标题:
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
关键字:
能量传递, CaCO3:Eu3+, Bi3+, 红色荧光粉Energy Transfer, CaCO3:Eu3+, Bi3+, Red Phosphor
期刊名称:
《Optoelectronics》, Vol.5 No.4, 2015-12-14
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。
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.