电子束还原SrAl2O4: (Eu2+, Dy3+)长余辉材料的力致发光研究

doi:10.15541/jim20140198

无机材料学报 ›› 2015, Vol. 30 ›› Issue (1): 93-96.DOI: 10.15541/jim20140198 CSTR: 32189.14.10.15541/jim20140198

电子束还原SrAl₂O₄: (Eu²⁺, Dy³⁺)长余辉材料的力致发光研究

沈冬冬, 季振国

(杭州电子科技大学电子材料与器件实验室, 杭州310018)

收稿日期:2014-04-14 修回日期:2014-07-28 出版日期:2015-01-20 网络出版日期:2014-12-29
作者简介:沈冬冬(1991–), 男, 硕士研究生. E-mail: 454201250@qq.com
基金资助:
国家自然科学基金(61372025)

Mechanoluminescence of Persistent Luminescent SrAl₂O₄: (Eu²⁺, Dy³⁺) Material Prepared by Electron Beam Reduction

SHEN Dong-Dong, JI Zhen-Guo

(Laboratory of Electronic Materials and Devices, Hangzhou Dianzi University, Hangzhou 310018, China)

Received:2014-04-14 Revised:2014-07-28 Published:2015-01-20 Online:2014-12-29
About author:SHEN Dong-Dong. E-mail: 454201250@qq.com
Supported by:
National Natural Science Foundation of China (61372025)

摘要/Abstract

摘要：

通过高温烧结和电子束还原法制备了SrAl₂O₄: (Eu²⁺, Dy³⁺)长余辉发光材料, 并利用球磨获得了SrAl₂O₄: (Eu²⁺, Dy³⁺)长余辉发光粉。通过把发光粉与环氧树脂混合制备了含有SrAl₂O₄: (Eu²⁺, Dy³⁺)长余辉发光粉的夜光胶, 利用丝网印刷涂敷技术及热处理在石英玻璃上涂敷了厚度为1000 nm量级的SrAl₂O₄: (Eu²⁺, Dy³⁺)长余辉发光膜。通过小球下落冲击法和一套自制的基于一个雪崩二极管和皮安表的测试装置研究了这种长余辉发光膜的力致发光特性。研究发现, 电子束还原法制备的SrAl₂O₄: (Eu²⁺, Dy³⁺)长余辉发光膜具有很好的力致发光特性, 具有高达1.25的信背比和很高的信噪比。力致发光强度与小球下落前的初始高度即冲击发生前小球的动能成指数关系, 光谱特性及衰减特性与长余辉发光相似。上述结果表明, 力致发光是小球冲击能传递给电子并引起电子进入陷阱能级然后释放引起的。

关键词: 长余辉发光, 力致发光, 电子束还原

Abstract:

Long persistent luminescent SrAl₂O₄: (Eu²⁺, Dy³⁺) was prepared by electron beam reduction. The as- prepared material was mechanically ball-milled into fine powder, and the powder was mixed with wear resistant epoxy resin. Then, the epoxy resin mixed persistent luminescent was coated on quartz glass plate by screen printing with thickness of about 1000 nm. The mechanoluminescent properties of the as-persistent luminescence film was characterized by falling ball impact technique with a homemade device for measuring mechanoluminescence intensity based on a single avalanche diode and a pico-amper meter. It is found that electron beam reduced SrAl₂O₄: (Eu²⁺, Dy³⁺) shows strong mechanoluminescence with high signal/background ratio of 1.25 and high signal/noise ratio. Further study found that intensity of the mechanoluminescence produced was proportional to exponential of the initial height of the ball (i.e., the final kinetic energy of the ball before impact) before falling down, and a decay curve was similar to that of persistent photoluminescence. These results indicate that mechanoluminescence is caused by impact energy of the ball which promotes electrons into traps, and then release via normal long persistent luminescent.

Key words: persistent luminescence, mechanoluminescence, electron beam reduction

中图分类号:

TQ174

沈冬冬, 季振国. 电子束还原SrAl₂O₄: (Eu²⁺, Dy³⁺)长余辉材料的力致发光研究[J]. 无机材料学报, 2015, 30(1): 93-96.

SHEN Dong-Dong, JI Zhen-Guo. Mechanoluminescence of Persistent Luminescent SrAl₂O₄: (Eu²⁺, Dy³⁺) Material Prepared by Electron Beam Reduction[J]. Journal of Inorganic Materials, 2015, 30(1): 93-96.

图/表 6

图 1 力致发光测量装置示意图

Fig. 1 Schematic diagram of the measurement apparatus for mechanoluminescence. 1. Stainless steel ball; 2. SrAl2O4: (Eu2+, Dy3+) film; 3. Quartz glass; 4. Avalanche photo-diode; 5. Connecting wire; 6. Pico-ampere meter

图 2 电子束还原SrAl2O4: (Eu2+, Dy3+)的SEM照片

Fig. 2 SEM topography of SrAl2O4: (Eu2+, Dy3+) phosphor reduced by e-beam

图 3 不同高度落下的小球撞击引起的力致发光

Fig. 3 Mechanoluminescence caused by ball-falling impacts from different heights

图 4 力致发光光谱与长余辉荧光光谱的比较

Fig. 4 Comparison between mechanoluminescence and persistent luminescence. Ball-falling impact from 50 cm height

图 5 小球从50 cm高度下落时冲击引发的力致发光光强的衰减特性曲线

Fig. 5 Decay curve of the mechanoluminescence for the ball falling from 50 cm height

图 6 力致发光强度与小球初始高度h的关系

Fig. 6 Mechannoluminescence intensity versus initial falling height

参考文献 13

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电子束还原SrAl₂O₄: (Eu²⁺, Dy³⁺)长余辉材料的力致发光研究

Mechanoluminescence of Persistent Luminescent SrAl₂O₄: (Eu²⁺, Dy³⁺) Material Prepared by Electron Beam Reduction

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