红色发光粉Li_2MSiO_4∶Eu^(3+)(M=Ba,Sr)的合成与光谱性能

Synthesis and spectral property of Li_2MSiO_4∶Eu^(3+)(M=Ba,Sr)red phosphor

采用凝胶-燃烧法制备Li2MSiO4∶Eu3+(M=Ba,Sr)红色荧光粉。该荧光粉为六方晶系结构。以395nm的近紫外光激发样品,Li2MSiO4∶Eu3+荧光粉发红光。当Eu3+掺杂摩尔分数x在0.05~0.4的范围内时,随Eu3+浓度的增加,发光强度增加,当x=0.3时达到最大值,x继续增加时,出现浓度猝灭现象。Li2Ba0.7SiO4∶0.3Eu3+比Li2Sr0.7SiO4∶0.3Eu3+发光亮度提高20%。该荧光粉能够有效吸收395nm附近的近紫外光,适合做350~410nm InGaN管芯激发的白光LED用红色荧光粉。

A series of Lie2MSiO4 ： Eu3＋ （M= Ba, Sr） red phosphors were synthesized by gel-burning method. The phosphors had hexagonal crystal structure. When excited by 395nm in NUV region, the phosphors emitted red light. The mole fraction（x） of Eua＋ ions ranged from 0.05 to 0. 4. In this range, the luminescent intensity of Li2 MSiO4 ： Eu3＋ increas- esd with the increasing of Eua＋ concentration and reached the maximum when x equalled to 0. 3. The concentration quench- ing, however, oeeured if the concentration of Eua＋ ions increased continually. The luminescent intensity of Li2 Ba0 7 SiO4 ：0. 3Eu3＋ increased by 20 percent when compared with that of Li2 Sr0. 7 SiO4 ： 0. 3Eu3＋. The Li2 MSiO4 ： Eu3＋ phosphors can effectively absorb near-UV light around 395nm and be potential to be used as red phosphor for white LED excited by 350~ 410nm InGaN chip.