Due to their environmental friendliness,structural plasticity,and tunable emission,lead-free halide double perovskites offer a broad spectrum of applications in light-emitting diode(LED),photodetectors,infrared imagin...Due to their environmental friendliness,structural plasticity,and tunable emission,lead-free halide double perovskites offer a broad spectrum of applications in light-emitting diode(LED),photodetectors,infrared imaging,and temperature sensing.Herein,we synthesized rare earth-based Cs_(2)NaYCl_(6)double perovskites using a solvothermal method,and Sb^(3+)/Sm^(3+)co-doping can effectively modulate the luminescence by adjusting the band gap structure and channels of energy transfer.With the Sm^(3+)-feeding concentration increasing,the emission could be adjusted from blue to white,attributed to an effective energy transfer from the self-trapped state to Sm^(3+).Temperature-dependent photoluminescence spectra indicate that the double self-trapped exciton emission at low temperatures originated from two minima in the excited state of 3P1.The relative sensitivity of the optical temperature sensor reached 1.08%K^(-1),which was better than that of other rare earth perovskites.The LED device based on Sb^(3+)/Sm^(3+)co-doped Cs_(2)NaYCl_(6)@polymethylmethacrylate displays a chromaticity coordinate of(0.29,0.28),a color rendering index of 87,and the correlated color temperature of 10986 K.Our work explores an in-depth understanding of energy transfer in double self-trapped states and provides new material for advanced applications.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.52162021 and 22175043)Open Foundation of State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures(Grant No.MMCS2023OF05)Guangxi Science and Technology Plan Project(Guike AA23073018).
文摘Due to their environmental friendliness,structural plasticity,and tunable emission,lead-free halide double perovskites offer a broad spectrum of applications in light-emitting diode(LED),photodetectors,infrared imaging,and temperature sensing.Herein,we synthesized rare earth-based Cs_(2)NaYCl_(6)double perovskites using a solvothermal method,and Sb^(3+)/Sm^(3+)co-doping can effectively modulate the luminescence by adjusting the band gap structure and channels of energy transfer.With the Sm^(3+)-feeding concentration increasing,the emission could be adjusted from blue to white,attributed to an effective energy transfer from the self-trapped state to Sm^(3+).Temperature-dependent photoluminescence spectra indicate that the double self-trapped exciton emission at low temperatures originated from two minima in the excited state of 3P1.The relative sensitivity of the optical temperature sensor reached 1.08%K^(-1),which was better than that of other rare earth perovskites.The LED device based on Sb^(3+)/Sm^(3+)co-doped Cs_(2)NaYCl_(6)@polymethylmethacrylate displays a chromaticity coordinate of(0.29,0.28),a color rendering index of 87,and the correlated color temperature of 10986 K.Our work explores an in-depth understanding of energy transfer in double self-trapped states and provides new material for advanced applications.
