Manipulation of Hole and Exciton Distributions in Organic Light-Emitting Diodes with Dual Emission Layers

The efficiency improvement of organic light-emitting diodes (OLEDs) is important but challenging. Here, we introduce a unique OLED with a hole modulation layer (HML) in the middle of its emission layer (EML). The external quantum efficiency and power efficiency can be improved by approximately 58% w...

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Veröffentlicht in:	Electronic materials letters 2024, 20(3), , pp.232-242
Hauptverfasser:	Song, Suk-Ho, Yoo, Jae-In, Kim, Hyo-Bin, Kang, Sung-Cheon, Kim, Kanghoon, Park, Sung-Jae, Yan, Qun, Song, Jang-Kun
Format:	Artikel
Sprache:	eng
Schlagworte:	Characterization and Evaluation of Materials Chemistry and Materials Science Condensed Matter Physics Current density Efficiency Emission Excitons Light emitting diodes Low currents Magnetics and Photonics Materials Science Nanotechnology Nanotechnology and Microengineering Optical and Electronic Materials Organic light emitting diodes Original Article - Electronics Power efficiency Quantum efficiency 전자/정보통신공학
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Beschreibung
Zusammenfassung:	The efficiency improvement of organic light-emitting diodes (OLEDs) is important but challenging. Here, we introduce a unique OLED with a hole modulation layer (HML) in the middle of its emission layer (EML). The external quantum efficiency and power efficiency can be improved by approximately 58% when an HML with optimized thickness is inserted. HML insertion can efficiently retard hole flow, thus improving ( i ) exciton distribution uniformity and ( ii ) local electron–hole charge balance. A systematic study of the individual contributions of two EMLs separated by the HML shows that the former factor dominantly works at low current densities (
ISSN:	1738-8090 2093-6788
DOI:	10.1007/s13391-023-00452-1