Ce^(3+)掺杂及晶场对Ca_(10)K(PO_(4))_(7):Eu^(2+),Mn^(2+)荧光粉发光性能的调控  

Controllable luminescence properties of Ca_(10)K(PO_(4))_(7):Eu^(2+),Mn^(2+) phosphor via codoping Ce^(3+)and crystal field regulation

作　　者：唐万军[1] 刘芸伶 杨珍[1] 谢光勇[1] TANG Wanjun;LIU Yunling;YANG Zhen;XIE Guangyong(College of Chemistry and Material Science,South-Central Minzu University,Wuhan 430074,China;College of Science,Huazhong Agricultural University,Wuhan 430074,China)

机构地区：[1]中南民族大学化学与材料科学学院,武汉430074 [2]华中农业大学理学院,武汉430070

出　　处：《中南民族大学学报（自然科学版）》2023年第1期13-17,共5页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金资助项目(21172269);中央高校基本科研业务费专项资金资助项目(CZY22010)。

摘　　要：采用高温固相反应法合成了Ca_(10)K(PO_(4))_(7):Eu^(2+)荧光粉,分别通过Sr部分取代Ca、Ce^(3+)掺杂及Mn^(2+)共掺杂,探讨了晶场调控、Ce^(3+)→Eu^(2+)能量传递及Eu^(2+)→Mn^(2+)能量传递对该体系发光性能的影响规律.XRD测定结果表明,Sr取代Ca对Ca_(10)K(PO_(4))_(7)基质晶格结构无明显影响.光谱测定结果表明:制备得到的Ca_(10)K(PO_(4))_(7):Eu^(2+)荧光粉中,Eu^(2+)和Eu^(3+)共存.掺杂Ce^(3+)有助于Eu^(3+)还原为Eu^(2+),大幅度地提高了荧光粉的发光强度.Sr取代Ca可调控晶体场强度,促使Eu^(2+)发光光谱红移.共掺杂Mn^(2+),通过Eu^(2+)→Mn^(2+)能量传递过程实现了蓝绿色和红色双波长发射.在Grassman色度相加原理的基础上,精确调控Sr取代量和Mn^(2+)含量得到了组成为Ca_(8.8)Sr_(1.2)K(PO_(4))_(7):0.1Eu^(2+),0.2Ce^(3+),0.1Mn^(2+)的荧光粉;在紫外光激发下,该荧光粉可发出理想的白光.这为Eu激活荧光粉中Eu离子价态控制及发光颜色的调控提供了新思路.Ca_(10)K(PO_(4))_(7):Eu^(2+)phosphors were prepared via the high-temperature solid-state reaction method.The effects of crystal field regulation,Ce^(3+)→Eu^(2+)energy transfer and Eu^(2+)→Mn^(2+)energy transfer on the luminescence properties of the system were investigated by partial substitution of Ca with Sr,by Ce^(3+)doping and Mn^(2+)co-doping,respectively.XRD results showed that the lattice structure of Ca_(10)K(PO_(4))_(7) was not significantly affected by Sr substitution of Ca.Spectral analysis indicated that Eu^(2+)/Eu^(3+)coexisted in the Ca_(10)K(PO_(4))_(7):Eu^(2+)phosphors.Doping of Ce^(3+)facilitated the reduction of Eu^(3+)to Eu^(2+),thus greatly increased the luminescence intensity of phosphors.Sr substitution for Ca could regulate the intensity of the crystal field and promote the red shift of the Eu^(2+)spectrum.Blue-green and red dual-wavelength emission could be realized by co-doped Mn^(2+)through the energy transfer of Eu^(2+)→Mn^(2+).A phosphor with the composition of Ca_(8.8)Sr_(1.2)K(PO_(4))_(7):0.1Eu^(2+),0.2Ce^(3+),0.1Mn^(2+),which emitted ideal white light under near UV excitation,was obtained by precisely controlling Sr substitution and Mn^(2+)content,based on the Grassman's law of color mixing.This presented a new strategy for the regulation of the valence state of Eu ions and control of the luminescence color in Eu-activated phosphors.

关 键 词：发光 共掺杂 荧光粉 晶场调控 能量传递 

分 类 号：O643.36[理学—物理化学]