高浓度锰掺杂Ca14Zn6Al10O35荧光粉的近红外第二窗口发光

doi:10.12052/gdutxb.200024

摘要/Abstract

摘要： 为了开发新型的深红光或红外发光材料, 通过高温固相法在空气中合成了锰掺杂Ca₁₄Zn₆Al₁₀O₃₅:Mn荧光粉。采用X射线衍射、反射光谱、荧光光谱、荧光衰减寿命系统研究了该材料的晶体结构及发光性能。结果表明, 样品中同时存在着Mn⁴⁺和Mn⁵⁺的荧光发射, 前者在深红波段, 后者在近红外波段。当12.5%的Al离子被Mn离子替代时, Mn⁵⁺离子的发射达到最强。Mn⁵⁺离子发射是窄带发射, 峰值在1157 nm处, 对应¹E→³A₂跃迁, 荧光寿命为87.46 ms。Mn⁵⁺离子的红外发射的温度敏感性在368 K时达到最大值0.0024 K^-1。此外还观察到了由Mn⁴⁺向Mn⁵⁺的能量传递现象。能量传递拓展了Mn⁵⁺离子发射的激发波长范围, 使得商用蓝光芯片能激发Mn⁵⁺的近红外光发射。这种荧光粉能被650 nm的光激发, 而在1157 nm处发射, 对生物的实时检测有重要的意义。因此, 该荧光粉是一种具有多方面应用潜力的红外材料。

关键词: Mn⁵⁺, 红外发射, 宽谱激发, 能量传递

Abstract: Aiming at exploring new phosphors with deep red or near infrared emission, Mn ion activated Ca₁₄Zn₆Al₁₀O₃₅ phosphor was synthesized using high-temperature solid-state method in the air. The spectra of X-ray diffraction curves, reflection spectra, photoluminescence spectra, as well as photoluminescence decay curves, of the phosphors were measured. Both deep red and near infrared emission from Mn⁴⁺ and Mn⁵⁺ ions respectively, were observed. The emission of Mn⁵⁺ ion reaches a maximum when Mn ions substitutes 12.5 % Al site in Ca₁₄Zn₆Al₁₀O₃₅. Mn⁵⁺ ion shows an intense narrow band emission centering at 1157 nm due to its ¹E→³A₂ transition, with the lifetime 87.46 ms in Ca₁₄Zn₆Al_8.75Mn_1.25O₃₅. The temperature sensitivity of the near infrared emission reaches a maximum 0.0024 K^-1 at 368 K. It is worth noticed that the energy transfer from Mn⁴⁺ to Mn⁵⁺ is observed, which extend the excitation band of Mn⁵⁺ widely and enable to excite the infrared emission of Mn⁵⁺ by the commercial InGaN blue chips. Moreover, the excitation and emission peaks locating at 650 nm and 1157 nm respectively are beneficial for real-time biological detection. Thus, we believe that the phosphor has great potential as a multi-functional infrared emission material.

Key words: Mn⁵⁺, infrared emission, broad band excitation, energy transfer

中图分类号:

O482.31

廖子锋, 赵韦人, 黄浩, 宋静周. 高浓度锰掺杂Ca₁₄Zn₆Al₁₀O₃₅荧光粉的近红外第二窗口发光[J]. 广东工业大学学报, 2021, 38(01): 97-103,110.

Liao Zi-feng, Zhao Wei-ren, Huang Hao, Song Jing-zhou. Heavy Mn-Doped Ca₁₄Zn₆Al₁₀O₃₅ Phosphor and Its Near-Infrared II Light Emission[J]. Journal of Guangdong University of Technology, 2021, 38(01): 97-103,110.

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高浓度锰掺杂Ca₁₄Zn₆Al₁₀O₃₅荧光粉的近红外第二窗口发光

Heavy Mn-Doped Ca₁₄Zn₆Al₁₀O₃₅ Phosphor and Its Near-Infrared II Light Emission

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