稀土离子掺杂LaAlO_3:RE(RE=Dy^(3+),Ho^(3+),Er^(3+))荧光粉的发光性能

Luminescent properties of rare earth ions doped LaAlO_3:RE(RE=Dy^(3+),Ho^(3+),Er^(3+))phosphors

采用溶胶凝胶法合成La_(1-x)AlO_3:xRE(RE=Dy^(3+),Ho^(3+),Er^(3+))荧光粉,对样品进行X射线粉末衍射(XRD)、透射电镜(TEM)以及荧光光谱(PL)等表征,探讨稀土离子的掺杂浓度对样品发光性能的影响。研究结果表明,合成的样品为三方晶体结构。在λex=354nm光激发下,Dy^(3+)位于482nm和576nm处的两个发射尖峰,分别归属于4F9/2→6 H15/2和4F9/2→6 H13/2的能级跃迁;在λex=454nm光激发下,Ho^(3+)位于545nm处的发射峰,归属于(5S2,5F4)→5I8的能级跃迁;而在λex=381nm光激发下,Er^(3+)在535nm和549nm的两个尖锐峰,分别归属于2 H11/2→4I15/2和4S3/2→4I15/2的能级跃迁。在合成的样品中,Dy^(3+)的最佳掺杂浓度为x=0.01,荧光体发射白光,Ho^(3+)与Er^(3+)的最佳掺杂浓度均为x=0.015,荧光体均发射绿光。

A series of phosphors Lai-xAl〇3 ： o：R E （R E = D y 3 , H o 3 ,E r 3 ） w esol-gel method. Techniques such as X-ray powder diffraction （XRD）,transmission electron microsco-py （TEM） and photoluminescence spectra （PL） were used to characterize the phosphors. The results showed that the synthesized samples were pure phase with trigonal crystal structure. Under 354 nm light excitation,LaAl〇3： Dy3 samples give emissions at 482 nm and 576 nm,which cor respond to 4F9.2 -6H15.2and 4F9.2-6H13.2transition,re s pe c t iv ely,and can be comb in e d aswhi te l ight . Un d e r 454 nm light excitation, LaAl〇3 ： Ho3 samp le s emi t green l ight at 545 nm,which belong to the （5 S2,5 F4 ） -51 transition. And LaAl〇3 ： Er 3 samp le s emi t green l ights at 535 nm （2HU .2-4115.2 ） and 549 nm （4 S3 2 to 415.2 ） under 381 nm light excitation. The optimal doping concentrHo3 or Er3 in the synthesized samples was x = 0.01 and x = 0.01 5 , re s p e c t iv e ly .