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- Title
Robust Spirobifluorene Core Based Hole Transporters with High Mobility for Long‐Life Green Phosphorescent Organic Light‐Emitting Devices.
- Authors
Nagamura, Natsuo; Sasabe, Hisahiro; Sato, Hiroki; Ito, Nozomi; Abe, Shoki; Sukegawa, Yoshihito; Yokoyama, Daisuke; Kaji, Hironori; Kido, Junji
- Abstract
Using a tailored high triplet energy hole transport layer (HTL) is a suitable way to improve the efficiency and extend the lifetime of organic light‐emitting devices (OLEDs), which can use all molecular excitons of singlets and triplets. In this study, dibenzofuran (DBF)‐end‐capped and spirobifluorene (SBF) core‐based HTLs referred as TDBFSBF1 and TDBFSBF2 were effectively developed. TDBFSBF1 exhibited a high glass transition temperature of 178 °C and triplet energy of 2.5 eV. Moreover, a high external quantum efficiency of 22.0 %, long operational lifetime at 50 % of the initial luminance of 89,000 h, and low driving voltage at 1000 cd m−2 of 2.95 V were achieved in green phosphorescent OLEDs using TDBFSBF1. Further, a high‐hole mobility μh value of 1.9×10−3 cm2 V−1 s−1 was recorded in TDBFSBF2. A multiscale simulation successfully reproduced the experimental μh values and indicated that the reorganization energy was the primary factor in determining the mobility differences among these SBF core based HTLs.
- Subjects
PHOSPHORESCENCE; GLASS transition temperature; QUANTUM efficiency; REORGANIZATION energy; ORGANIC light emitting diodes; EXCITON theory
- Publication
Chemistry - A European Journal, 2023, Vol 29, Issue 1, p1
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202202636