Journal
CHEMISTRY OF MATERIALS
Volume 25, Issue 13, Pages 2630-2637Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm400945h
Keywords
blue-violet electroluminescence; carbazole; sulfone; bipolar fluorophor
Funding
- National Natural Science Foundation of China [50825304, 51033007, 51103169, 51128301]
- Beijing Natural Science Foundation, P. R. China [2111002]
- Research Grants Council of the Hong Kong [T23-713/11]
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Based on a D-pi-A structural strategy incorporating carbazole as a mild electron-donor and sulfone as an electron-acceptor with a pi-conjugation-breaking feature, two novel blue-violet emitting materials (CzS1 and CzS2) were successfully designed and synthesized. The two compounds exhibit high-efficiency fluorescent emissions of intramolecular charge-transfer transition type, with impressively high quantum yields in both solution and film states. CIEy below 0.06 and excellent current/power efficiencies up to 1.89 cd A(-1)/1.58 lm W-1 were achieved with their corresponding nondoped devices. These performances currently represent the best results for OLEDs with CIEy < 0.06. Moreover, single-carrier devices were also fabricated to demonstrate the bipolar characteristics as well as to understand the different electroluminescence performance of the two fluorophores.
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