Highly efficient deep-blue organic light emitting diode with a carbazole based fluorescent emitter. (21st February 2018)

• Record Type: Journal Article
• Authors: Sahoo, Snehasis; Dubey, Deepak Kumar; Singh, Meenu; Joseph, Vellaichamy; Thomas, K. R. Justin; Jou, Jwo-Huei
• Is Part Of: Japanese journal of applied physics. Volume 56:Number 4(2017)Supplement
• Publication Date: 2018-02-21
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.57.04FL08
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: High efficiency deep-blue emission is essential to realize energy-saving, high-quality display and lighting applications. We demonstrate here a deep-blue organic light emitting diode using a novel carbazole based fluorescent emitter 7-[4-(diphenylamino)phenyl]-9-(2-ethylhexyl)-9 H -carbazole-2-carbonitrile (JV234). The solution processed resultant device shows a maximum luminance above 1, 750 cd m −2 and CIE coordinates with a 1.3 lm W −1 power efficiency, 2.0 cd A −1 current efficiency, and 4.1% external quantum efficiency at 100 cd m −2 . The resulting deep-blue emission enables a greater than 100% color saturation. The high efficiency may be attributed to the effective host-to-guest energy transfer, suitable device architecture facilitating balanced carrier injection and low doping concentration preventing efficiency roll-off caused by concentration quenching.