Eu3+,Bi3+共掺CaCO3红色荧光粉材料性能的研究
A Study of Luminescent Properties of CaCO3:Eu3+, Bi3+ Red Phosphors

作者: 吴龙艳 , 李芸 , 鄢 波 , 隋成华 :浙江工业大学,理学院,浙江 杭州;

关键词: 能量传递CaCO3:Eu3+Bi3+红色荧光粉Energy Transfer CaCO3:Eu3+Bi3+ Red Phosphor

摘要:
以CaCO3,Eu2O3,Bi2O3为主要材料,通过水热共沉淀法合成了Eu3+和Bi3+共掺的碳酸钙。研究发现,Eu3+和Bi3+共掺的碳酸钙荧光粉在360 nm近紫外光(Bi3+激发峰、非Eu3+激发峰)的激发下有Eu3+的特征发射峰,考虑到Eu3+的激发谱和Bi3+的发射谱之间存在重叠,该结果说明Eu3+和Bi3+之间存在的能量传递可提高CaCO3在红光波段的发光效率。其中,CaCO3:Eu3+, Bi3+最强发射峰在593 nm附近处,Eu3+的跃迁以磁偶极跃迁5D0~7F1为主,Eu3+在晶体场中占据严格的反演中心。随着Eu3+含量的增加,Eu3+的发射峰相对光强先增大后减小,说明过量的Eu3+会导致浓度淬灭。此类红色荧光粉发光效率高,价格低廉,在LED工业方面具有潜在价值。

Abstract: CaCO3:Eu3+, Bi3+ are synthesized by the hydrothermal co-precipitation method. Under the ultraviolet light excitation at 360nm, which is the excitation wavelength of Bi3+ but not of Eu3+, the typical emission peaks of Eu3+ are observed. Considering that the excitation spectra of Eu3+ and the emission spectra of Bi3+ are partially overlapped, these results show that the luminescent efficiency of CaCO3 phosphors can be improved by the energy transfer from Bi3+ to Eu3+. The maximal emission peak of CaCO3:Eu3+, Bi3+ locates in the vicinity of 593 nm, corresponding to magnetic-dipole transition 5D0→7F1 of Eu3+, which confirms that the Eu3+ ion locates in a high inversion center. With the increase of the doping concentration of Eu3+, the relative light intensity of Eu3+ emission peak first enhances then decreases. This can be explained by phenomenon of concentration quenching which occurs when Eu3+ doping concentration is too high. This red phosphor material with high efficiency and low price has great potential in the LED industry.

文章引用: 吴龙艳 , 李芸 , 鄢 波 , 隋成华 (2015) Eu3+,Bi3+共掺CaCO3红色荧光粉材料性能的研究。 光电子, 5, 49-56. doi: 10.12677/OE.2015.54008

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