Optical and EPR Properties of Mn- and Eu-Activated LaMgAl11O19 Phosphor |
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Authors: | Vijay Singh G Sivaramaiah J L Rao S H Kim |
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Institution: | 1. Department of Chemical Engineering, Konkuk University, Seoul, 143-701, Korea 2. Department of Physics, Government College for Men (Autonomous), Kadapa, 516 004, India 3. Department of Physics, Sri Venkateswara University, Tirupati, 517 502, India
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Abstract: | LaMgAl11O19 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 LaMgAl11O19: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 Mn2+ ions in tetrahedral and rhombic environment, respectively. The resonance signal at g = 7.23 was attributed to Eu2+ 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 → 5T2g transition of Mn3+ ions. Upon excitation at 324 nm, the material displays emission in the blue, green and red spectral region. |
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