Affiliation:
1. Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials Siyuan Laboratory Department of Physics Jinan University Guangzhou 510632 P. R. China
2. Department of Physics, Chemistry, and Biology (IFM) Linköping University Linköping 58183 Sweden
3. Laboratory of Organic Electronics Department of Science and Technology Linköping University Norrköping 60174 Sweden
Abstract
AbstractThe development of highly efficient blue perovskite light‐emitting diodes (PeLEDs) remains a big challenge, requiring more fundamental investigations. In this work, significant photoluminescence enhancement in mixed halide blue perovskite films is demonstrated by using a molecule, benzylphosphonic acid, which eventually doubles the external quantum efficiency to 6.3% in sky‐blue PeLEDs. The photoluminescence enhancement is achieved by forming an oxide‐bonded perovskite surface at grain boundaries and suppressing electron–phonon interaction, which enhances the radiative recombination rate and reduces the nonradiative recombination rate, respectively. Moreover, severe thermal quenching is observed in the blue perovskite films, which can be explained by a two‐step mechanism involving exciton dissociation and electron–phonon interaction. The results suggest that enhancing the radiative recombination rate and reducing the electron–phonon interaction‐induced nonradiative recombination rate are crucial for achieving blue perovskite films with strong emission at or above room temperature.
Funder
China Postdoctoral Science Foundation
National Natural Science Foundation of China
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
9 articles.
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