As a cyan-emitting oxonitridosilicate phosphor,BaSi2O2N2∶Eu2+ can be used as a competent cyan compensator to improve the color rendering index of white light-emitting diodes (WLEDs).However,low luminescence efficiency and poor thermal stability of this type of phosphor seriously suppress its actual application in full-spectrum lighting.The replacements of Ba2+ by Lu3+ and Ba2+-Si4+ by Lu3+-Al3+ can greatly increase the luminescence intensity and improve the thermal stability at the same time.With Lu3+ doping,the internal quantum efficiency ηIQE of Ba0.925Si2O2N2∶0.03Eu2+,0.045Lu3+ is 24.08％ higher than that of Ba0.97Si2O2N2∶0.03Eu2+.After Al3+ co-doping,the ηIQE is further increased by 10.31％compared to Ba0.925Si2O2N2∶0.03Eu2+,0.045Lu3+.When the temperature rises to 473 K,the luminescence intensity of Ba0.925Si2O2N2∶0.03Eu2+,0.045Lu3+ maintains 62.32％ of that at room temperature,which increases by 17.35％ in relative to the Ba0.97Si2O2N2∶0.03Eu2+,while the luminescence intensity of Ba0.925Si1.97O2N2∶0.03Eu2+,0.045Lu3+,0.03Al3+ keeps 73.87％ of the initial value,which increases by 18.52％ compared to Ba0.925Si2O2N2∶0.03Eu2+,0.045Lu3+.The mechanisms for luminescence and thermal stability improvement are proposed.The Ba0.925Si1.97O2N2∶0.03Eu2+,0.045Lu3+,0.03Al3+ cyan phosphor,Y3Al5O12∶Ce3+ yellow phosphor and CaAlSiN3∶Eu2+ red phosphor are mixed thoroughly and coated on a blue LED (450 nm) to assemble a WLED.The WLED demonstrates a color rendering index (Ra) of 97.1 at 150 mA,and the R1-R15 values are all above 90.The results indicate that as an effective cyan compensator in WLED,the BaSi2O2N2∶Eu2+,Lu3+,Al3+ phosphor has great application prospect in the field of full-spectrum lighting.

Di Wu;Lili Liu;Huangbin Duan;Junrong Wang;Wanfang Zou;Jiaqing Peng;Xinyu Ye

Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China;National Engineering Research Center for Ionic Rare Earth,Ganzhou 341000,China;Key Laboratory of Rare Earth Luminescence Materials and Devices of Jiangxi Province,Ganzhou 341000,China;Jiangxi Rare Earth Functional Materials Technology Co.,Ltd.,Ganzhou 341000,China

稀土学报（英文版）

[1]Di Wu;Lili Liu;Huangbin Duan;Junrong Wang;Wanfang Zou;Jiaqing Peng;Xinyu Ye-.A comparison research on replacements of Ba2+ by Lu3+ and Ba2+-Si4+ by Lu3+-Al3+ in BaSi2O2N2∶Eu phosphors)[J].稀土学报（英文版）,2022(01):20-28

BaSi2O2N2,oxonitridosilicate,IQE,925Si2O2N2,03Eu2+,045Lu3+,97Si2O2N2,925Si1,97O2N2,03Al3+

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