Eliminating Chlorine Vacancies of Perovskite Nanocrystals Using Hydrazine Cations Enables Efficient Pure Blue Light-Emitting Diodes
Source abstract
Abstract
Mixed Br/Cl-perovskite nanocrystals (Pe-NCs) CsPbBr x Cl 3– x, synthesized at room temperature (RT), offer several advantages for use in light-emitting diodes (LEDs), including cost-effective processing and a narrow luminescence peak. However, achieving efficient pure blue LEDs using CsPbBr x Cl 3– x NCs has been proven to be challenging due to a significant number of chlorine defects. In this work, we propose a passivation strategy utilizing hydrazine cations (Hz 2+ ) to eliminate chlorine defects in RT-synthesized Pe-NCs. Our investigation reveals that Hz 2+ can capture the isolated chlorine anion (Cl – ) to form a Hz–Cl–Cs bridge on the Pe-NC surface, thereby effectively inhibiting the formation of chlorine vacancies. This approach significantly enhances both the photoluminescence efficiency and lifetime of Pe-NCs. Consequently, LEDs fabricated using Hz 2+ -passivated Pe-NCs achieve an outstanding external quantum efficiency (EQE) of 7.82% at 475 nm. Our findings highlight an effective passivation strategy that significantly mitigates chlorine defects in Pe-NCs, thereby advancing the development of efficient pure blue LEDs.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Quantum Dots Synthesis And Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, People’s Republic of China
Sichuan Research Center of New Materials Institute of Chemical Materials, China Academy of Engineering Physics, Chengdu 610200, People’s Republic of China
School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, People’s Republic of China
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094 People’s Republic of China
Southwest Joint Research Institute, School of Materials and Energy, Yunnan University, Kunming 650000, People’s Republic of China
Funding
Nanjing University of Science and Technology · Fundamental Research Funds for the Central Universities · National Natural Science Foundation of China
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