Realization of Highly Efficient InP Quantum Dot Light-Emitting Diodes through In-Depth Investigation of Exciton-Harvesting Layers
- Authors
- Kim, Jaeyoul; Hong, Ahyoung; Hahm, Donghyo; Lee, Hyunkoo; Bae, Wan Ki; Lee, Taesoo; Kwak, Jeonghun
- Issue Date
- Apr-2023
- Publisher
- John Wiley and Sons Inc
- Keywords
- current efficiency; energy transfer; exciton-harvesting layer; high luminance; quantum dot light-emitting diodes
- Citation
- Advanced Optical Materials, v.11, no.8, pp 1 - 7
- Pages
- 7
- Journal Title
- Advanced Optical Materials
- Volume
- 11
- Number
- 8
- Start Page
- 1
- End Page
- 7
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/151884
- DOI
- 10.1002/adom.202300088
- ISSN
- 2195-1071
2195-1071
- Abstract
- Quantum dot light-emitting diodes (QLEDs) are considered promising candidates for several optoelectronic applications; however, they are plagued by the over-injection of electrons compared to holes, which limits device efficiency. Studies have attempted to reuse the leaked electrons and transfer recombination energies via inserting an exciton-harvesting layer (EHL) between the emissive layer (EML) and hole transport layer (HTL). This study conducts a detailed analysis of the energy transfer mechanisms to obtain better insights into improving the device performance. First, by analyzing the electroluminescence (EL) spectra and exciton dynamics, the effect of EHLs comprising phosphorescence (PH) or thermally activated delayed fluorescence (TADF) blue dopant is compared. Through parallel incorporation of those EHLs on QLEDs and organic LEDs, the minimal contribution of the PH-EHL to energy transfer in QLEDs is confirmed, whereas the TADF-EHL has a significant contribution. Second, highly efficient top-emission green QLEDs with the TADF-EHL are achieved. They exhibit a maximum luminance (L) and current efficiency (CE) of 40700 cd m−2 and 68.0 cd A−1, respectively, which are the highest among the reported values for green-emitting InP QLEDs. The proposed approaches are expected to provide aid in the realization of highly efficient QLEDs from the analysis to the device optimization stage. © 2023 Wiley-VCH GmbH.
- Files in This Item
-
Go to Link
- Appears in
Collections - ICT융합공학부 > 전자공학전공 > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.