Enhanced Horizontal Dipole Orientation by Novel Penta-Helicene Anthracene-Based Host for Efficient Blue Fluorescent OLEDs.

Autor: Kuang C; School of Advanced Materials, Peking University Shenzhen Graduate School, Peking University, Shenzhen, 518055, China., Li S; Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China., Murtaza I; Department of Physics, International Islamic University, Islamabad, 44000, Pakistan., Meng Z; School of Advanced Materials, Peking University Shenzhen Graduate School, Peking University, Shenzhen, 518055, China., Li H; School of Advanced Materials, Peking University Shenzhen Graduate School, Peking University, Shenzhen, 518055, China., Zhang X; School of Advanced Materials, Peking University Shenzhen Graduate School, Peking University, Shenzhen, 518055, China., Wu C; Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China., Tong KN; Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China., Shang Y; School of Advanced Materials, Peking University Shenzhen Graduate School, Peking University, Shenzhen, 518055, China., He Y; School of Advanced Materials, Peking University Shenzhen Graduate School, Peking University, Shenzhen, 518055, China., Zhu Y; Faculty of Materials Science, Shenzhen MSU-BIT University, Shenzhen, 518172, China., Wei G; Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China., Meng H; School of Advanced Materials, Peking University Shenzhen Graduate School, Peking University, Shenzhen, 518055, China.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Jun; Vol. 20 (24), pp. e2311114. Date of Electronic Publication: 2023 Dec 29.
DOI: 10.1002/smll.202311114
Abstrakt: Due to the relatively low photoluminescence quantum yield (PLQY) and horizontal dipole orientation of doped films, anthracene-based fluorescent organic light-emitting diodes (F-OLEDs) have faced a great challenge to achieve high external quantum efficiency (EQE). Herein, a novel approach is introduced by incorporating penta-helicene into anthracene, presented as linear-shaped 3-(4-(10-phenylanthracen-9-yl)phenyl)dibenzo[c,g]phenanthrene (BABH) and 3-(4-(10-(naphthalen-2-yl)anthracen-9-yl)phenyl)dibenzo[c,g]phenanthrene (NABH). These blue hosts exhibit minimal intermolecular overlap of π-π stacking, effectively suppressing excimer formation, which facilitates the effective transfer of singlet energy to the fluorescent dopant for PLQY as high as 90%. Additionally, the as-obtained two hosts of BABH and NABH have effectively demonstrated major horizontal components transition dipole moments (TDM) and high thermal stability with glass transitional temperature (T g ) surpassing 188 °C, enhancing the horizontal dipole orientation of their doped films to be 89% and 93%, respectively. The OLEDs based on BABH and NABH exhibit excellent EQE of 10.5% and 12.4% at 462 nm and device lifetime up to 90% of the initial luminance over 4500 h at 100 cd m -2 , which has firmly established them as among the most efficient blue F-OLEDs based on anthracene to date to the best knowledge. This work provides an instructive strategy to design an effective host for highly efficient and stable F-OLEDs.
(© 2023 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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