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Picosecond absorption spectroscopy of self-trapped excitons and transient Ce states in LaBr3 and LaBr3 :Ce

https://doi.org/10.1103/PhysRevB.97.144303

Li, Peiyun ; Gridin, Sergii ; Ucer, K. Burak ; Williams, Richard T. ; Menge, Peter R. ( April 2018 , Physical Review B)
Polymer Gating White Flexible Field-Induced Lighting Device

https://doi.org/10.1002/admt.201700017

Xu, Junwei ; Carroll, David L. ; Shao, Linqi ; Li, Peiyun ; Dun, Chaochao ; Nolan, Lili V. ( August 2017 , Advanced Materials Technologies)
Imbedded Nanocrystals of CsPbBr 3 in Cs 4 PbBr 6 : Kinetics, Enhanced Oscillator Strength, and Application in Light‐Emitting Diodes

https://doi.org/10.1002/adma.201703703

Xu, Junwei ; Huang, Wenxiao ; Li, Peiyun ; Onken, Drew R. ; Dun, Chaochao ; Guo, Yang ; Ucer, Kamil B. ; Lu, Chang ; Wang, Hongzhi ; Geyer, Scott M. ; et al ( October 2017 , Advanced Materials)

Abstract
Solution‐grown films of CsPbBr₃nanocrystals imbedded in Cs₄PbBr₆are incorporated as the recombination layer in light‐emitting diode (LED) structures. The kinetics at high carrier density of pure (extended) CsPbBr₃and the nanoinclusion composite are measured and analyzed, indicating second‐order kinetics in extended and mainly first‐order kinetics in the confined CsPbBr₃, respectively. Analysis of absorption strength of this all‐perovskite, all‐inorganic imbedded nanocrystal composite relative to pure CsPbBr₃indicates enhanced oscillator strength consistent with earlier published attribution of the sub‐nanosecond exciton radiative lifetime in nanoprecipitates of CsPbBr₃in melt‐grown CsBr host crystals and CsPbBr₃evaporated films.

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