Here,we report a series of Bi3+-doped Ba2Y1-xScxNbO6(0≤x≤1.0 mol)phosphors by using the traditional high temperature solid-state reaction.To achieve the structural and photoluminescent(PL)information,several experimental characterizations and theoretical calculations were carried out,including X-ray diffraction(XRD),Rietveld refinement,UV-visible diffuse reflectance and PL spectra,temperature dependent PL spectra,and density functional theoretical(DFT)calculations.The XRD results show that the Bi3+-doped Ba2Y1-xScxNbO6 samples belong to the double-perovskite phase with a cubic space group of Fm3m,and the diffraction positions shift toward high diffraction angle when the larger Y3+ions are gradually replaced by the smaller Sc3+ions.In addition,the refined XRD findings show that the Bi3+ions tend to substitute the Y3+and Sc3+sites in the Bi3+-doped Ba2Y1-xScxNbO6(0＜x＜1.0 mol)solid solutions.The PL spectra show that the emission positions of the solid solution samples tune from 446 to 497 nm with the increase of Sc3+content,which can be attributed to the modification of crystal field strength around Bi3+ions.Moreover,there is energy transfer from the Ba2YNbO6 host to Bi3+ions,which is dominated by a resonant type via a dipole-quadrupole(d-q)interaction.The Ba2Y0.6Sc0.4NbO6:0.02 molBi3+shows the strongest PL intensity under 365 nm excitation,with the best quantum efficiency(QE)of 68％,and it keeps 60％of the room temperature emission intensity when the temperature increases to 150℃,meaning that the Ba2Y0.6Sc0.4NbO6:Bi3+features excellent thermal quenching of luminescence.By combining this optimal sample with a commercial red-emitting Sr2Si5N8:Eu2+phosphor,and a commercial 365 nm UV LED chip,a white LED device,with the color temperature(CT)of 3678 K,color rendering index(CRI)of 67.9,and CIE coordinates at(0.371,0.376),is achieved.

Department of Applied Chemistry,Hengshui University,Hengshui 053000,China;Sichuan University,Chengdu 610041,China

[1]Zhihua Gao;Fengyan Fu;Lili Niu;Min Jin;Xiaohong Wang-.Emission-tunable Ba2Y1-xScxNbO6:Bi3+(0≤x≤1.0)phosphors for white LEDs)[J].稀土学报（英文版）,2022(12):1819-1826

Ba2Y1,xScxNbO6,Fm3m,Y3+ions,Sc3+ions,Bi3+ions,Y3+and,Sc3+sites,Sc3+content,Ba2YNbO6,Ba2Y0,6Sc0,4NbO6,molBi3+shows,Bi3+features,Eu2+phosphor

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