Recombination Dynamics Study on Nanostructured Perovskite Light-Emitting Devices

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Ziming Chen
  • Zhenchao Li
  • Chongyang Zhang
  • Xiao-Fang Jiang
  • Dongcheng Chen
  • Qifan Xue
  • Meiyue Liu
  • Shijian Su
  • Yong Cao

Detail(s)

Original languageEnglish
Article number1801370
Journal / PublicationAdvanced Materials
Volume30
Issue number38
Publication statusPublished - 20 Sept 2018
Externally publishedYes

Abstract

The field of organic–inorganic hybrid perovskite light-emitting diodes (PeLEDs) has developed rapidly in recent years. Although the performance of PeLEDs continues to improve through film quality control and device optimization, little research has been dedicated to understanding the recombination dynamics in perovskite thin films. Likewise, little has been done to investigate the effects of recombination dynamics on the overall light-emitting behavior of PeLEDs. Therefore, this study investigates the recombination dynamics of CH3NH3PbI3 thin films with differing crystal sizes by measurement of fluence-dependent transient absorption dynamics and time-resolved photoluminescence. The aim is to find out the link between recombination dynamics and device behavior in PeLEDs. It is found that bimolecular and Auger recombination become more efficient as the crystal size decreases and monomolecular recombination rate is affected by the trap density of perovskite. By defining the radiative efficiency Φ(n), which relates to the monomolecular, bimolecular, and Auger recombination, the fundamental recombination properties of CH3NH3PbI3 films are discerned in quantitative terms. These findings help us to understand the light emission behavior of PeLEDs. This study takes an important step toward establishing the relationship between film structure, recombination dynamics, and device behavior for PeLEDs, thereby providing useful insights toward the design of better perovskite devices.

Research Area(s)

  • crystal sizes, organic–inorganic hybrid perovskite LEDs, prediction, radiative efficiency, recombination dynamics

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Recombination Dynamics Study on Nanostructured Perovskite Light-Emitting Devices. / Chen, Ziming; Li, Zhenchao; Zhang, Chongyang et al.
In: Advanced Materials, Vol. 30, No. 38, 1801370, 20.09.2018.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review