共掺碱金属对白光LEDs用SrBPO5: Sm3+荧光粉发光的增强作用

doi:10.15541/jim20150623

摘要/Abstract

摘要：

利用传统的高温固相法合成了一种橘红色SrBPO₅:Sm³⁺荧光粉。通过X射线衍射(XRD)确定荧光粉的组成,研究了样品的光致激发(PLE)和光致发射(PL)光谱, 探究Sm³⁺离子浓度对样品发光性能的影响及浓度猝灭机理, 通过测试不同温度下的发射光谱分析了样品的热稳定性, 研究反应温度和电荷补偿剂对发光性能的影响。最后讨论了SrBPO₅:Sm³⁺, R⁺荧光粉的色坐标。结果表明: SrBPO₅:Sm³⁺, Li⁺是一种潜在的用于UV激发的白光LED的橘红色荧光粉。

关键词: 发光, SrBPO5:Sm3+, Li+, 稀土, 光谱性质

Abstract:

An orange reddish phosphor SrBPO₅:Sm³⁺ was synthesized by the traditional solid-state method. The phosphor component was characterized by the X-ray powder diffraction (XRD). The photoluminescence excitation (PLE) and emission spectra (PL) were investigated. The influence of the concentration of Sm³⁺ ions on luminescence properties of samples and concentration quenching mechanism were investigated. The results show that the as-prepared phosphor can be excited by 342 nm, 358 nm, 370 nm and 399 nm UV light and the strongest one at 399 nm. On being excited by 399 nm, the sample emits yellow, orange and red emission at different wavelength. The optimal activator molar fraction in this phosphor is 0.016 and the only sintering temperature is 1000℃. It is meant for enhancing the emission intensity of SrBPO₅:Sm³⁺phosphor if appropriate Li⁺ ions are added as charge compensator. The thermal stability was evaluated by emission spectra of phosphor at different measuring temperatures. This research studied the influence of reaction temperature and charge compensator on the luminescence characteristics. The chromaticity coordinates of SrBPO₅:Sm³⁺, R⁺ phosphor was explored. The results indicate that SrBPO₅:Sm³⁺, Li⁺ is a potential orange-reddish phosphor in near UV based white LEDs.

Key words: luminescence, SrBPO5:Sm3+, Li+, rare earth, spectral properties

中图分类号:

O433

杨敬伟, 李旭, 焦典, 吴梦颖, 王一冰, 关丽, 郭庆林, 滕枫. 共掺碱金属对白光LEDs用SrBPO₅: Sm³⁺荧光粉发光的增强作用[J]. 无机材料学报, 2016, 31(8): 876-880.

YANG Jing-Wei, LI Xu, JIAO Dian, WU Meng-Ying, WANG Yi-Bing, GUAN Li, GUO Qing-Lin, TENG Feng. Enhancing Luminescence of SrBPO₅: Sm³⁺ Phosphor by Codoping Alkali Metal for White LEDs[J]. Journal of Inorganic Materials, 2016, 31(8): 876-880.

图/表 8

Fig. 1 XRD patterns of xSm3+ doped SrBPO5 phosphor (a) and influence of Sm3+ concentration on the crystal lattice parameters (b)

Fig. 2 Excitation spectra of SrBPO5:Sm3+ phosphor monitoring for different emission peaks

Fig. 3 Emission spectra of SrBPO5:Sm3+ phosphor excited by different wavelength light

Fig. 4 Schematic energy level diagram of Sm3+ ions and the possible energy transfer

Fig. 5 Influence of Sm3+ concentration on the emission of SrBPO5:Sm3+ phosphor

Fig. 6 Emission spectra of SrBPO5:Sm3+ phosphor sintered at different temperatures

Fig. 7 Emission spectra of SrBPO5:Sm3+ phosphor prepared with different charge compensators

Fig. 8 Emission spectra of SrBPO5:Sm3+, Li+ phosphor at different temperatures

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共掺碱金属对白光LEDs用SrBPO₅: Sm³⁺荧光粉发光的增强作用

Enhancing Luminescence of SrBPO₅: Sm³⁺ Phosphor by Codoping Alkali Metal for White LEDs

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