A series of Eu2+/Dy3+single doped and co-doped Na3Sc2(PO4)3 phosphors were synthesized by the high-temperature solid-state method,and their phase,morphology,and luminescence properties were characterized.Under the excitation of 370 nm,the Na3Sc2(PO4)3∶Eu2+,Dy3+phosphor can emit white light whose spectrum is composed of a broad emission band centered at 460 nm and the other three peaks at 483,577,and 672 nm,respectively.There is energy transfer from Eu2+to Dy3+ion in Na3Sc2(PO4)3∶Eu2+,Dy3+phosphor due to the good overlap between the emission spectrum of Na3Sc2(PO4)3∶Eu2+and the excitation spectrum of Na3Sc2(PO4)3∶Dy3+,which is further confirmed by the fluorescence lifetime decrease of Eu2+ion with the increase of Dy3+concentration.The process of energy transfer is via dipole-quadruple interaction which is confirmed by applying Dexter's theory.By increasing the Dy3+concentration,the color coordinates of the Na3Sc2(PO4)3∶0.01Eu2+,xDy3+phosphors can be adjusted from blue to white,and then to yellow.The optimized concentration of Dy3+ions is 4.0 mol％,beyond which the concentration quenching will take place.The Na3Sc2(PO4)3∶Eu2+,Dy3+phosphor shows fairly good resistance to thermal quenching behavior,of which the emission intensity at 423 K can maintain 90.3％of the initial value(298 K).These results suggest that the Na3Sc2(PO4)3∶0.01Eu2+,xDy3+phosphors have potential applications as the color-tunable or a single-phase white emitting phosphor in white LEDs.

Sen Wang;Haiyan Wu;Xin Wen;Yanqing Luo;Tao Tan;Shengjian Jiao;Ran Pang;Lihong Jiang;Su Zhang;Da Li;Guanyu Liu;Chengyu Li;Hongjie Zhang

State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;University of Science and Technology of China,Hefei 230026,China;Zhongke Rare Earth(Changchun)Co.,Ltd.,Changchun 130000,China

稀土学报（英文版）

[1]Sen Wang;Haiyan Wu;Xin Wen;Yanqing Luo;Tao Tan;Shengjian Jiao;Ran Pang;Lihong Jiang;Su Zhang;Da Li;Guanyu Liu;Chengyu Li;Hongjie Zhang-.Single-phase white-emitting and tunable color phosphor Na3Sc2(PO4)3∶Eu2+,Dy3+:Synthesis,luminescence and energy transfer)[J].稀土学报（英文版）,2022(04):551-558

Na3Sc2,Dy3+single,Dy3+phosphor,Eu2+to,Dy3+ion,Eu2+and,Eu2+ion,Dy3+concentration,01Eu2+,xDy3+phosphors,Dy3+ions

Single,phase,white,emitting,tunable,color,PO4,Synthesis,luminescence,energy,transfer,series,doped,were,synthesized,by,high,temperature,solid,state,method,their,morphology,properties,characterized,Under,excitation,can,light,whose,spectrum,composed,broad,emission,band,centered,other,three,peaks,respectively,There,from,due,good,overlap,between,which,further,confirmed,fluorescence,lifetime,decrease,increase,process,via,dipole,quadruple,interaction,applying,Dexter,theory,By,increasing,coordinates,adjusted,blue,then,yellow,optimized,beyond,quenching,will,take,place,shows,fairly,resistance,thermal,behavior,intensity,maintain,initial,value,These,results,suggest,that,have,potential,applications,LEDs

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