Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes
- Title
- Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes
- Author
- 김영훈
- Issue Date
- 2021-01
- Publisher
- NATURE RESEARCH
- Citation
- NATURE PHOTONICS, v. 15, no. 2, page. 148-155
- Abstract
- Electroluminescence efficiencies of metal halide perovskite nanocrystals (PNCs) are limited by a lack of material strategies that can both suppress the formation of defects and enhance the charge carrier confinement. Here we report a one-dopant alloying strategy that generates smaller, monodisperse colloidal particles (confining electrons and holes, and boosting radiative recombination) with fewer surface defects (reducing non-radiative recombination). Doping of guanidinium into formamidinium lead bromide PNCs yields limited bulk solubility while creating an entropy-stabilized phase in the PNCs and leading to smaller PNCs with more carrier confinement. The extra guanidinium segregates to the surface and stabilizes the undercoordinated sites. Furthermore, a surface-stabilizing 1,3,5-tris(bromomethyl)-2,4,6-triethylbenzene was applied as a bromide vacancy healing agent. The result is highly efficient PNC-based light-emitting diodes that have current efficiency of 108 cd A−1 (external quantum efficiency of 23.4%), which rises to 205 cd A−1 (external quantum efficiency of 45.5%) with a hemispherical lens.
- URI
- https://www.nature.com/articles/s41566-020-00732-4https://repository.hanyang.ac.kr/handle/20.500.11754/175541
- ISSN
- 1749-4885; 1749-4893
- DOI
- 10.1038/s41566-020-00732-4
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML