View : 844 Download: 0
Perovskite energy funnels for efficient light-emitting diodes
- Title
- Perovskite energy funnels for efficient light-emitting diodes
- Authors
- Yuan, Mingjian; Li Na Quan; Comin, Riccardo; Walters, Grant; Sabatini, Randy; Voznyy, Oleksandr; Hoogland, Sjoerd; Zhao, Yongbiao; Beauregard, Eric M.; Kanjanaboos, Pongsakorn; Lu, Zhenghong; Kim, Dong Ha; Sargent, Edward H.
- Ewha Authors
- 김동하
- SCOPUS Author ID
- 김동하
- Issue Date
- 2016
- Journal Title
- NATURE NANOTECHNOLOGY
- ISSN
- 1748-3387
1748-3395
- Citation
- NATURE NANOTECHNOLOGY vol. 11, no. 10, pp. 872 - +
- Publisher
- NATURE PUBLISHING GROUP
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Organometal halide perovskites exhibit large bulk crystal domain sizes, rare traps, excellent mobilities and carriers that are free at room temperature-properties that support their excellent performance in charge-separating devices. In devices that rely on the forward injection of electrons and holes, such as light-emitting diodes (LEDs), excellent mobilities contribute to the efficient capture of non-equilibrium charge carriers by rare non-radiative centres. Moreover, the lack of bound excitons weakens the competition of desired radiative (over undesired non-radiative) recombination. Here we report a perovskite mixed material comprising a series of differently quantum-size-tuned grains that funnels photoexcitations to the lowest-bandgap light-emitter in the mixture. The materials function as charge carrier concentrators, ensuring that radiative recombination successfully outcompetes trapping and hence non-radiative recombination. We use the new material to build devices that exhibit an external quantum efficiency (EQE) of 8.8% and a radiance of 80 W sr(-1) m(-2). These represent the brightest and most efficient solution-processed near-infrared LEDs to date.
- DOI
- 10.1038/NNANO.2016.110
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML