SrAl_2O_4:Eu荧光粉的光致发光及其CIE色度调控

Control of CIE chromaticity and photoluminescence of SrAl_2O_4:Eu phosphors

以尿素为燃料和还原剂,采用溶液-燃烧合成法制备了不同掺杂浓度的Sr_(1-x)Al_2O_4:xEu荧光粉末样品,研究了不同浓度样品的光致荧光发射效应和CIE色度特性.X射线衍射(XRD)表征结果显示,所制备的样品呈现单斜α-SrAl_2O_4晶体结构.在394nm激发光作用下,随着Eu离子掺杂浓度的增加,样品500nm附近的绿色荧光发射逐渐增强,在5.0mol%时达到最大而后减弱,而610nm附近的红色荧光发射逐渐增强,CIE色度图显示样品的荧光色调从蓝绿区域经绿色白色区域逐步过渡到了淡红色区域.

SrAl2O4:Eu phosphors with various doping concentration were synthesized via a urea assisted solution-combustion method.The phosphors were characterized by X-ray powder diffraction(XRD)and photoluminescence spectroscopy.The XRD showed that the synthesized samples exhibited a monoclinicα-SrAl2O4 phase.Under the excitation at 394 nm,the intensity of green fluorescence emission around 500 nm increases with increasing Eu concentration up to a maximum of 5.0 mol%,then decreased due to concentration quenching effect,while the intensity of red fluorescence around 610 nm increases with increasing Eu concentration.The CIE chromatogram shows that the fluorescence of the sample gradually transits from the white region to the pink region through the green region.