Construction of High Tg Bipolar Host Materials with Balanced Electron–Hole Mobility Based on 1,2,4-Thiadiazole for Phosphorescent Organic Light-Emitting Diodes

Autor:	Guanyuan Mu, Dongge Ma, Hong Huang, Peng Xu, Jiangjiang Jin, Lei Wang, Bo Wang, Wenzhi Zhang, Jiangshan Chen
Rok vydání:	2014
Předmět:	Materials science business.industry Carbazole General Chemical Engineering General Chemistry Electron hole Photochemistry chemistry.chemical_compound chemistry Materials Chemistry OLED Optoelectronics Molecule Moiety Phosphorescence business Glass transition Diode
Zdroj:	Chemistry of Materials. 26:2388-2395
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm403388s
Popis:	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 tha...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b9426d987b764644a8dbdd1a2972730e https://doi.org/10.1021/cm403388s Zobrazit plný text záznamu