Journal article
Low-Temperature Cross-Linkable Hole Transport Materials for Solution-Processed Quantum Dot and Organic Light-Emitting Diodes with High Efficiency and Color Purity
ACS applied materials & interfaces, v 15(38), pp 45167-45176
27 Sep 2023
PMID: 37699415
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Cross-linkable hole transport materials (HTMs) are ideal for improving the performance of solution-processed quantum dot light-emitting diodes (QLEDs) and phosphorescent light-emitting diodes (OLEDs). However, previously developed cross-linkable HTMs possessed poor hole transport properties, high cross-linking temperatures, and long curing times. To achieve efficient cross-linkable HTMs with high mobility, low cross-linking temperature, and short curing time, we designed and synthesized a series of low-temperature cross-linkable HTMs comprising dibenzofuran (DBF) and 4-divinyltriphenylamine (TPA) segments for highly efficient solution-processed QLEDs and OLEDs. The introduction of divinyl-functionalized TPA in various positions of the DBF core remarkably affected their chemical, physical, and electrochemical properties. In particular, cross-linked 4-(dibenzo[b,d]furan-3-yl)-N,N-bis(4-vinylphenyl)aniline (3-CDTPA) exhibited a deep highest occupied molecular orbital energy level (5.50 eV), high hole mobility (2.44 × 10–4 cm2 V–1 s–1), low cross-linking temperature (150 °C), and short curing time (30 min). Furthermore, a green QLED with 3-CDTPA as the hole transport layer (HTL) exhibited a notable maximum external quantum efficiency (EQEmax) of 18.59% with a remarkable maximum current efficiency (CEmax) of 78.48 cd A–1. In addition, solution-processed green OLEDs with 3-CDTPA showed excellent device performance with an EQEmax of 15.61%, a CEmax of 52.51 cd A–1, and outstanding CIE(x, y) color coordinates of (0.29, 0.61). This is one of the highest reported EQEs and CEs with high color purity for green solution-processed QLEDs and OLEDs using a divinyl-functionalized cross-linked HTM as the HTL. We believe that this study provides a new strategy for designing and synthesizing practical cross-linakable HTMs with enhanced performance for highly efficient solution-processed QLEDs and OLEDs.
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Details
- Title
- Low-Temperature Cross-Linkable Hole Transport Materials for Solution-Processed Quantum Dot and Organic Light-Emitting Diodes with High Efficiency and Color Purity
- Creators
- Athithan Maheshwaran - Daegu Gyeongbuk Institute of Science and TechnologyHyejeong Bae - Daegu Gyeongbuk Institute of Science and TechnologyJaehyoung Park - Daegu Gyeongbuk Institute of Science and TechnologyHyeonwoo Jung - Daegu Gyeongbuk Institute of Science and TechnologyYoungjun Hwang - Daegu Gyeongbuk Institute of Science and TechnologyJongyoun Kim - Daegu Gyeongbuk Institute of Science and TechnologyChaehyun Park - Korea Institute of Materials ScienceByeongjae Kang - Daegu Gyeongbuk Institute of Science and TechnologyMyungkwan Song - Korea Institute of Materials ScienceYoungu Lee - Daegu Gyeongbuk Institute of Science and Technology
- Publication Details
- ACS applied materials & interfaces, v 15(38), pp 45167-45176
- Publisher
- American Chemical Society
- Number of pages
- 10
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- A.J. Drexel Nanomaterials Institute
- Web of Science ID
- WOS:001066344200001
- Scopus ID
- 2-s2.0-85172935326
- Other Identifier
- 991022092348504721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology