Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 29, Issue 40, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201903861
Keywords
deep-blue emission; perovskite light communication; perovskite light-emitting diodes; perovskite nanocrystals; Ruddlesden-Popper perovskite
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Funding
- National Basic Research Program of China [2016YFA0202400]
- National Natural Science Foundation of China [51672180, 51622306, 51821002, 91833303, 21673151]
- Natural Science Foundation of Jiangsu Province of China [BK20180845]
- Qing Lan Project
- 111 project
- Collaborative Innovation Center of Suzhou Nano Science and Technology (Nano-CIC)
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Ruddlesden-Popper perovskite, (PEA)(2)PbBr4 (PEA = C8H9NH3), is a steady and inexpensive material with a broad bandgap and a narrow-band emission. These features make it a potential candidate for deep-blue light-emitting diodes (LEDs). However, due to the weak exciton binding energy, LEDs based on the perovskite thin films usually possess a very low external quantum efficiency (EQE) of <0.03%. Here, for the first time, the construction of high-performance deep-blue LEDs based on 2D (PEA)(2)PbBr4 nanoplates (NPs) is demonstrated. The as-fabricated (PEA)(2)PbBr4 NPs film shows a deep-blue emission at 410 nm with excellent stability under ambient conditions. Impressively, LEDs based on the (PEA)(2)PbBr4 NPs film deliver a bright deep-blue emission with a maximum luminance of 147.6 cd m(-2) and a high EQE up to 0.31%, which represents the most efficient and brightest perovskite LEDs operating at deep-blue wavelengths. Furthermore, the LEDs retain over 80% of their efficiencies for over 1350 min under approximate to 60% relative humidity. The steady and bright deep-blue LEDs can be used as an excitation light source to realize white light emission, which shows the potential for light communication. The work provides scope for developing perovskite into efficient and deep-blue LEDs for low-cost light source and light communication.
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