Chinese Journal of Organic Chemistry >
Synthesis and Electroluminescence of Thiazolo[5,4-b]carbazole Based Blue Fluorescent Materials
Received date: 2019-02-28
Revised date: 2019-04-23
Online published: 2019-05-15
Supported by
Project supported by the Key Research Funds of Anhui Province (Nos. KJ2018A0525, 1508085QB41), the Student's Platform for Innovation and Entrepreneurship Training Program of Anhui Science and Technology University (No. 201810879X017), the Open Project for Engineering Research Center of Nano-Geo Materials of Ministry of Education (No. NGM2018KF006), and the Key Discipline of Anhui Science and Technology University (No. AKZDXK2015A01).
Two thiazolo[5,4-b]carbazole based blue fluorescent materials, namely TCz-PCz and TCz-TPA, were synthesized by palladium catalyzed C-C and C-N coupling reactions, and their structures were confirmed by 1H NMR, 13C NMR, mass spectrometry and elemental analysis. The thermal, photophysical, and electrochemical properties of these materials were fully investigated. The results indicate that these compounds possess thermal and amorphous stabilities with decomposition temperature up to 400℃ and glass transition temperatures of 119℃. Both TCz-PCz and TCz-TPA show strong blue emission in solution with high fluorescent quantum yields of 71% and 73%, respectively. These molecules show high HOMO energy levels of -5.41 and -5.21 eV that are favorable for hole injection and transportation from hole-transporting layer to the emitting layer in devices. The non-doped blue OLED using TCz-PCz as emitter through vacuum evaporation was fabricated for purpose of investigating its electroluminescence properties. The device exhibited stable blue electroluminescence, a low turn-on voltage of 3.1 V, a maximum luminance of 2190 cd·m-2, and a maximum current efficiency of 2.88 cd·A-1 were achieved, respectively.
Zhang Ting , Qiu Ziye , Cheng Xiaojie , Zhang Yulu , Wang Xuchun . Synthesis and Electroluminescence of Thiazolo[5,4-b]carbazole Based Blue Fluorescent Materials[J]. Chinese Journal of Organic Chemistry, 2019 , 39(9) : 2534 -2540 . DOI: 10.6023/cjoc201902035
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