Double-perovskite materials with diverse elemental compositions have been developed as high-performance phosphors and scintillators.However,the low doping concentration of activator ions in the host matrix limits the ...Double-perovskite materials with diverse elemental compositions have been developed as high-performance phosphors and scintillators.However,the low doping concentration of activator ions in the host matrix limits the flexible tuning of luminescence properties.In this work,we propose a series of gadolinium,terbium,and europium alloyed double-perovskite lanthanide chlorides(DPLCs)to achieve colortunable photoluminescence(PL)as well as thermally and radiationally stable X-ray excited optical luminescence(XEOL).The Cs_(2)NaGdCl_(6)host allows up to 100%and 60%doping concentrations of Tb^(3+)ions for PL and XEOL,respectively,without concentration quenching.The designed Cs_(2)NaTbCl_(6)exhibits a high photoluminescence quantum yield of 73.5%.Optical encryption was achieved using Cs_(2)NaTb_(0.95)Eu_(0.05)Cl_(6),which shows excitation-wavelength-dependent dynamic emission colors.Benefiting from efficient energy transfer from Gd^(3+)to Tb^(3+)in the XEOL process,Cs_(2)NaGd_(0.4)Tb_(0.6)Cl_(6)achieves a high light yield of 27000 ph MeV-1.With the incorporation of Eu^(3+),Cs_(2)NaTbGd_(0.35)Tb_(0.6)Eu_(0.05)Cl_(6)exhibits excellent thermal and radiation stability for scintillation.Moreover,DPLCs embedded in polymethyl methacrylate(PMMA)scintillator films enable high-resolution X-ray imaging with a spatial resolution of 16.6 lp mm-1.This work provides a novel strategy for designing DPLCs with state-of-the-art optical applications.展开更多
基金supported by the National Natural Science Foundation of China(52172164,62475248,and 12404468)the Zhejiang Provincial Natural Science Foundation of China under Grant No.LQN25E020001.
文摘Double-perovskite materials with diverse elemental compositions have been developed as high-performance phosphors and scintillators.However,the low doping concentration of activator ions in the host matrix limits the flexible tuning of luminescence properties.In this work,we propose a series of gadolinium,terbium,and europium alloyed double-perovskite lanthanide chlorides(DPLCs)to achieve colortunable photoluminescence(PL)as well as thermally and radiationally stable X-ray excited optical luminescence(XEOL).The Cs_(2)NaGdCl_(6)host allows up to 100%and 60%doping concentrations of Tb^(3+)ions for PL and XEOL,respectively,without concentration quenching.The designed Cs_(2)NaTbCl_(6)exhibits a high photoluminescence quantum yield of 73.5%.Optical encryption was achieved using Cs_(2)NaTb_(0.95)Eu_(0.05)Cl_(6),which shows excitation-wavelength-dependent dynamic emission colors.Benefiting from efficient energy transfer from Gd^(3+)to Tb^(3+)in the XEOL process,Cs_(2)NaGd_(0.4)Tb_(0.6)Cl_(6)achieves a high light yield of 27000 ph MeV-1.With the incorporation of Eu^(3+),Cs_(2)NaTbGd_(0.35)Tb_(0.6)Eu_(0.05)Cl_(6)exhibits excellent thermal and radiation stability for scintillation.Moreover,DPLCs embedded in polymethyl methacrylate(PMMA)scintillator films enable high-resolution X-ray imaging with a spatial resolution of 16.6 lp mm-1.This work provides a novel strategy for designing DPLCs with state-of-the-art optical applications.
