光子学报, 2018, 47 (8): 0816001, 网络出版: 2018-09-16   

Sr2La8(SiO4)6O2:Eu(2+,3+)+)荧光粉的制备和发光性能

Preparation and Luminescent Properties of Phosphor Sr2La8(SiO4)6O2∶Eu(2+,3+)
王飞 1,2,*
作者单位
1 安徽三联学院 实验中心, 合肥 230601
2 安徽大学 化学化工学院, 合肥 230601
摘要
采用高温固相法合成了Sr2La8(SiO4)6O2∶Eu(2+,3+)荧光粉, X射线粉末衍射数据分析结果表明, 试样为氧磷灰石结构, 属于六方晶系, 具有P63/m(176)空间点群结构.荧光光谱分析结果表明, Sr2La8(SiO4)6O2∶Eu(2+,3+)激发光谱为位于200~600 nm, 由275 nm、336 nm两个宽峰和392 nm、461 nm、466 nm、523 nm等锐线峰组成.两个宽带激发峰可由272 nm、300 nm、336 nm三峰拟合而成, 峰面积比为1: 0.52: 4.09.272 nm、300 nm峰归属于Eu3+的电荷迁移激发跃迁态, 336 nm峰来自Eu2+的f-d跃迁.在393 nm激发下, Sr2La8(SiO4)6O2∶Eu(2+,3+)发射光谱在500~750 nm范围内呈现多条锐线发射, 在613 nm处发射峰最强, 以电偶极跃迁5D0→7F2为主, Eu3+占据无反演对称中心格位.Eu3+磁偶极跃迁5D0→7F1处的峰可由584.5 nm、588.5 nm、594 nm、597 nm四峰拟合而成, 表明Eu3+进入基质晶格中占据 4f(C3)和6h(Cs)两种格位.X射线光电子能谱图分析结果表明, 试样中Eu3+与Eu2+的含量比接近2∶1.Eu2+与Eu3+存在能量传递作用, 试样在紫外灯下照射呈现烛光黄色, 可用于LED.
Abstract
A series of luminescence phosphors Sr2La8(SiO4)6O2∶Eu(2+,3+)were prepared via solid-state reaction. The results of X-ray powder diffraction data analysis show that the fluorescent powder is apatite structure, belonging to the six square system, which has P63/m (176) space point group structure. The fluorescence spectra of the samples indicate that the excitation spectrum of Sr2La8(SiO4)6O2∶Eu (2+, 3+) is located at 200~600 nm, consisting of two broad peaks of 275 nm and 336 nm, as well as some other sharp peaks of 392 nm, 461 nm, 466 nm, 523 nm and so on. The two broadband excitation peaks can be fitted by three peaks of 272 nm, 300 nm and 336 nm, with a peak area ratio of 1: 0.52: 4.09. 272 nm and 300 nm belongs to the charge transport excited transition state of the Eu3+, and the 336 nm peak comes from the f-d transition of Eu2+. Under the excitation of 393 nm, the emission spectrum of Sr2La8(SiO4)6O2∶Eu(2+,3+) in 500 ~750 nm shows many sharp lines with the maximum peak at 613 nm, belonging to 5D0→7F1 of the electric dipole transition, and Eu3+ has occupied no inversion center of symmetry site. Eu3+ magnetic dipole transition from 5D0→7F1 peak is fitted by four peaks of 584.5 nm, 588.5 nm, 594 nm, 597 nm, showing that the Eu3+ into the host lattice occupy 4f (C3) and 6h (Cs) two case. The results of X-ray photoelectron spectroscopy analysis show that the ratio of Eu3+ and Eu2+ is close to 2∶1 in the sample. There is energy transfer between Eu2+ and Eu3+. The sample is irradiated with an ultraviolet lamp, showing a color of candlelight yellow, which has the value of application of LED.

王飞. Sr2La8(SiO4)6O2:Eu(2+,3+)+)荧光粉的制备和发光性能[J]. 光子学报, 2018, 47(8): 0816001. WANG Fei. Preparation and Luminescent Properties of Phosphor Sr2La8(SiO4)6O2∶Eu(2+,3+)[J]. ACTA PHOTONICA SINICA, 2018, 47(8): 0816001.

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