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Novel hole blocking materials based on 2,6-disubstituted dibenzo[: B, d] furan and dibenzo [b, d] thiophene segments for high-performance blue phosphorescent organic light-emitting diodes

Title
Novel hole blocking materials based on 2,6-disubstituted dibenzo[: B, d] furan and dibenzo [b, d] thiophene segments for high-performance blue phosphorescent organic light-emitting diodes
Authors
Jang, SeokhoonLee, Kyung HyungLee, Jun YeobLee, Youngu
DGIST Authors
Lee, Youngu
Issue Date
2019-01
Citation
Journal of Materials Chemistry C, 7(4), 826-834
Type
Article
Article Type
Article
Keyword
Benzene; Electron transport properties; Organic pollutants; Phosphorescence; Physicochemical properties; Structural optimization; Thiophene; Blue phosphorescent organic light-emitting diodes; Computational simulation; Electrochemical analysis; External quantum efficiency; High thermal stability; High triplet energies; Hole-blocking materials; Low turn-on voltages; Organic light emitting diodes (OLED)
ISSN
2050-7534
Abstract
Novel hole blocking materials (HBMs) based on 2,6-disubstituted dibenzo[b,d]furan and dibenzo[b,d]thiophene segments, 3,3′,3′′,3′′′-(dibenzo[b,d]furan-2,6-diylbis(benzene-5,3,1-triyl))tetrapyridine (26DBFPTPy) and 3,3′,3′′,3′′′-(dibenzo[b,d]thiophene-2,6-diylbis(benzene-5,3,1-triyl))tetrapyridine (26DBTPTPy), are successfully designed and synthesized for high-performance blue phosphorescent organic light-emitting diodes (PhOLEDs) for the first time. Computational simulation is used to investigate the optimal structure, orbital distribution, and physicochemical properties of both molecules. Thermal, optical, and electrochemical analysis shows that 26DBFPTPy and 26DBTPTPy possess high thermal stability, deep HOMO energy levels (-7.08 and -6.91 eV), and a high triplet energy (ET) (2.75 and 2.70 eV). Blue PhOLEDs with 26DBFPTPy or 26DBTPTPy as a hole blocking layer (HBL) exhibit a low turn-on voltage (3.0 V) and operating voltage (4.5 V) at 1000 cd m-2. In addition, the blue PhOLEDs with 26DBFPTPy or 26DBTPTPy show superior external quantum efficiencies (24.1 and 23.6%) and power efficiencies (43.9 and 42.7 lm W-1). They also show a very small efficiency roll-off of about 8.5% from 100 to 1000 cd m-2. Furthermore, they exhibit improved lifetimes compared to the similarly designed HBL with a pyridine electron transport unit and a phenyl core structure. © 2019 The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/9608
DOI
10.1039/c8tc04900a
Publisher
Royal Society of Chemistry
Related Researcher
  • Author Lee, Youngu Organic & Printed Electronics Laboratory(OPEL)
  • Research Interests OTF Solar cell; OLED; Printed Electronics; 유기박막형 태양전지; OLED; Printed Electronics
Files:
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Collection:
Department of Energy Science and EngineeringOrganic & Printed Electronics Laboratory(OPEL)1. Journal Articles


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