Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-019-08425-5
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Funding
- National Natural Science Foundation of China [51675322, 61605109, 61735004, 51702115]
- National Key Research and Development Program of China [2016YFB0401702]
- National Natural Science Foundation of China/Research Grants Council Joint Research Scheme [N_CityU108/17]
- Shanghai Rising-Star Program [17QA1401600]
- Program for Professors of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [TP2015037]
- National Postdoctoral Program for Innovative Talents [BX201600060]
- NSFC/RGC [N_CityU108/17]
- Talent Introduction Plan of Overseas Top Ranking Professors by the State Administration of Foreign Expert Affairs [MSBJLG040]
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Quantum efficiencies of organic-inorganic hybrid lead halide perovskite light-emitting devices (LEDs) have increased significantly, but poor device operational stability still impedes their further development and application. All-inorganic perovskites show better stability than the hybrid counterparts, but the performance of their respective films used in LEDs is limited by the large perovskite grain sizes, which lowers the radiative recombination probability and results in grain boundary related trap states. We realize smooth and pinhole-free, small-grained inorganic perovskite films with improved photoluminescence quantum yield by introducing trifluoroacetate anions to effectively passivate surface defects and control the crystal growth. As a result, efficient green LEDs based on inorganic perovskite films achieve a high current efficiency of 32.0 cd A(-1) corresponding to an external quantum efficiency of 10.5%. More importantly, our all-inorganic perovskite LEDs demonstrate a record operational lifetime, with a half-lifetime of over 250 h at an initial luminance of 100 cd m(-2).
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