Highly efficient quasi-two dimensional perovskite light-emitting diodes by phase tuning |
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| Affiliation: | 1. School of Physical Science and Technology, MOE Key Laboratory on Luminescence and Real Time Analysis, Southwest University, Chongqing, 400715, China;2. Nanoscience Technology Center, University of Central Florida, Orlando, FL, 32826, USA;3. Department of Materials Science & Engineering, University of Central Florida, Orlando, FL, 32816, USA;4. College of Optics and Photonics, University of Central Florida, Orlando, FL, 32816, USA;5. Soochow Institute for Energy and Materials InnovationS (SIEMIS), College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, 215006, China;1. Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau SAR, China;2. Department of Physics, Hong Kong Baptist University, Kowloon, Hong Kong SAR, China |
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| Abstract: | Tetraphenylphosphonium chloride (TPPCl) is used as an additive in the antisolvent for preparing the quasi-two Dimensional (quasi-2D) perovskite film. This strategy is not only beneficial for the morphology formation but also the phase tuning of the quasi-2D perovskite film. Highly efficient and stable perovskite light-emitting diodes (PeLEDs) were achieved with the maximum luminance of 35,000 cd/m2, the maximum current efficiency of 48.0 cd/A and the maximum external quantum efficiency (EQE) of 12.42%. Due to the reduced exciton quenching rate, improved charge carrier injection and transport ability, the electroluminescent performance of the TPPCl-based PeLEDs has been enhanced. |
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| Keywords: | Tetraphenylphosphonium chloride Phase tuning Pinhole-free Additive-based antisolvent Light-emitting diodes |
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