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Optical and EPR Properties of Mn- and Eu-Activated LaMgAl_(11)O_(19) Phosphor

机译:Mn和Eu活化LaMgAl_(11)O_(19)荧光粉的光学和EPR特性

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摘要

LaMgAl_(11)O_(19) phosphor doped with Eu and Mn ions has been prepared by the urea combustion route. The as-prepared phosphor was studied using X-ray diffraction, electron paramagnetic resonance (EPR), diffuse reflectance and photoluminescence studies. The EPR spectra of LaMgAl_(11)O_(19):Eu, Mn phosphor exhibit signals with the effective g values at g = 1.98, 4.29 and 7.23. The resonance signals at g = 1.98 and 4.29 were attributed to Mn~(2+) ions in tetrahedral and rhombic environment, respectively. The resonance signal at g = 7.23 was attributed to Eu~(2+) ions. The optical spectrum of this phosphor exhibits an intense band in the visible region and this band has been attributed to spin-allowed ~5Eg → ~5T_2g transition of Mn~(3+) ions. Upon excitation at 324 nm, the material displays emission in the blue, green and red spectral region.
机译:通过尿素燃烧路线制备了掺有Eu和Mn离子的LaMgAl_(11)O_(19)荧光粉。使用X射线衍射,电子顺磁共振(EPR),漫反射率和光致发光研究了制备的荧光粉。 LaMgAl_(11)O_(19):Eu,Mn荧光粉的EPR光谱显示的信号具有在g = 1.98、4.29和7.23时的有效g值。 g = 1.98和4.29处的共振信号分别归因于四面体和菱形环境中的Mn〜(2+)离子。 g = 7.23时的共振信号归因于Eu〜(2+)离子。该荧光粉的光谱在可见光区域显示出很强的能带,并且该能带归因于Mn〜(3+)离子的自旋允许〜5Eg→〜5T_2g跃迁。在324 nm激发后,该材料在蓝色,绿色和红色光谱区域显示发射。

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