Imbedded Nanocrystals of CsPbBr<sub>3</sub> in Cs<sub>4</sub> PbBr<sub>6</sub> : Kinetics, Enhanced Oscillator Strength, and Application in Light-Emitting Diodes.
basic_science · Level V
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- Record sourced from PubMed, PMID 29024076.
- Also identified by DOI 10.1002/adma.201703703.
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Abstract
Solution-grown films of CsPbBr<sub>3</sub> nanocrystals imbedded in Cs<sub>4</sub> PbBr<sub>6</sub> are incorporated as the recombination layer in light-emitting diode (LED) structures. The kinetics at high carrier density of pure (extended) CsPbBr<sub>3</sub> and the nanoinclusion composite are measured and analyzed, indicating second-order kinetics in extended and mainly first-order kinetics in the confined CsPbBr<sub>3</sub> , respectively. Analysis of absorption strength of this all-perovskite, all-inorganic imbedded nanocrystal composite relative to pure CsPbBr<sub>3</sub> indicates enhanced oscillator strength consistent with earlier published attribution of the sub-nanosecond exciton radiative lifetime in nanoprecipitates of CsPbBr<sub>3</sub> in melt-grown CsBr host crystals and CsPbBr<sub>3</sub> evaporated films.