1567346-72-8Relevant academic research and scientific papers
Construction of high Tg bipolar host materials with balanced electron-hole mobility based on 1,2,4-thiadiazole for phosphorescent organic light-emitting diodes
Jin, Jiangjiang,Zhang, Wenzhi,Wang, Bo,Mu, Guanyuan,Xu, Peng,Wang, Lei,Huang, Hong,Chen, Jiangshan,Ma, Dongge
, p. 2388 - 2395 (2014)
A novel electron-transporting moiety, 1,2,4-thiadiazole, was first introduced to construct bipolar host molecules for phosphorescent organic light-emitting diodes (PhOLEDs). By incorporating 1,2,4-thiadiazole with typical hole-transporting carbazole moieties, a series of thiadiazole/carbazole hybrids, o-CzTHZ, m-CzTHZ, and p-CzTHZ, were synthesized. All the hybrids exhibit very high glass transition temperatures (Tg ≥ 167 °C) and show good thermal and morphological stability in films. Moreover, these host materials possess good bipolar charge transporting properties; electron and hole mobilities of these bipolar thiadiazole/carbazole hybrids can be tuned by simply adjusting the linkage modes between thiadiazole and carbazole moieties. The maximum external quantum efficiencies (ηEQE, max) in the green PhOLEDs with o-CzTHZ, m-CzTHZ, and p-CzTHZ as the hosts reached 26.1%, 24.0%, and 22.9%, respectively, and their EQE were still over 20% even at the high luminance of 10,000 cd/m2. This study demonstrates that 1,2,4-thiadiazole should be an excellent electron-transporting unit for bipolar phosphorescent hosts.
1, 2, 4-thiadiazole derivatives and their use as electroluminescent materials
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Paragraph 0050; 0053, (2017/02/28)
The invention relates to design and synthesis of organic electroluminescence materials which take 1,2,4-thiadiazole electronics transmission groups as a central unit as well as an application of the 1,2,4-thiadiazole electronics transmission groups on an organic electroluminescent device (OLED). The electroluminescent materials take 1,2,4-thiadiazole as a core, groups with different electronic or cavity transmission groups are bonded at positions 3 and 5 sites of 1,2,4-thiadiazole, carrier balance can be effectively solved, exciton recombination with high efficiency is radically realized, thus further combination of high efficiency light-emitting and energy level adjustment of the material can be realized. In addition, the energy level of the compound can be adjusted through an unsymmetrical structure, compared with the electronics transmission groups (such as oxadiazoles, 1,3,5-triazole) in the common main materials, the OLED devices has substantial effects in brightness, efficiency, glass transition temperature and the like, so that the material provided in the invention can be widely applied in the field of organic electroluminescence.
