摘要
本文采用固相反应的方法合成了一系列(Ce,Gd,Mn)MgB_5O_(10)磷光体。观察到合成温度、灼烧时间、原料配比对磷光体的形成和发光亮度有重要影响。X射线衍射分析表明,磷光体结构与LaMgB_5O_(10)相同,属单斜晶系、空间群P2_(1/c)。用EPR确定了磷光体中锰离子为二价。测定了(Ce_(0.2)La_(0.2))MgB_5O_(10),(Gd_(0.7)La_(0.3))MgB_5O_(10),(Mn_(0.05)La_(0.95))MgB_5O_(10),(Ce_(0.2)Mn_(0.05)La_(0.75))MgB_5O_(10),(Gd_(0.95)Mn_(0.05))MgB_5O_(10)、(Ce_(0.2)Gd_(0.8))MgB_5O_(10)和(Ce_(0.2)Gd_(0.75)Mn_(0.05))MgB_5O_(15)等磷光体的光谱。根据光谱数据讨论了(Ce_(0.2)Gd_(0.75)Mn_(0.05))MgB_5O_(10)磷光体中能量传递过程为:Ce^(3+)→Mn^(2+),Gd^(3+)→Mn^(2+)以及Ce^(3+)→Gd^(3+)→Mn^(2+),其中Ce^(3+)离子可将能量高效地传递给Gd^(3+),Gd^(3+)离子起着中间体的作用。
A scries of (Ce, Gd, Mn)MgK5O10 phospnors nave Dccn synthesized by solid state reaction method. The influences of the temperature,the fire time and the ratio of the raw material were investigated. X-ray diffraction patterns show that the structure of (Cc, Gd, Mn)MgB5O10 is the same as that of LaMgB5O10 and both of them belong to monoclinic System, space group P21/c.The EPR results show that the manganese ion has a valency of two in (Cr, Gd, Mn)MgB6O10.The spectra of (Ce0:2La0:8) MgB6O10, (Gdo:7Lao:3) MgB5O10,( Mn0:05 La0:95)MgB5O10, (Ceo:zMno:oBLa0:75)MgBBO,0, (Gd0:59Mno:06 )MgB5O10, (Ceo:2Gdo:8)MgB5O10 and (Ce0:2Mn0:05La0:75)MgB5O10 have been measured. The spectra show that the processes of energy transfer in the phosphors are Ce3+-Mn2+, Gd3+-Mn2 + and Ce3+-Gd3+-Mn2 + ,
出处
《发光学报》
EI
CAS
CSCD
北大核心
1989年第4期304-310,共7页
Chinese Journal of Luminescence
基金
国家自然科学基金
