Optical and EPR Properties of Mn- and Eu-Activated LaMgAl11O19 Phosphor

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...

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Bibliographic Details
Published in:Applied magnetic resonance 2014, Vol.45 (1), p.37-47
Main Authors: Singh, Vijay, Sivaramaiah, G., Rao, J. L., Kim, S. H.
Format: Article
Language:English
Subjects:
Atoms and Molecules in Strong Fields
Electron paramagnetic resonance
Laser Matter Interaction
Light emitting diodes
Manganese ions
Nitrates
Optical properties
Organic Chemistry
Phosphors
Photoluminescence
Physical Chemistry
Physics
Physics and Astronomy
Scanning electron microscopy
Solid State Physics
Spectroscopy/Spectrometry
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Summary: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 5 E g  →  5 T 2g transition of Mn 3+ ions. Upon excitation at 324 nm, the material displays emission in the blue, green and red spectral region.
ISSN:0937-9347
1613-7507
DOI:10.1007/s00723-013-0499-x