Up-conversion photoluminescence and Thermoluminescence studies of Er3+ doped Y2O3 phosphors
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Abstract:
This article reports the preparation of Yttrium Aluminate (Y2O3) doped with various concentrations of Er3+ using high temperature synthesis method. Photoluminescence Emission spectra of the samples were recorded at an excitation of 980 nm laser source. Two prominent peaks centered at 484 and 574 nm were found and attributed the 2P3/2 ? 4I11/2 and 4S3/2 ? 4I15/2 respectively. The sample with 2.5 mol% of Er3+ provided the optimum intensity in emission spectra. The ability of Er3+ to function like activator and sensitizer both makes it able to exhibit up-conversion properties. The sample with optimum PL emission was investigated for its Thermoluminescence glow curve exhibited Second order kinetics. The peak TL intensity was found around 236oC i.e. towards high temperature which supports the fact of formation of deeper traps, therefore, the material taken may be regarded as a good candidate for LED applications.
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