期刊
NATURE PHOTONICS
卷 14, 期 2, 页码 70-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41566-019-0545-9
关键词
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资金
- Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project under JST ERATO grant, Japan [JPMJER1305]
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER) - Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Canon Foundation
- Changchun Institute of Applied Chemistry (CIAC)
- MEST
- POSTECH
- JST-CREST [JPMJCR16N3]
- CNRS, France [PICS N8 8085]
Careful harvesting of triplet excitons allows the realization of efficient green-emitting quasi-2D perovskite LEDs. Perovskite light-emitting diodes are promising for next-generation lighting and displays because of their high colour purity and performance(1). Although the management of singlet and triplet excitons is fundamental to the design of efficient organic light-emitting diodes, the nature of how excitons affect performance is still not clear in perovskite(2-4) and quasi-two-dimensional (2D) perovskite-based devices(5-9). Here, we show that triplet excitons are key to efficient emission in green quasi-2D perovskite devices and that quenching of triplets by the organic cation is a major loss path. Employing an organic cation with a high triplet energy level (phenylethylammonium) in a quasi-2D perovskite based on formamidinium lead bromide yields efficient harvesting of triplets. Furthermore, we show that upconversion of triplets to singlets can occur, making 100% harvesting of electrically generated excitons potentially possible. The external quantum and current efficiencies of our green (527 nm) devices reached 12.4% and 52.1 cd A(-1), respectively.
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