首页 | 本学科首页   官方微博 | 高级检索  
     

Ca2SiO4:Dy3+材料的制备及其发光特性
引用本文:王志军,李盼来,王 刚,杨志平,郭庆林. Ca2SiO4:Dy3+材料的制备及其发光特性[J]. 物理学报, 2008, 57(7): 4575-4579. DOI: 10.7498/aps.57.4575
作者姓名:王志军  李盼来  王 刚  杨志平  郭庆林
作者单位:(1)河北大学国际交流与教育学院,保定 071002; (2)河北大学物理科学与技术学院,保定 071002
基金项目:河北省科学技术发展基金(批准号:51215103b),河北大学青年基金(批准号:2006Q06)资助的课题.
摘    要:采用高温固相法制备了Ca2SiO4:Dy3+发光材料.在365nm紫外光激发下,测得Ca2SiO4:Dy3+材料的发射光谱为一多峰宽谱,主峰分别位于486nm,575nm和665nm处;监测575nm发射峰,测得材料的激发光谱为一多峰宽谱,主峰分别位于331nm,361nm,371nm,397nm,435nm,461nm和478nm处.研究了Dy3+掺杂浓度对Ca2SiO4:Dy3+材料发射光谱及发光强度的影响,结果显示,随Dy3+浓度的增大,黄、蓝发射峰强度比(Y/B)逐渐增大,利用Judd-Ofelt理论解释了其原因;随Dy3+浓度的增大,Ca2SiO4:Dy3+材料发光强度先增大,在Dy3+浓度为4 mol%时到达峰值,而后减小,根据Dexter理论其浓度猝灭机理为电偶极-电偶极相互作用.研究了电荷补偿剂Li+,Na+和K+对Ca2SiO4:Dy3+材料发射光谱的影响,结果显示,不同电荷补偿剂下,随电荷补偿剂掺杂浓度的增大,Ca2SiO4:Dy3+材料发射光谱强度的演化趋势相同,即Ca2SiO4:Dy3+材料发射峰强度先增大后减小,但不同电荷补偿剂下,材料发射峰强度最大处对应的补偿剂浓度不同,对应Li+,Na+和K+时,浓度分别为4mol%,4mol%和3mol%.关键词:白光LED2SiO4:Dy3+')" href="#">Ca2SiO4:Dy3+发光特性电荷补偿

关 键 词:白光LED  Ca2SiO4:Dy3+  发光特性  电荷补偿
收稿时间:2007-10-26

Preparation and luminescence characteristics of Ca2SiO4:Dy3+ phosphor
Wang Zhi-Jun,Li Pan-Lai,Wang Gang,Yang Zhi-Ping and Guo Qing-Lin. Preparation and luminescence characteristics of Ca2SiO4:Dy3+ phosphor[J]. Acta Physica Sinica, 2008, 57(7): 4575-4579. DOI: 10.7498/aps.57.4575
Authors:Wang Zhi-Jun  Li Pan-Lai  Wang Gang  Yang Zhi-Ping  Guo Qing-Lin
Abstract:The Ca2SiO4:Dy3+ phosphor was synthesized by high temperature solid-state method. The emission spectrum of Ca2SiO4:Dy3+ shows bands at 486nm,575nm and 665nm under the 365nm excitation. The excitation spectrum for 575nm emission has excitation bands at 331nm,361nm,371nm,397nm,435nm,461nm and 478nm. The effect of Dy3+ concentration on the emission spectrum and luminescent intensity of Ca2SiO4:Dy3+ was investigated.The result shows that the ratio (Y/B)of yellow emission (575nm)to blue emission (486nm)increases with increasing Dy3+ concentration,and the reason was explained by Judd-Offelt theory. The luminescent intensity firstly increases with the increasing Dy3+ concentration,then decreases,and the concentration self-quenching mechanisms are the d-d interaction according to the Dexter theory. The effect of Li+,Na+ and K+ on the emission spectra of Ca2SiO4:Dy3+ phosphor was studied. The results show that the emission spectrum intensity of Ca2SiO4:Dy3+ phosphor is greatly influenced by Li+,Na+ and K+,and the evolvement trend is the same for different charge compensations,i.e.,the emission spectrum intensity firstly increases with increasing charge compensation concentration,then decreases. However, the charge compensation concentration corresponding to the maximum emission intensity is different for different charge compensations,and the concentrations are 4,4 and 3 mol% for the Li+,Na+ and K+,respectively.
Keywords:white LED   Ca2SiO4:Dy3+   luminescent characteristics   charge compensation
点击此处可从《物理学报》浏览原始摘要信息
点击此处可从《物理学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号