Judd-Ofelt analysis of Dy3+ doped Ca2MgSi2O7 phosphors resulting in white light emission
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Abstract:
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 transitions 4F9/2?6H15/2, 4F9/2?6H13/2, and 4F9/2 ?6H11/2 respectively. 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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