Color-Pure Violet-Light-Emitting Diodes Based on Layered Lead Halide Perovskite Nanoplates
Violet electroluminescence is rare in both inorganic and organic light-emitting diodes (LEDs). Low-cost and room- temperature solution-processed lead halide perovskites with high- efficiency and color-tunable photoluminescence are promising for LEDs. Here, we report room-temperature color-pure violet LEDs based on a two-dimensional lead halide perovskite material, namely, 2-phenylethylammonium (C 6H 5CH 2CH 2NH 3 +, PEA) lead bromide [(PEA) 2PbBr 4]. The natural quantum confinement of two-dimen- sional layered perovskite (PEA) 2PbBr 4 allows for photoluminescence of shorter wavelength (410 nm) than its three-dimensional counterpart. By converting as-deposited polycrystalline thin films to micrometer-sized (PEA) 2PbBr 4 nanoplates using solvent vapor annealing, we successfully integrated this layered perovskite material into LEDs and achieved efficient room-temperature violet electroluminescence at 410 nm with a narrow bandwidth. This conversion to nanoplates significantly enhanced the crystallinity and photophysical properties of the (PEA) 2PbBr 4 samples and the external quantum efficiency of the violet LED. Finally, the solvent vapor annealing method reported herein can be generally applied to other perovskite materials to increase their grain size and, ultimately, improve the performance of optoelectronic devices based on perovskite materials.
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- Univ. of Wisconsin, Madison, WI (United States). Dept. of Chemistry
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Electrical and Computer Engineering
- Publication Date:
- Grant/Contract Number:
- FG02-09ER46664; FA9550-14-1-0128; SC0002162
- Type:
- Published Article
- Journal Name:
- ACS Nano
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 7; Journal ID: ISSN 1936-0851
- Publisher:
- American Chemical Society
- Research Org:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY; layered perovskite; violet-light-emitting diode (LED); solvent vapor annealing; nanoplate
- OSTI Identifier:
- 1259570
- Alternate Identifier(s):
- OSTI ID: 1281965