Y2O3∶Eu3+,Dy3+纳米荧光粉的白光发射性能

doi:10.7503/cjcu20170225

摘要/Abstract

摘要：

采用高温固相烧结法制备了系列Dy单掺杂、 Eu,Dy共掺杂和Sr,Eu,Dy共掺杂的Y₂O₃纳米荧光粉. 借助X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析了样品的晶体结构和形貌, 优化了工艺过程和参数. 系统测试了稀土掺杂Y₂O₃荧光粉的激发光谱和发射光谱. 在330 nm光激发下, 研究了Y₂O₃∶Eu³⁺,Dy³⁺纳米荧光粉的白光发射特性, 并通过调节Eu,Dy掺杂浓度, 获得了CIE为(0.32, 0.33)和色温为6100 K的强白光发射. 进一步讨论了Sr²⁺离子对Y₂O₃∶Eu³⁺,Dy³⁺纳米荧光粉白光特性的影响. 结果表明, Sr²⁺的掺入可明显改善Y₂O₃∶Eu³⁺,Dy³⁺纳米荧光粉的白光发射.

关键词: Y2O3∶Eu3+, Dy3+纳米荧光粉, 激发光谱, 发射光谱, 白光, 能量传递

Abstract:

A series of Dy³⁺ single doped, Eu³⁺, Dy³⁺ codoped and Sr²⁺, Eu³⁺, Dy³⁺ codoped Y₂O₃ nanophosphors was prepared by high-temperature solid-state sinter method. The crystal structures and morphologies of the samples were analyzed by means of XRD and SEM, and the preparation progress and parameters were optimized. The excitation and emission spectra of rare earth ions doped Y₂O₃ phosphors were measured systematically. Under 330 nm excitation, the characteristics of white light emission of Y₂O₃∶Eu³⁺,Dy³⁺phosphors were investigated, and the ideal CIE value(0.32, 0.33) and color temperature(6100 K) were achieved through adjusting the concentration of europium and dysprosium ions. At the same time, the influence of bivalent strontium ion on the white emission properties was further discussed. The result showed that the emissions of white light from Y₂O₃∶Eu³⁺,Dy³⁺ nanophosphors were improved significantly because of strontium dopant.

Key words: Y2O3∶Eu3+, Dy3+ nanophosphors, Excitation spectrum, Emission spectrum, White light, Energy transfer

中图分类号:

O611.3

TrendMD:

张寒冰, 李成仁, 李淑凤, 高心宇, 洪远志, 李志超, 孙景昌. Y₂O₃∶Eu³⁺,Dy³⁺纳米荧光粉的白光发射性能. 高等学校化学学报, 2018, 39(2): 193.

ZHANG Hanbing, LI Chengren, LI Shufeng, GAO Xinyu, HONG Yuanzhi, LI Zhichao, SUN Jingchang. White Light Emission Performance of Y₂O₃∶Eu³⁺,Dy³⁺ Nanophosphors^†. Chem. J. Chinese Universities, 2018, 39(2): 193.

图/表 10

Fig.1 XRD patterns of the nanophosphors with different sinter termpratures and dopantsa. Y2O3(JCPDS: 43-1036); b. Y2O3∶Eu3+,Dy3+-1300 ℃; c. Y2O3∶Eu3+,Dy3+-1300 ℃+H3BO3; d. Y2O3∶Eu3+,Dy3+-1400 ℃; e. Y2O3∶Eu3+,Dy3+-1400 ℃+H3BO3; f. Y2O3∶Eu3+,Dy3+, 10%Sr2+-1300 K; g. Y2O3∶Eu3+,Dy3+, 50%Sr2+-1300 K; h. SrY2O4(JCPDS:32-1272).

Fig.2 SEM images of Y2O3∶Eu3+,Dy3+(Sr2+) nanophosphors(A) Y2O3∶Eu3+,Dy3+-1300 ℃; (B) Y2O3∶Eu3+,Dy3+-1300 ℃+H3BO3; (C) Y2O3∶Eu3+,Dy3+-1400 ℃;(D) Y2O3∶Eu3+,Dy3+,10%Sr2+-1400 ℃.

Fig.3 Excitation and emission spectra of Y2O3∶1.0%Dy3+ nanophosphors

Fig.4 Luminous intensity expression of Y2O3∶Dy3+ nanophosphors

Fig.5 Excitation and emission spectra of Y2O3∶Eu3+ ,Dy3+ nanophosphors

Fig.6 Excitation and emission intensities with different Eu3+ concentrations

Fig.7 CIE values of Y2O3∶Eu3+,1.0%Dy3+ with varied Eu3+ concentrationsMolar fraction of Eu3+ and CIE value: a. 0.5%(0.29, 0.31); b. 0.8%(0.30, 0.30); c. 1.0%(0.32, 0.33); d. 1.2%(0.34, 0.33); e. 1.5%(0.32, 0.30); f. 2.0%(0.37, 0.29).

Fig.8 Excitation and emission spectra of Y2O3∶Eu3+,Dy3+(Sr2+) nanophosphors(A) and the emission intensity with different Sr2+ concentrations(B)

Fig.9 CIE values of Y2O3∶Sr2+, 1.0%Eu3+, 1.0%Dy3+ with varied Sr3+ concentrationsMolar fraction Sr2+ and CIE value: a. 5.0%(0.31, 0.31); b. 8.0%(0.32, 0.31); c. 10%(0.33, 0.32); d. 20%(0.38, 0.25); e. 30%(0.44, 0.21); f. 50%(0.35, 0.17).

Fig.10 Energy transfer from Dy3+ to Eu3+ under the codoping of Sr2+ ionNRT: non-radiative transition, ET: energy transfer.

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Y₂O₃∶Eu³⁺,Dy³⁺纳米荧光粉的白光发射性能

White Light Emission Performance of Y₂O₃∶Eu³⁺,Dy³⁺ Nanophosphors^†

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