摘要
Double perovskites(DPs)with Cs_(2)AgInCl_(6) composition,as one of the lead-free perovskites,have been in the spotlight owing to their intriguing optical properties,namely,self-trapped exciton(STE)emission and dopant-induced photoluminescence.However,the current DPs still face the challenge of low photoluminescence efficiency and cannot be applied in practice.Herein,we synthesize the Bi^(3+)and Eu^(3+)codoped Cs_(2)AgInCl_(6) DPs,which displays enhanced STE and Eu^(3+)ions characteristic emissions.Our results indicate that the Eu^(3+)ions mainly substitute the In sites and can increase the radiative recombination rate and exciton binding energy of STEs,which is discovered that Eu^(3+)ions can promote the localization of STEs by breaking the inversion symmetry of the Cs_(2)AgInCl_(6) lattice.The existence of Bi^(3+)ions decreases the excitation(absorption)energy,provides a new absorption channel,and increases the energy transfer rate to Eu^(3+)ions.Through adjusting the Bi^(3+)and Eu^(3+)concentrations,a maximum photoluminescence quantum yield of 80.1%is obtained in 6%Eu^(3+)and 0.5%Bi^(3+)codoped Cs_(2)AgInCl_(6) DPs.Finally,the high-quality single-component white-light-emitting diodes based on Bi^(3+)and Eu^(3+)codoped Cs_(2)AgInCl_(6) DPs and a 410-nm commercial ultraviolet chip are fabricated with the optimum color rendering index of 89,the optimal luminous efficiency of 88.1 lm/W,and a half-lifetime of 1,493 h.This work puts forward an effective lanthanide and transition metals codoping strategy to design single-component white-light emitter,taking a big step forward for the application lead-free DPs.
基金
National Key R&D Program of China(2021YFB3500400)
National Natural Science Foundation of China(Grant No.12174152)
Special Project of the Province-University Co-constructing Program of Jilin Province(SXGJXX2017-3)
Jilin Province Natural Science Foundation of China(Nos.202513JC010277746 and 20190201307JC)
Education Department of Jilin Province Project(JJKH20221004KJ)
Interdisciplinary Integration and Innovation Project of JLU(JLUXKJC2021QZ14)
China Postdoctoral Science Foundation(2021M701381)
Jilin Province Science and Technology Innovation and Entrepreneurship Project for Overseas Students.
