能量传递给Eu3+,实现对Eu3+的敏化作用。La3+和Sm3+的掺杂并没有改变样品的激发和发射峰,也没有改变晶体结构,但是掺入后能显著提高样品的发射强度。La3+的最佳掺杂量(物质的量分数)为3%,Sm3+的最佳掺杂量为4%。

Luminescence Properties of Tungstate Phosphors Doped with Rare-Earth Ion

The preparation of red phosphor in the phosphor-converted white LED is indispensable,and plays a very important role in improving the color rendering index.As a newly developed kind of red phosphor,LiEuW2O8 shows great potential.The luminescence properties of LiEuW2O8 phosphor doped with rare-earth ions are studied.LiEu1-xRExW2O8(RE=La and Sm) series red phosphors are produced by the high-temperature solid-phase synthesis method.When La3+ and Sm3+ replace Eu3+ in LiEuW2O8,both of them transfer energy to Eu3+ through reabsorption and thus realizing sensibilization of Eu3+.After being doped with La3+ and Sm3+,the excitation and emission peaks of LiEuW2O8 and the crystal structure do not change;however,the luminescence intensity is improved.With the addition of La3+ and Sm3+ of 3% and 4%(molar fraction),respectively,the luminescence intensity reaches the maximum.