Currently,a major challenge for metal-halide perovskite light emitting diodes(LEDs)is to achieve stable and efficient white light emission due to halide ion segregation.Herein,we report a promising method to fabricate white perovskite LEDs using lanthanide(Ln3+)ions doped CsPbCI3 perovskite nanocrystals(PeNCs).First,K+ions are doped into the lattice to tune the perovskite bandgap by partially substituting Cs+ions,which are well matched to the transition energy of some Ln3+ions from the ground state to the excited state,thereby greatly improving the F?rster energy transfer efficiency from excitons to Ln3+ions.Then,creatine phosphate(CP),a phospholipid widely found in organisms,serves as a tightly binding surface-capping multi-functional ligand which regulates the film formation and enhances the optical and electrical properties of PeNC film.Consequently,the Eu3+doped PeNCs based-white LEDs show a peak luminance of 1678 cd m-2 and a maximum external quantum efficiency(EQE)of 5.4％,demonstrating excellent performance among existing white PeNC LEDs from a single chip.Furthermore,the method of bandgap modulation and the defect passivation were generalized to other Ln3+ions doped perovskite LEDs and successfully obtained improved electroluminescence(EL).This work demonstrates the comprehensive and universal strategies in the realization of highly efficient and stable white LEDs via single-component Ln3+ions doped PeNCs,which provides an optimal solution for the development of low-cost and simple white perovskite LEDs.

Rui Sun;Donglei Zhou;Yujiao Ding;Yue Wang;Yuqi Wang;Xinmeng Zhuang;Shuainan Liu;Nan Ding;Tianyuan Wang;Wen Xu;Hongwei Song

State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,China

光：科学与应用（英文版）

[1]Rui Sun;Donglei Zhou;Yujiao Ding;Yue Wang;Yuqi Wang;Xinmeng Zhuang;Shuainan Liu;Nan Ding;Tianyuan Wang;Wen Xu;Hongwei Song-.Efficient single-component white light emitting diodes enabled by lanthanide ions doped lead halide perovskites via controlling F?rster energy transfer and specific defect clearance)[J].光：科学与应用（英文版）,2022(12):3044-3058

CsPbCI3,PeNCs,Cs+ions,Ln3+ions,PeNC,Eu3+doped

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