Add time:07/19/2019         Source:sciencedirect.com

4,4′-bis(N-carbazolyl)tolan (BCT) and 4,4′-bis[N-(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.

► We synthesized N-carbazolyl-tolan derivatives (BCT) as π-expanded analogues of CBP. ► We found that BCT derivatives are useful as host materials for fluorescence-based OLEDs. ► BCT's low triplet energy levels negated their potential to act as hosts in phosphorescence-OLEDs.

We also recommend Trading Suppliers and Manufacturers of N,N'-bis(2-methylphenyl)benzene-1,4-diamine (cas 15017-02-4). Pls Click Website Link as below: cas 15017-02-4 suppliers