典型文献
Red-emitting CaWO4∶Eu3+,Tm3+ phosphor for solid-state lighting:Luminescent properties and morphology evolution
文献摘要：
CaWO4∶xEu3+,yTm3+ crystals were obtained by facile synthesis at low temperature by the microwave-assisted hydrothermal method (MAH).The phase formation,morphology,luminescent properties and energy transfer were investigated.The X-ray diffraction (XRD) results show the formation of a scheelite-like tetragonal structure without the presence of secondary phases,The growth mechanism of hierar-chical microstructures based on self-assembly and Ostwald-ripening processes was evaluated,obtaining different types of morphologies.The luminescence spectra of CaWO4∶Eu3+,Tm3+ at 325 nm excitation show the predominance of red emission at the 5D0 → 7F2 (Eu3+) transition at 624 nm.This feature signals dominant behavior of the electric dipole type.The presence of Tm3+ is notably evident in the absorption spectra by the related excitation transitions:3H6 → 1G4,3H6 → 3F3 and 3H6 → 3H4.Color parameters are discussed to characterize CaWO4∶Eu3+,Tm3+ emission.The study of the emission spectrum as a function of the concentration of Eu3+ (x mol％) and Tm3+ (y mol％) indicates that the CaWO4∶Eu3+,Tm3+ phosphors show stronger red emission intensity and exhibit the CIE value of x =0.63 and y =0.35.The photo-luminescence results show 97％ high color purity for CaWO4∶4 mol％Eu3+,a high CRI (92％) and a low CCT of 1085 K.These results demonstrate that the CaWO4∶Eu3+,Tm3+ red phosphors are promising as color converters for application in white light-emitting diodes and display devices.
文献关键词：
中图分类号：
作者姓名：
L.X.Lovisa;J.M.P.da Silva;A.A.G.Santiago;M.Siu Li;E.Longo;C.A.Paskocimas;M.R.D.Bomio;F.V.Motta
作者机构：
Institute of Physics and Chemistry,Federal University of Itajubá (UNIFEI),Itajubá,MG,37500-903,Brazil;LSQM-Laboratory of Chemical Synthesis of Materials-Department of Materials Engineering,Federal University of Rio Grande Do Norte,P.O.Box 1524,59078-900,Natal,RN,Brazil;IFSC,USP,Av.Trabalhador S(a)o Carlense,400,CEP 13566-590,S(a)o Carlos,SP,Brazil;CDMF-LIEC,UFSCar,P.O.Box 676,13565-905,S(a)o Carlos,SP,Brazil
文献出处：
引用格式：
[1]L.X.Lovisa;J.M.P.da Silva;A.A.G.Santiago;M.Siu Li;E.Longo;C.A.Paskocimas;M.R.D.Bomio;F.V.Motta-.Red-emitting CaWO4∶Eu3+,Tm3+ phosphor for solid-state lighting:Luminescent properties and morphology evolution)[J].稀土学报（英文版）,2022(02):226-233
A类：
yTm3+
B类：
Red,emitting,CaWO4,solid,state,lighting,Luminescent,properties,morphology,evolution,xEu3+,crystals,were,obtained,by,facile,synthesis,low,temperature,microwave,assisted,hydrothermal,method,MAH,formation,luminescent,energy,transfer,investigated,ray,diffraction,results,show,scheelite,like,tetragonal,without,presence,secondary,phases,growth,mechanism,hierar,chical,microstructures,self,assembly,Ostwald,ripening,processes,was,evaluated,obtaining,different,types,morphologies,luminescence,spectra,excitation,predominance,emission,5D0,7F2,This,feature,signals,dominant,behavior,electric,dipole,notably,evident,absorption,related,transitions,3H6,1G4,3F3,3H4,Color,parameters,are,discussed,characterize,study,spectrum,function,concentration,indicates,that,phosphors,stronger,intensity,exhibit,CIE,value,photo,high,color,purity,CRI,CCT,These,demonstrate,promising,converters,application,white,diodes,display,devices
AB值：
0.552241
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