纳米晶ZrO_2∶Pr^(3+)与ZrO_2∶Pr^(3+),Sm^(3+)发光研究  

Preparation and Luminescence of Nanocrystalline ZrO_2∶Pr^(3+) and ZrO_2∶Pr^(3+),Sm^(3+)

作　　者：刘金霞[1] 吕树臣[1] 李秀明[1] 

机构地区：[1]哈尔滨师范大学物理系

出　　处：《光谱学与光谱分析》2006年第4期605-609,共5页Spectroscopy and Spectral Analysis

基　　金：黑龙江省普通高校骨干教师资助计划项目;哈尔滨师范大学科研基金(2001j01)资助项目

摘　　要：采用化学共沉淀法制备了纳米晶ZrO2∶Pr3+粉体,所制备的纳米晶ZrO2∶Pr3+粉体中Pr3+的强室温特征发射的两个主发射带为1D2—3H4和3P0—3H4跃迁。不同热处理温度下纳米晶ZrO2∶Pr3+晶体结构不同,因此它们的发光不同;ZrO2基质向Pr3+有能量传递,在高温煅烧得到的单斜相配位场中能量传递较好。荧光强度与Pr3+浓度的关系研究表明:3P0和1D2能级有不同的猝灭规律,由于[1D2,3H4]→[1G4,3F4]的交叉弛豫,使得1D2—3H4跃迁的猝灭浓度很低,在我们的实验中,掺0.1 mol%Pr3+时1D2—3H4跃迁发射最强,掺2 mol%Pr3+时3P0—3H4跃迁发射最强。文章制备的纳米晶ZrO2∶Pr3+,Sm3+中Sm3+的4G5/2—6H7/2跃迁荧光峰因Pr3+加入而增强,这除了两种离子某些能级相近产生荧光发射的叠加效应外,还存在Pr3+→Sm3+的能量传递。The nanocrystalline ZrO2 ; Pr^3＋ and ZrO2： Pr^3＋ , Sm^3＋ powders with room temperature sharp characteristic emissions were prepared by coprecipitation method. Luminescence properties of nanocrystalline ZrO2： Pr^3＋ with different sintering tem peratures and doping concentrations were studied. The energy transfer between the nanocrystalline ZrO2 host and the dopants was observed. The different Pr^3＋ concentration dependence of emission intensities of levels ^3P0 and ^1D2 was discussed. The dependence on Pr^3＋ concentration in nanoerystalline ZrO2 ： Pr^3＋ , Sm^3＋ of the emission intensity of ^4G（5-2）～^6H（7/2） transitions of Sm^3＋ ions and the energy transfer between Pr^3＋ and Sm^3＋ ions were investigated and discussed.

关 键 词：光致发光 共沉淀法 纳米晶ZrO2:Pr^3+ ZrO2:Pr^3+ Sm^3+ 能量传递 

分 类 号：O482.3[理学—固体物理]