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Issue 17, 2016
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Benzobisoxazole cruciforms: a tunable, cross-conjugated platform for the generation of deep blue OLED materials

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Abstract

Four new cross-conjugated small molecules based on a central benzo[1,2-d:4,5-d′]bisoxazole moiety possessing semi-independently tunable HOMO and LUMO levels were synthesized and the properties of these materials were evaluated experimentally and theoretically. The molecules were thermally stable with 5% weight loss occurring well above 350 °C. The cruciforms all exhibited blue emission in solution ranging from 433–450 nm. Host–guest OLEDs fabricated from various concentrations of these materials using the small molecule host 4,4′-bis(9-carbazolyl)-biphenyl (CBP) exhibited deep blue-emission with Commission Internationale de L'Eclairage (CIE) coordinates of (0.15 ≤ x ≤ 0.17, 0.05 ≤ y ≤ 0.11), and maximum luminance efficiencies as high as ∼2 cd A−1. These results demonstrate the potential of benzobisoxazole cruciforms as emitters for developing high-performance deep blue OLEDs.

Graphical abstract: Benzobisoxazole cruciforms: a tunable, cross-conjugated platform for the generation of deep blue OLED materials

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Publication details

The article was received on 03 Nov 2015, accepted on 19 Jan 2016 and first published on 20 Jan 2016


Article type: Paper
DOI: 10.1039/C5TC03622D
Citation: J. Mater. Chem. C, 2016,4, 3765-3773
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    Benzobisoxazole cruciforms: a tunable, cross-conjugated platform for the generation of deep blue OLED materials

    R. Chavez III, M. Cai, B. Tlach, D. L. Wheeler, R. Kaudal, A. Tsyrenova, A. L. Tomlinson, R. Shinar, J. Shinar and M. Jeffries-EL, J. Mater. Chem. C, 2016, 4, 3765
    DOI: 10.1039/C5TC03622D

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