Effects of varying Alx moles on structure and luminescence properties of ZnAl_(x)O_(1.5x+1):0.1 mol%Tb^(3+)nanophosphors prepared using citrate sol-gel method  

作　　者：V.M.Maphiri L.T.Melato M.R.Mhlongo T.T.Hlatshwayo T.E.Motaung L.F.Koao S.V.Motloung 

机构地区：[1]Department of Physics,Sefako Makgatho Health Science University,P.O.Box 94,Medunsa,0204,South Africa [2]Department of Mathematics,Non Destructive Testing and Physics,Vaal University of Technology,Andries Potgieter Blvd,Vanderbijlpark,1900,South Africa [3]Department of Physics,University of Pretoria,Pretoria,0002,South Africa [4]Department of Chemistry,School of Science in the College of Science Engineering and Technology,University of South Africa,Preller Street,Muckleneuk Ridge,City of Tshwane,P.O Box 392,UNISA 0003,South Africa [5]Department of Chemistry,Sefako Makgatho Health Science University,P.O.Box 94,Medunsa,0204,South Africa [6]Department of Physics,University of the Free State(Qwaqwa Campus),Private Bag X13,Phuthaditjhaba 9866,South Africa [7]Department of Chemical and Physical Sciences,Walter Sisulu University,Mthatha,South Africa

出　　处：《Journal of Rare Earths》2023年第3期358-364,I0002,共8页稀土学报（英文版）

基　　金：Project supported by the South African National Research Foundation(NRF)Thuthuka programme(UID 99266,113947);NRF Incentive Funding for Rated Researchers(IPRR)(114924);NRF Black Academics Advancement Programme(BAAP)(138233)。

摘　　要：Un-doped and ZnAl_(x)O_(1.5x+1):0.1 mol%Tb^(3+)(ZAOT)nano-powders were synthesized via citrate sol-gel method.The AIx moles were varied in the range of 0.25≤x≤5.0.The X-ray powder diffraction(XRD)data reveal that for x<1.5,the prepared samples crystal structure consists of mixed phases of the cubic ZnAl_(2)O_(4) and hexagonal ZnO phases,while for x>1.5 the structure consists of single phase of cubic ZnAl_(2)O_(4).The Raman and Fourier-trans form infrared(FTIR)vibrational spectroscopy show the presence of vibrations emanating ZnAl_(2)O_(4) spinel.Scanning electron microscopy(SEM)and transmission electron microscopy(TEM)show the presence of irregular sphere at x>2.0 attributed to ZnAl_(2)O_(4).The photoluminescence(PL)spectroscopy reveals emissions from both the host and Tb^(3+)transitions.Emissions from Tb^(3+)are observed at 382,414,439,458 nm and 489,545,585,621 nm,which were attributed to the^(5)D_(3)→^(7)F_(6,5,4,2) and ^(5^)D_(4)→^(7)F_(6,5,4,3),respectively.The results confirm that the Tb^(3+)occupation site depends on the Alx moles.The International Commission on Illumination(CIE)colour chromaticity shows that the emission colour can be tuned from blue to green by varying the AIx moles.

关 键 词：Citrate sol-gel ZnAl_(2)O_(4)/ZnO Tb^(3+)-doped Al_(x)moles Photoluminescence Rare earths 

分 类 号：TQ422[化学工程]