Li、Eu掺杂NaY(WO4)2荧光粉的合成与红色发光

doi:10.3724/SP.J.1077.2013.13168

无机材料学报 ›› 2013, Vol. 28 ›› Issue (12): 1281-1285.DOI: 10.3724/SP.J.1077.2013.13168 CSTR: 32189.14.SP.J.1077.2013.13168

Li、Eu掺杂NaY(WO₄)₂荧光粉的合成与红色发光

李梦娜^1,2, 雷芳¹, 陈昊鸿², 施鹰¹, 赵景泰²

(1. 上海大学电子信息材料系, 上海200072; 2. 中国科学院上海硅酸盐研究所, 上海200050)

收稿日期:2013-03-25 修回日期:2013-05-30 出版日期:2013-12-20 网络出版日期:2013-11-15
作者简介:李梦娜(1989-), 女, 硕士研究生. E-mail: lmnllj@yahoo.com.cn
基金资助:
国家自然科学基金(50332050, 21301115)

Synthesis and Red Emission of NaY(WO₄)₂ Phosphor with Lithium and Europium Dopants

LI Meng-Na^1,2, LEI Fang², CHEN Hao-Hong², SHI Ying², ZHAO Jing-Tai²

(1. Department of Electronic Information Materials, Shanghai University, Shanghai 200072, China; 2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)

Received:2013-03-25 Revised:2013-05-30 Published:2013-12-20 Online:2013-11-15
About author:LI Meng-Na. E-mail: lmnllj@yahoo.com.cn
Supported by:
National Natural Science Foundation of China(50332050, 21301115)

摘要/Abstract

摘要： 利用固相法合成了Li⁺、Eu³⁺掺杂的NaY(WO₄)₂红色荧光粉, 并且用X射线粉末衍射仪和紫外-可见光谱仪进行了表征。研究发现纯相产物可以在1100℃下制备, 然而稳定存在的温度区间仅约100℃。和已报道的燃烧法产物不同, Eu³⁺掺杂产物的发光性质证实了浓度猝灭现象的存在, 掺杂9mol％时发光最强, 有效激发波长是393 nm, 发射光谱体现为高选择性的Eu³⁺的⁵D₀→⁷F₂电偶极跃迁, 因此适合于解决白光LED中缺乏红光成分的问题。Li^＋掺杂既没有改变Eu³⁺红光发射的择优性, 又能够调节发光强度。研究发现合适的Li^＋浓度可以增强发光, 但是浓度过大或过小对发光不利, 掺杂30mol％时发光最强。这种变化规律可以归因于点阵缺陷增加和Y原子格位不对称性增强对发光强度的不同影响之间竞争的结果。

关键词: NaY(WO₄)₂, Eu掺杂, Li掺杂, 白光LED, 荧光粉

Abstract: Li and/or Eu doped NaY(WO₄)₂ phosphors with red emission were synthesized by the solid-state reaction method and characterized by X-ray powder diffraction (XRD) and ultraviolet-visible luminescence. Pure products were obtained at 1100℃ and maintained only in the range of about 100℃. Different from the reported phosphors obtained by combustion, the luminescence of the Eu³⁺ doped samples show the concentration quenching with the maximum emission intensity at 9mol%. The electric dipole transition of ⁵D₀→⁷F₂ of Eu³⁺ under 393 nm excitation dominates the emission spectra, which is good for overcoming the lack of red component in white light LED. Lithium doped does not change the preference but control the intensity of red emission. Appropriate concentration of lithium can improve the red emission but decrease while excess or deficient, and it takes the maximum red intensity at 30mol% Li doped. The tendency can be attributed to the competition between the effects of increasing lattice defect and the enhancement of non-centrosymmetry of Y atom site.

Key words: NaY(WO₄)₂, Eu doped, Li doped, white light LED, phosphor

中图分类号:

TQ174

李梦娜, 雷芳, 陈昊鸿, 施鹰, 赵景泰. Li、Eu掺杂NaY(WO₄)₂荧光粉的合成与红色发光[J]. 无机材料学报, 2013, 28(12): 1281-1285.

LI Meng-Na, LEI Fang, CHEN Hao-Hong, SHI Ying, ZHAO Jing-Tai. Synthesis and Red Emission of NaY(WO₄)₂ Phosphor with Lithium and Europium Dopants[J]. Journal of Inorganic Materials, 2013, 28(12): 1281-1285.

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Li、Eu掺杂NaY(WO₄)₂荧光粉的合成与红色发光

Synthesis and Red Emission of NaY(WO₄)₂ Phosphor with Lithium and Europium Dopants

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