Eu2+在KNaCa2(PO4)2中的发光及晶体学格位

doi:10.3724/SP.J.1077.2011.00731

无机材料学报 ›› 2011, Vol. 26 ›› Issue (7): 731-734.DOI: 10.3724/SP.J.1077.2011.00731

Eu²⁺在KNaCa₂(PO₄)₂中的发光及晶体学格位

王志军¹, 李妍², 王颖¹, 李盼来¹, 郭庆林¹, 杨志平¹

(河北大学 1. 物理科学与技术学院; 2. 化学与环境科学学院, 保定071002)

收稿日期:2010-09-13 修回日期:2010-10-25 出版日期:2011-07-20 网络出版日期:2011-06-20
作者简介:王志军(1979-), 女, 硕士, 讲师. E-mail: wangzhijunmail@yahoo.com.cn
基金资助:
国家自然科学基金(50902042); 河北省自然科学基金(E2009000209, E2010000283); 河北省教育厅基金(2009313); 发光与光信息技术教育部重点实验室研究基金(2010LOI12)

Luminescence and Crystallographic Sites of Eu²⁺ in KNaCa₂(PO₄)₂

WANG Zhi-Jun¹, LI Yan², WANG Ying¹, LI Pan-Lai¹, GUO Qing-Lin¹, YANG Zhi-Ping¹

(1. College of Physics Science & Technology, Hebei University, Baoding 071002, China; 2. College of Chemistry & Environmental Science, Hebei University, Baoding 071002, China)

Received:2010-09-13 Revised:2010-10-25 Published:2011-07-20 Online:2011-06-20
Supported by:
National Natural Science Foundation of China (50902042); Natural Science Foundation of Hebei Province; (E2009000209, E2010000283); Research Foundation of Education Bureau of Hebei Province (2009313); Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education China (2010LOI12)

摘要/Abstract

摘要： 采用高温固相法制备了KNaCa₂(PO₄)₂:Eu²⁺蓝色荧光粉, 并研究了材料的发光特性. 在400 nm近紫外光激发下, 材料呈非对称的单峰发射, 主峰位于470 nm. 监测470 nm发射峰, 对应的激发光谱覆盖200~450 nm, 主峰位于400 nm, 说明材料能够很好的吸收紫外-近紫外光, 发射蓝色光. 利用van Uitert公式计算了Eu²⁺取代KNaCa₂(PO₄)₂中Ca²⁺时所占晶体学格位, 得出461和502 nm发射分别归属于八配位和六配位的Eu²⁺发射. 研究了Eu²⁺掺杂浓度对KNaCa₂(PO₄)₂:Eu²⁺材料发射强度的影响, 结果显示Eu²⁺的最佳掺杂浓度为1mol%, 利用Dexter理论得出其浓度猝灭机理为电偶极-电偶极相互作用.

关键词: 白光LED, KNaCa₂(PO₄)₂;Eu²⁺, 发光, 晶体学格位

Abstract: A blue phosphor, KNaCa₂(PO₄)₂:Eu²⁺, was prepared by the high temperature solid-state method, and its luminescent characteristics were investigated. The spectral characteristics show that it can be effectively excited by near ultraviolet light (400 nm), and exhibits blue light (470 nm). The crystallographic sites of Eu²⁺ in KNaCa₂(PO₄)₂ are calculated by van Uitert formula. In KNaCa₂(PO₄)₂:Eu²⁺, the emission band centered at 461 nm originates from the Eu²⁺ center of the eight compounds, and the emission band centered at 502 nm originates from the Eu²⁺ center of the six compounds. The influence of Eu²⁺ concentration on the emission intensity of the phosphor is investigated. The result shows that the emission intensities firstly increase with the increase in Eu²⁺ concentration, reach a maximum at 1mol% Eu²⁺, and then decrease. The concentration quenching mechanisms are the d-d interaction by Dexter theory.

Key words: white LED, KNaCa₂(PO₄)₂;Eu²⁺, luminescence;crystallographic sites

中图分类号:

O644
O482

王志军, 李妍, 王颖, 李盼来, 郭庆林, 杨志平. Eu²⁺在KNaCa₂(PO₄)₂中的发光及晶体学格位[J]. 无机材料学报, 2011, 26(7): 731-734.

WANG Zhi-Jun, LI Yan, WANG Ying, LI Pan-Lai, GUO Qing-Lin, YANG Zhi-Ping. Luminescence and Crystallographic Sites of Eu²⁺ in KNaCa₂(PO₄)₂[J]. Journal of Inorganic Materials, 2011, 26(7): 731-734.

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Eu²⁺在KNaCa₂(PO₄)₂中的发光及晶体学格位

Luminescence and Crystallographic Sites of Eu²⁺ in KNaCa₂(PO₄)₂

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