GdPO4∶Tb3+荧光粉的制备及发光性能研究

摘要/Abstract

摘要： 稀土Tb³⁺掺杂磷酸钆(GdPO₄)绿色荧光粉是实现白光LED的潜在荧光粉,其常规水热法的制备存在反应时间较长、Tb³⁺的掺杂量偏低等问题。本文采用水热法结合高温烧结制备了一系列Gd_1-xPO₄∶xTb³⁺(x=0、1%、5%、11%、13%、15%、17%、19%)样品,通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)-能谱仪(EDS)、红外光谱仪(FT-IR)和荧光分光光度计对所得样品的相结构、形貌、元素组成、光学吸收和发光性能进行了表征。研究结果表明,所合成样品均为GdPO₄的纯相,属于单斜晶系独居石结构,且Tb³⁺均匀分布在GdPO₄基质中引起晶格收缩。在274 nm的光激发下,GdPO₄∶Tb³⁺荧光粉的最强发射峰位于545 nm处,属于Tb³⁺的⁵D₄→⁷F₅跃迁,且其荧光猝灭摩尔分数高达15%,此样品(GdPO₄∶15%Tb³⁺)表现出优异的绿光发射和良好的热稳定性。

关键词: 磷酸钆, Tb³⁺掺杂, 水热法, 高温烧结, 发光性能, 绿色荧光粉

Abstract: Rare earth Tb³⁺ doped gadolinium phosphate (GdPO₄) green phosphor is a potential phosphor for white LED, while the preparation by conventional hydrothermal method has some problems, such as long reaction time and low doping amount of Tb³⁺. A series of Gd_1-xPO₄∶xTb³⁺ (x=0, 1%, 5%, 11%, 13%, 15%, 17%, 19%) samples were prepared by hydrothermal method combined with high temperature sintering. The phase structure, morphology, elemental composition, optical absorption and luminescence properties of samples were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM)-energy spectrometer (EDS), infrared spectrometer (FT-IR) and fluorescence spectrophotometer. The results show that, all the synthesized samples are pure phase of GdPO₄ belonging to monoclinic monazite structure, and the Tb³⁺ are uniformly distributed in GdPO₄ matrix and cause lattice shrinkage. Under 274 nm photoexcitation, GdPO₄∶Tb³⁺ phosphors have the strongest emission peak at 545 nm, which belongs to ⁵D₄→⁷F₅ transition of Tb³⁺. The fluorescence quenching concentration of Tb³⁺ was determined to be 15% (molar ratio), and this sample (GdPO₄∶15%Tb³⁺) exhibits excellent green light emission and good thermal stability.

Key words: gadolinium phosphate, Tb³⁺ doping, hydrothermal method, high temperature sintering, luminescent property, green phosphor

中图分类号:

孟晓燕, 廖云, 张丽蓉, 张雨蒙, 吴丽丹, 杨流赛. GdPO₄∶Tb³⁺荧光粉的制备及发光性能研究[J]. 人工晶体学报, 2024, 53(1): 107-114.

MENG Xiaoyan, LIAO Yun, ZHANG Lirong, ZHANG Yumeng, WU Lidan, YANG Liusai. Preparation and Luminescent Properties of GdPO₄∶Tb³⁺ Phosphors[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(1): 107-114.

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GdPO₄∶Tb³⁺荧光粉的制备及发光性能研究

Preparation and Luminescent Properties of GdPO₄∶Tb³⁺ Phosphors

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