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Photophysical characteristics of 4,4′-bis(N-carbazolyl)tolan derivatives and their application in organic light emitting diodes |
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| Authors: | Masakazu Ohkita Kimihiro Sumiya Takanori Suzuki |
| Institution: | a Graduate School of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan b Center for Future Chemistry, and Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, Fukuoka 819-0395, Japan c Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan |
| Abstract: | 4,4′-bis(N-carbazolyl)tolan (BCT) and 4,4′-bisN-(3,6-di-t-butyl)carbazolyl]tolan (BCT-t-Bu) were synthesized as π-expanded analogs of 4,4′-bis(N-carbazolyl)biphenyl. Their photophysical characteristics both in solution and films were thoroughly investigated. Interestingly, the phosphorescence spectrum of BCT was significantly medium-dependent, and the emission maximum was red-shifted by 131 nm from 489 nm in solution at 77 K to 620 nm in a deposited film at 5 K, suggesting the presence of strong intermolecular interactions in the film. BCT and BCT-t-Bu were found to be useful as host materials for fluorescence-based organic light emitting diodes (OLEDs). However, their low triplet energy levels in films negated their potential to act as hosts in phosphorescence-based OLEDs. |
| Keywords: | Carbazole Acetylene Photophysical properties Organic light emitting diodes Host materials |
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