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Imbedded Nanocrystals of CsPbBr 3 in Cs 4 PbBr 6 : Kinetics, Enhanced Oscillator Strength, and Application in Light‐Emitting Diodes
Author(s) -
Xu Junwei,
Huang Wenxiao,
Li Peiyun,
Onken Drew R.,
Dun Chaochao,
Guo Yang,
Ucer Kamil B.,
Lu Chang,
Wang Hongzhi,
Geyer Scott M.,
Williams Richard T.,
Carroll David L.
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201703703
Subject(s) - materials science , nanocrystal , perovskite (structure) , kinetics , oscillator strength , exciton , diode , nanosecond , composite number , optoelectronics , laser , optics , nanotechnology , crystallography , composite material , condensed matter physics , chemistry , physics , quantum mechanics , astronomy , spectral line
Solution‐grown films of CsPbBr 3 nanocrystals imbedded in Cs 4 PbBr 6 are incorporated as the recombination layer in light‐emitting diode (LED) structures. The kinetics at high carrier density of pure (extended) CsPbBr 3 and the nanoinclusion composite are measured and analyzed, indicating second‐order kinetics in extended and mainly first‐order kinetics in the confined CsPbBr 3 , respectively. Analysis of absorption strength of this all‐perovskite, all‐inorganic imbedded nanocrystal composite relative to pure CsPbBr 3 indicates enhanced oscillator strength consistent with earlier published attribution of the sub‐nanosecond exciton radiative lifetime in nanoprecipitates of CsPbBr 3 in melt‐grown CsBr host crystals and CsPbBr 3 evaporated films.