Hybrid organic–inorganic perovskite semiconductors have shown potential to develop into a new generation of light-emitting diode (LED) technology. Herein, an important design principle for perovskite LEDs is elucidated regarding optimal perovskite thickness. Adopting a thin perovskite layer in the range of 35–40 nm is shown to be critical for both device efficiency and stability improvements. Maximum external quantum efficiencies (EQEs) of 17.6% for Cs0.2FA0.8PbI2.8Br0.2, 14.3% for CH3NH3PbI3 (MAPbI3), 10.1% for formamidinium lead iodide (FAPbI3), and 11.3% for formamidinium lead bromide (FAPbBr3)-based LEDs are demonstrated with optimized perovskite layer thickness. Optical simulations show that the improved EQEs source from improved light outcoupling. Furthermore, elevated device temperature caused by Joule heating is shown as an important factor contributing to device degradation, and that thin perovskite emitting layers maintain lower junction temperature during operation and thus demonstrate increased stability.
Bibliographical noteFunding Information:
This work was supported by the Air Force Office of Scientific Research under Award No. FA9550-18-1-0037 and the ONR Young Investigator Program under Award No. N00014-17-1-2005.
The authors would like to thank Prof. Claire Gmachl and Alexandra Werth for providing the thermal imaging camera, and Prof. Noel C. Giebink and Hoyeon Kim for helpful discussions on junction temperature extraction. This work was supported by the Air Force Office of Scientific Research under Award No. FA9550-18-1-0037 and the ONR Young Investigator Program under Award No. N00014-17-1-2005.
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
- Joule heating
- light outcoupling
- organic–inorganic hybrid perovskites
- perovskite light-emitting devices
- thermal management