Near-ultraviolet excited Eu3+ doped KSrY(BO3)2 phosphors for solid-state lighting: synthesis, structure and photoluminescent properties
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A series of KSrY(BO3)2: Eu3+ phosphors have been prepared by the conventional solid-state reaction method for the first time and characterized using X-ray diffraction, UV–Vis absorbance, as well as Photoluminescence techniques. The XRD results indicated that all prepared samples could be attributable to the monoclinic structure in space group P21/m. The combination of first-principles calculations with UV–Vis absorption spectra confirmed the direct band gap characteristic of the phosphors. Upon 394 nm excitation, the 5D0→7F1 transition of the emission spectra dominated when the Eu3+ ions concentration was low, but the 5D0→7F2 transition rapidly increased and dominated with the doping concentration increasing. When the concentration of Eu3+ ions was 40%, the phosphors has the best luminescence and its CIE chromaticity coordinates were located at (0.6399, 0.3584), the color purity was as high as 99.9%. In addition, correlated color temperature, decay properties and Judd–Ofelt (J–O) theory were discussed in detail.
This work is financially supported by the Program for Tackling Key Problems of Science and Technology Department of Shaanxi province (2015GY173).
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