Synthesis and properties of a thiophene-substituted diaza[7]helicene for application as a blue emitter in organic light-emitting diodes |
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| Authors: | Ting Chen Baojie Zhang Zhi Liu Lian Duan Guifang Dong Ying Feng Xinyu Luo Deliang Cui |
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| Affiliation: | 1. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;2. Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China |
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| Abstract: | Carbazole-based diaza[7]helicene substituted by thiophene groups, 2,12-dithiophene-5,15-dihexyl-5,15-diaza[7]helicene (6), was synthesised successfully and confirmed by 1H NMR, 13C NMR, High Resolution Mass Spectrometry, Time of Flight Mass Spectrometry. Compound 6 exhibited good solubility and excellent thermal stability with no melting point and a high decomposition temperature of 453.64 °C. A doped device with a structure of ITO/NPB (50 nm)/CBP: 10% 6 (30 nm)/Bphen (20 nm)/Mg:Ag (150 nm)/Ag (50 nm) emitted the blue light at 460 nm with Commission Internationale de LEclairage (CIE) coordinate of (0.176, 0.26). The maximum brightness and external quantum efficiency (EQE) were 2306 cd m?2 and 0.41%, respectively. |
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| Keywords: | Thiophene-substituted diaza[7]helicene Fluorescence Blue-emitting material OLED |
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