NaGd_0.4Eu_0.6Mg_1-xZn_xWO₆ solid solution red phosphors:Microstructure variation and luminescence enhancement induced by Zn²⁺-doping

【摘要】 Red phosphor is an important component of the phosphor-converted white light-emitting diodes（pcWLEDs）.The development of the novel red phosphor with excellent luminescence properties is of great significance for high performance WLEDs.In this study,NaGd_0.4Eu_0.6Mg_1-xZn_xWO₆ red phosphors with excellent luminescence properties were successfully synthesized and systematically investigated.Our results show that the Zn²⁺-doping concentration has significant effect on the microstructures and luminescence properties of the NaGd_0.4Eu_0.6Mg_1-xZn_xWO₆ phosphors.The NaGd_0.4Eu_0.6Mg_1-xZn_xWO₆（0≤x≤0.7） samples are well crystallized pure solid solution sub-microcrystals,whereas the phase purity gradually decreases at 0.7 <x≤1.0.The NaGd_0.4Eu_0.6Mg_1-xZn_xWO₆（0 <x ≤0.5） phosphors have stronger emissions than NaGd_0.4Eu_0.6MgWO₆,and the optimized NaGd_0.4Eu_0.6Mg_0.9Zn_0.1WO₆ phosphor possesses the best luminescence properties including thermal stability,CIE chromaticity coordinate,life time and quantum yield.The packaged WLED using NaGd_0.4Eu_0.6Mg_0.9Zn_0.1WO₆ phosphor emits bright white light with higher CRI,lower CCT,and chromaticity coordinate close to the pure white light.The developed NaGd_0.4Eu_0.6Mg_1-xZn_xWO₆ phosphors have potential application in lighting and display.This work can offer an effective strategy for boosting luminescence properties of tungstate phosphors with the double perovskite structure.更多还原

【Abstract】 Red phosphor is an important component of the phosphor-converted white light-emitting diodes（pcWLEDs）.The development of the novel red phosphor with excellent luminescence properties is of great significance for high performance WLEDs.In this study,NaGd_0.4Eu_0.6Mg_1-xZn_xWO₆ red phosphors with excellent luminescence properties were successfully synthesized and systematically investigated.Our results show that the Zn²⁺-doping concentration has significant effect on the microstructures and luminescence properties of the NaGd_0.4Eu_0.6Mg_1-xZn_xWO₆ phosphors.The NaGd_0.4Eu_0.6Mg_1-xZn_xWO₆（0≤x≤0.7） samples are well crystallized pure solid solution sub-microcrystals,whereas the phase purity gradually decreases at 0.7 <x≤1.0.The NaGd_0.4Eu_0.6Mg_1-xZn_xWO₆（0 <x ≤0.5） phosphors have stronger emissions than NaGd_0.4Eu_0.6MgWO₆,and the optimized NaGd_0.4Eu_0.6Mg_0.9Zn_0.1WO₆ phosphor possesses the best luminescence properties including thermal stability,CIE chromaticity coordinate,life time and quantum yield.The packaged WLED using NaGd_0.4Eu_0.6Mg_0.9Zn_0.1WO₆ phosphor emits bright white light with higher CRI,lower CCT,and chromaticity coordinate close to the pure white light.The developed NaGd_0.4Eu_0.6Mg_1-xZn_xWO₆ phosphors have potential application in lighting and display.This work can offer an effective strategy for boosting luminescence properties of tungstate phosphors with the double perovskite structure.更多还原