Perovskite Light‐Emitting Diodes with Improved Outcoupling Using a High‐Index Contrast Nanoarray
Abstract
Organic–inorganic hybrid perovskite light‐emitting diodes (PeLEDs) are promising for next‐generation optoelectronic devices due to their potential to achieve high color purity, efficiency, and brightness. Although the external quantum efficiency (EQE) of PeLEDs has recently surpassed 20%, various strategies are being pursued to increase EQE further and reduce the EQE gap compared to other LED technologies. A key point to further boost EQE of PeLEDs is linked to the high refractive index of the perovskite emissive layer, leading to optical losses of more than 70% of emitted photons. Here, it is demonstrated that a randomly distributed nanohole array with high‐index contrast can effectively enhance outcoupling efficiency in PeLEDs. Based on a comprehensive optical analysis on the perovskite thin film and outcoupling structure, it is confirmed that the nanohole array effectively distributes light into the substrate for improved outcoupling, allowing for 1.64 times higher light extraction. As a result, highly efficient red/near‐infrared PeLEDs with a peak EQE of 14.6% are demonstrated.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 30, 2019
- Source ID
- 10.1002/smll.201900135
Entities
People
- Barry P Rand
- Hyeokjung Kang
- Jeong-Hwan Lee
- Ji Whan Kim
- Jun‐ho Jeong
- Lianfeng Zhao
- Sei‐yong Kim
- Sohee Jeon
- Young‐jin Jung
Organizations
- Air Force Office of Scientific Research
- Inha University
- Ministry of Science, ICT and Future Planning
- National Research Foundation of Korea
- Princeton University
- Samsung Electronics