Pb2+掺杂CaMoO4∶Dy3+,Eu3+荧光粉发光性能及能量传递机理的研究 Luminescence Properties and Energy Transfer Mechanism of Pb2+ Doped CaMoO4∶Dy3+,Eu3+ Phosphors期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Pb2+掺杂CaMoO4∶Dy3+,Eu3+荧光粉发光性能及能量传递机理的研究

引用本文：	胡斌,郭亮,杨淑敏,曹丽萍.Pb2+掺杂CaMoO4∶Dy3+,Eu3+荧光粉发光性能及能量传递机理的研究[J].人工晶体学报,2021,50(5):871-876.

作者姓名：	胡斌郭亮杨淑敏曹丽萍

作者单位：	喀什大学物理与电气工程学院,喀什 844006

基金项目：	喀什大学高层次人才科研启动经费项目(GCC18ZK-002)

摘要：	采用共沉淀法合成了Pb²⁺掺杂CaMoO₄∶Dy³⁺,Eu³⁺荧光粉,通过X射线衍射仪、荧光分光光度计对荧光粉的物相组成、发光特性以及激活离子间能量传递效率进行了表征及分析。结果表明,掺杂Pb²⁺的CaMoO₄∶Dy³⁺,Eu³⁺荧光粉样品没有出现新的衍射峰,说明Pb²⁺很好地代替Ca²⁺进入到晶格当中,CaMoO₄∶0.05Dy³⁺,0.15Eu³⁺,0.15Pb²⁺荧光粉晶胞参数为a=b=0.548 9 nm, c=1.275 3 nm, Z=2,属于四方晶系,在391 nm波长激发下,484 nm处为Dy³⁺(⁴F_9/2→⁶H_15/2)的蓝光特征发射峰,575 nm处为Dy³⁺(⁴F_9/2→⁶H_13/2)跃迁产生的黄光发射峰,593 nm处为Eu³⁺(⁵D₀→⁷F₁)跃迁产生的橙光发射峰,619 nm处为Eu³⁺(⁵D₀→⁷F₂)跃迁产生的红光发射峰。通过计算得出CaMoO₄∶Dy³⁺,Eu³⁺荧光粉中Dy³⁺和Eu³⁺之间临界传递距离为1.542 6 nm,能量传递机理是偶极-四极相互作用,能量传递效率接近60.31%,掺杂金属离子Pb²⁺的荧光粉样品能量传递效率最高提升至72.40%。所以,掺杂Pb²⁺能够大幅度提升Dy³⁺与Eu³⁺之间能量传递效率和改善荧光粉的发光性能,因此其在白光LED领域具有重要研究意义。
关键词：	白光LED 钼酸盐共沉淀法稀土发光能量传递
收稿时间：	2021-03-09
Luminescence Properties and Energy Transfer Mechanism of Pb2+ Doped CaMoO4∶Dy3+,Eu3+ Phosphors

HU Bin,GUO Liang,YANG Shumin,CAO Liping.Luminescence Properties and Energy Transfer Mechanism of Pb2+ Doped CaMoO4∶Dy3+,Eu3+ Phosphors[J].Journal of Synthetic Crystals,2021,50(5):871-876.

Authors:	HU Bin GUO Liang YANG Shumin CAO Liping

Affiliation:	School of Physics and Electrical Engineering, Kashgar University, Kashgar 844006, China

Abstract:	Pb²⁺ doped CaMoO₄∶Dy³⁺,Eu³⁺ phosphors were synthesized by coprecipitation method. The phase composition, luminescence characteristics and energy transfer efficiency between activated ions were characterized and analyzed by X-ray diffractometer and fluorescence spectrophotometer. The results show that the CaMoO₄∶Dy³⁺,Eu³⁺doped with Pb²⁺ phosphor samples have no new diffraction peaks compared with the undoped phosphor samples. The above shows that Pb²⁺ is a good substitute for Ca²⁺ enters into the crystal lattice. The unit cell parameters are a=b=0.548 9 nm, c=1.275 3 nm, Z=2 belongs to the tetragonal crystal system for CaMoO₄∶0.05Dy³⁺,0.15Eu³⁺,0.15Pb²⁺ phosphor. Under the excitation of 391 nm wavelength, it can be seen that 484 nm blue light emission peak attributes to Dy³⁺(⁴F_9/2→⁶H_15/2), 575 nm is the yellow light emission peak produced by Dy³⁺ (⁴F_9/2→⁶H_13/2) transition, 593 nm is the orange light emission peak produced by Eu³⁺ (⁵D₀→⁷F₁) transition, and 619 nm is the red light emission peak produced by Eu³⁺ (⁵D₀→⁷F₂) transition. The critical transfer distance between Dy³⁺ and Eu³⁺ in CaMoO₄∶Dy³⁺,Eu³⁺ phosphors can be obtained by calculation, which is 1.542 6 nm. The energy transfer mechanism is dipole-quadrupole interaction, the energy transfer efficiency is close to 60.31%, and the maximum sample energy transfer efficiency increases to 72.40% for Pb²⁺ doped phosphor. Therefore, it is concluded that doping with Pb²⁺ can greatly increase the energy transfer efficiency between Dy³⁺ and Eu³⁺ and improve the luminous performance of phosphors, so it has important research significance in the field of white LEDs.

Keywords:	white LED molybdate coprecipitation method rare earth luminescence energy transfer
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