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Up-conversion photoluminescence and thermoluminescence studies of Er3+ doped Y2O3 phosphors

Optoelectronics Letters 2024年

作者： Dhaleshwari Fekar prachi p.nimje Ravi Shrivastava Siteshwari Chandrakar Department of Chemistry Shri Shankaracharya professional University Department of physics Shri Shankaracharya professional University Department of physics， Govt.VYT pG Autonomous College

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 the2p3/2→4I11/2and4S3/2→4I15/2respectively. The sample with 2.5 mol% of Er3+provided the optimum intensity in emission spectra. The sample with optimum pL emission was investigated for its Thermoluminescence glow curve exhibited Second order kinetics. The peak TL intensity was found around 236℃ 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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Judd-Ofelt analysis of Dy3+ doped Ca2MgSi2O7 phosphors resulting in white light emission

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Optoelectronics Letters 2024年

作者： Ravi Shrivastava Nandita M.prassanno prachi p.nimje Siteshwari Chandrakar Shri Shankaracharya professional University Government VYT pG Autonomous College

Di-Calcium Magnesium Silicate (Ca2MgSi2O7) doped with various concentrations （1.0， 2.0， 2.5 and 3.0 mol%） of Dysprosium （III） was prepared using a high-temperature technique named as solid state reaction method. The sample with 2.5 mol% of Dysprosium （III） underwent X-ray diffraction （XRD） characterization to confirm the proper phase formation in the sample. Observed XRD pattern matched significantly with Crystallographic Open Database （Card No. 96-210-6180） with a significantly high Figure of Merit （0.84）. photoluminescence （pL） excitation and emission spectra were also recorded. pL excitation spectrum of Di-Calcium Magnesium Silicate doped with 2.5 mol% of Dysprosium （III） exhibited a most prominent peak at 395 nm， therefore， the emission spectra of the samples were monitored at 395 nm excitation. The emission spectra exhibited prominent peaks centred at 483 nm （Blue）， 577 nm （Yellow）， and 664 nm （Orange Red） due to the transitions4F9/2→6H15/2，4F9/2→6H13/2， and4F9/2→6H11/2respectively. The colour Chromaticity Diagram （CIE） of this emission spectra was found at （0.304， 0.340） which lies in the white light region. Keeping the objective to evaluate the emitted white light for its suitability in LED application， colour Rendering Index （CRI） and colour Correlated Temperature （CCT） were also calculated. Radiation life time was estimated using Judd-Ofelt analysis.

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