化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (10) : 109-111.

新材料与新技术

CaWO₄∶Eu³⁺红色荧光粉的微波合成及性能研究

曹静,王永锋,李兆

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Preparation and property of CaWO₄∶Eu³⁺ red phosphor

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摘要

采用微波加热法合成了白光LED用CaWO₄∶Eu³⁺红色荧光粉。利用X射线衍射仪(XRD)对其荧光粉样品的结构进行表征,通过荧光分光光度计研究了其激发、发射光谱。结果表明:所合成的CaWO₄∶Eu³⁺荧光粉样品均为白钨矿结构。合成的一系列荧光粉都可被近紫外光(396nm)有效激发,并且其主发射峰位于617nm处,归属于发光中心Eu³⁺的 ⁵D₀→⁷F₂电偶极跃迁,因而发出红色的光;当选择MnO₂为微波吸收剂,微波加热时间为20min,功率为590W时,CaWO₄∶Eu³⁺荧光粉样品的发光强度最佳。

Abstract

CaWO₄∶Eu³⁺ red phosphor for white LED was synthesized by microwave heating.The structure of samples were characterized by X-ray diffraction(XRD).The excitation and emission spectra were studied by fluorescence spectrophotometer.The results showed that the samples were scheelite structure.A series of phosphors can be excited by near ultraviolet light (396nm).It was obvious that the main emission peak was located at 617nm and the dipole transition of ⁵D₀→⁷F₂ belonging to the emission center Eu³⁺.It was found that the luminescence intensity of samples could be improved effectively.At the same time,the effects of microwave absorber,microwave heating time and heating power,and the effect of different rare earth doped ions on the structure and luminescence properties of phosphor were studied.

关键词

红色荧光粉 / 钨酸钙 / 铕 / 微波加热

Key words

red phosphor / calcium tungstate / trivalent europium / microwave synthesis

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曹静,王永锋,李兆. CaWO₄∶Eu³⁺红色荧光粉的微波合成及性能研究[J]. 化工新型材料, 2018, 46(10): 109-111 DOI:

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