Carbazole/sulfone hybrid D-π-A-structured bipolar fluorophores for high-efficiency blue-violet electroluminescence
Chemistry of Materials, ISSN: 0897-4756, Vol: 25, Issue: 13, Page: 2630-2637
2013
- 190Citations
- 45Captures
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Article Description
Based on a D-π-A structural strategy incorporating carbazole as a mild electron-donor and sulfone as an electron-acceptor with a π-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. CIE below 0.06 and excellent current/power efficiencies up to 1.89 cd A/1.58 lm W were achieved with their corresponding nondoped devices. These performances currently represent the best results for OLEDs with CIE < 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. © 2013 American Chemical Society.
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