Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 18, Issue 24, Pages 3922-3930Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.200800697
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Funding
- Korea government (MEST) [M10600000157-06J0000-15710]
- University IT Research Center (ITRC)
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Highly efficient deep-blue fluorescent materials based on phenylquinoline-carbazole derivatives (PhQ-CVz, MeO-PhQ-CVz, and CN-PhQ-CVz) are synthesized for organic light-emitting diodes (OLEDs). The materials form high-quality amorphous thin films by thermal evaporation and the energy levels can be easily adjusted by the introduction of different electron-donating and electron-withdrawing groups on carbazoylphenylquinoline. Non-doped deep-blue OLEDs that use PhQ-CVz as the emitter show bright emission (Commission Internationale de L'Eclairage (CIE) coordinates, x = 0.156, y = 0.093) with an external quantum efficiency of 2.45%. Furthermore, the material works as an excellent host material for 4,4'-bis(9-ethyl-3-carbazovinylene)- 1,1'-biphenyl dopant to get high-performance OLEDs with excellent deep-blue CIE coordinates (x = 0.155, y = 0.157), high power efficiency (5.98 lm W-1), and high external quantum efficiency (5.22%).
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