首页|A novel thermally-stable single-phase phosphor Ca2InTaO6:Dy3+for NUV-excited white LEDs
A novel thermally-stable single-phase phosphor Ca2InTaO6:Dy3+for NUV-excited white LEDs
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The work focuses on the utilization of the conventional solid-state sintering procedure to synthesize white phosphors Ca2InTaO6:xDy3+(0.02≤x≤0.12).Utilizing X-ray diffraction,the phase structure of samples was examined,and the crystal structure was refined using the Rietveld method.A scanning electron microscope was used to analyze the microstructure of sample.First-principles calculations confirm that the indirect bandgap of Ca2InTaO6 is 3.786 eV.The luminous properties and energy transfer mechanism of Ca2InTaO6:xDy3+were studied using photoluminescence spectroscopy.The 4F9/2 → 6H13/2 transition of Dy3+ions is responsible for the greatest emission peak,which was measured at 575 nm.According to research,the lifespan falls as the concentration of Dy3+doping amount rises because of frequent interaction and energy transfer between Dy3+ions.The correlated color temperature of the W-LEDs packaged with Ca2InTaO6:0.08Dy3+is 4677 K and CIE 1931 chromaticity coordinates are(0.3578,0.3831).Meantime,the phosphor also shows outstanding temperature stability property,which main-tains 83.8％of its initial emission intensity at 450 K(activation energy of 0.1467 eV).The W-LEDs retain their performance for 100 min when powered at 3.4 V voltage and 600 mA current,demonstrating the packed W-LEDs'sustained operation at high temperatures.
Key Laboratory of Micro-Nano-Electronics and Software Technology of Guizhou Province,College of Big Data and Information Engineering,Guizhou University,Guiyang 550025,China
College of Computer and Information Engineering,Guizhou University of Commerce,Guiyang,550014,China
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