Zn-Alloyed CsPbI 3 Nanocrystals for Highly Efficient Perovskite Light-Emitting Devices

We alloyed Zn2+ into CsPbI3 perovskite nanocrystals by partial substitution of Pb2+ with Zn2+, which does not change their crystalline phase. The resulting alloyed CsPb0.64Zn0.36I3 nanocrystals exhibited an improved, close-to-unity photoluminescence quantum yield of 98.5% due to the increased radiative decay rate and the decreased non-radiative decay rate. They also showed an enhanced stability, which correlated with improved effective Goldschmidt tolerance factors, by the incorporation of Zn2+ ions with a smaller radius than the Pb2+ ions. Simultaneously, the nanocrystals switched from n-type (for CsPbI3) to nearly ambipolar for the alloyed nanoparticles. The hole injection barrier of electroluminescent LEDs…

• NN
  National Natural Science Foundation of China

  Awards: 61675086, 51772123, 61722504, 51702115, 61475062, 11674127
• MO
  Ministry of Science and Technology of the People's Republic of China

  Award: 2017YFB0403601
• CP
  China Postdoctoral Science Foundation

  Award: 2017M611319
• RG
  Research Grants Council, University Grants Committee

  Award: CityU11337616
• SA
  State Administration of Foreign Experts Affairs

  Award: MSBJLG040
• PG
  People's Government of Jilin Province

  Award: 20170520129JH
• JU
  Jilin University

  Award: SXGJXX2017-3
• MO
  Ministry of Human Resources and Social Security

  Award: BX201600060
• LS
  Louisiana State University Shreveport
• NI
  National Institute of General Medical Sciences

  Award: P20GM103424