Asymmetric anthracene host decorated with benzothienocarbazole for high efficiency blue organic light-emitting diodes. (November 2022)

• Record Type: Journal Article
• Authors: Patil, Vilas Venunath; Lim, Junseop; Lee, Jun Yeob
• Is Part Of: Dyes and pigments. Volume 207(2022)
• Publication Date: 2022-11
• Subjects: Triplet–triplet annihilation -- Anthracene -- Pure-blue -- High efficiency; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2022.110688
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: In this work, we describe an asymmetric anthracene-based 5-(4-(10-phenylanthracen-9-yl)phenyl)-5 H -benzo [4, 5]thieno[3, 2- c ]carbazole (ATDBT) for high efficiency doped and non-doped organic light-emitting diodes (OLEDs). Anthracene triggered triplet-triplet annihilation and structurally induced bipolar characteristics of the ATDBT significantly accelerated the triplet to singlet up-conversion process. The fabricated devices eventually achieved high efficiency with a small efficiency roll-off at high luminance. The doped device with ATDBT as the host has a maximum external quantum efficiency (EQE) of more than 8%, pure-blue emission, and maximum luminance of more than 40, 000 cd/m 2 . The non-doped ATDBT device also showed a high EQE of 4.9%. As a result, ATDBT-type asymmetric molecular structures are vital for the development of high-efficiency doped and non-doped blue OLEDs. Highlights: Asymmetric anthracene based emitting materials for non-doped organic light-emitting diode. High efficiency by triplet-triplet annihilation mechanism through anthracene core. High efficiency and small efficiency roll-off through benzothienocarbazole group.