Effect of the Number and Substitution Pattern of Carbazole Donors on the Singlet and Triplet State Energies in a Series of Carbazole-Oxadiazole Derivatives Exhibiting Thermally Activated Delayed Fluorescence

Cooper, Matthew W.; Zhang, Xiaoqing; Zhang, Yadong; Jeon, Soon Ok; Lee, Hasup; Kim, Sunghan; Fuentes-Hernandez, Canek; Barlow, Stephen; Kippelen, Bernard; Marder, Seth R.

doi:10.1021/acs.chemmater.8b02632

Title: Effect of the Number and Substitution Pattern of Carbazole Donors on the Singlet and Triplet State Energies in a Series of Carbazole-Oxadiazole Derivatives Exhibiting Thermally Activated Delayed Fluorescence

Journal Article · Mon Sep 10 00:00:00 EDT 2018 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.8b02632· OSTI ID:1767449

Cooper, Matthew W. ^[1];

^[1]; Zhang, Yadong ^[1]; Jeon, Soon Ok ^[2]; Lee, Hasup ^[2]; Kim, Sunghan ^[2];

^[1];

^[1]

Georgia Inst. of Technology, Atlanta, GA (United States)
Samsung Electronics Co., Ltd., Gyeonggi-do (Korea)

Substitution of a varying number of 9H-carbazole donors onto 2-(pentafluorophenyl)-5-phenyl-1,3,4-oxadiazole yields a series of donor–acceptor compounds with similar electrochemical band gaps, but dissimilar optical properties. Each substitution of a carbazole onto the 2- and 4-positions results in a 150–200 meV stabilization of the first singlet excited state, evident in the fluorescent emission. Here, the first triplet excited state is less sensitive to these substitutions, leading to a reduced energy separation between the singlet and triplet states, ΔE_ST, with increasing carbazole content. OLED devices made using the donor–acceptor compounds exhibiting the lowest ΔE_ST were fabricated and exhibit sky blue emission with an external quantum efficiency of up to 24.4% at a luminance of 10 cd m^–2, and 9.2% at 1000 cd m^–2.

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Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0008205

OSTI ID:: 1767449

Journal Information:: Chemistry of Materials, Vol. 30, Issue 18; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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Title: Effect of the Number and Substitution Pattern of Carbazole Donors on the Singlet and Triplet State Energies in a Series of Carbazole-Oxadiazole Derivatives Exhibiting Thermally Activated Delayed Fluorescence

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