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Efficient green light-emitting diodes based on quasi-two-dimensional composition and phase engineered perovskite with surface passivation
- Source :
- Nature Communications, Vol 9, Iss 1, Pp 1-8 (2018), Nature Communications
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- Perovskite light-emitting diodes (LEDs) are attracting great attention due to their efficient and narrow emission. Quasi-two-dimensional perovskites with Ruddlesden–Popper-type layered structures can enlarge exciton binding energy and confine charge carriers and are considered good candidate materials for efficient LEDs. However, these materials usually contain a mixture of phases and the phase impurity could cause low emission efficiency. In addition, converting three-dimensional into quasi-two-dimensional perovskite introduces more defects on the surface or at the grain boundaries due to the reduction of crystal sizes. Both factors limit the emission efficiency of LEDs. Here, firstly, through composition and phase engineering, optimal quasi-two-dimensional perovskites are selected. Secondly, surface passivation is carried out by coating organic small molecule trioctylphosphine oxide on the perovskite thin film surface. Accordingly, green LEDs based on quasi-two-dimensional perovskite reach a current efficiency of 62.4 cd A−1 and external quantum efficiency of 14.36%.<br />Solution-processable halide perovskites have high luminous efficiency and excellent chemical tunability, making them ideal candidates for light-emitting diodes. Here Yang et al. achieve high external quantum efficiency of 14% in the devices by fine-tuning the phase and passivating the surface defects.
- Subjects :
- Materials science
Passivation
Science
General Physics and Astronomy
02 engineering and technology
Green-light
010402 general chemistry
01 natural sciences
Article
General Biochemistry, Genetics and Molecular Biology
law.invention
law
OLED
Thin film
lcsh:Science
Author Correction
Perovskite (structure)
Multidisciplinary
business.industry
General Chemistry
021001 nanoscience & nanotechnology
0104 chemical sciences
Optoelectronics
lcsh:Q
Quantum efficiency
Charge carrier
0210 nano-technology
business
Light-emitting diode
Subjects
Details
- ISSN :
- 20411723
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- Nature Communications
- Accession number :
- edsair.doi.dedup.....7149658d9a91df39eb0fbf3432ef987f