Effect of doping Sr2+ on luminescence and abnormal thermal quenching behavior of silicate solid-solution green phosphor Ba9Lu2Si6O24:Eu2+
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A novel Eu2+ ions doped silicate solid-solution green phosphors, (Ba1−ySry)9Lu2Si6O24:0.14Eu2+ (0 ≤ y ≤ 0.25), have been successfully prepared by conventional sintering method. The Rietveld refinement result was taken to determine the pure phase of (Ba1−ySry)9Lu2Si6O24:0.14Eu2+ (0 ≤ y ≤ 0.25). The characteristic optical properties, especially the thermal quenching properties were studied. The excitation spectra of (Ba1−ySry)9Lu2Si6O24:0.14Eu2+ span from 350 to 460 nm. When the Sr2+ contents increased, the dominate emission peak was found to red shift from 503 to 525 nm under n-UV excitation. The emission intensity of (Ba0.75Sr0.25)9Lu2Si6O24:0.14Eu2+ can reach 90% compared with the emission intensity of commercial phosphor LMS520B. Moreover, when the doping concentration of Sr2+ reaches 25%, the phosphor can obtain a smaller thermal quenching (TQ), which still kept 85% of the initial emission intensity when the temperature increased to 150 °C. The reason why the temperature stability increased along with the increasing Sr2+ ions was illustrated expressly through the schematic diagram and the activation energy calculated by Arrhenius equation. Moreover, the chromaticity index shifted from (0.2157, 0.4165) to (0.2812, 0.5744), and the color purity of (Ba1−ySry)9Lu2Si6O24:0.14Eu2+ increased from 32.36% to 56.82% with the concentration of Sr2+ changing from y = 0 to y = 0.25.
This work is supported by the Doctoral Research Fund of Liaoning Province (Nos. 201601351, 20170520277), the National Natural Science Foundation of China (No. 11704043) and the Special Foundation for theoretical physics Research Program of China (Nos. 11747113, 11747117).
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