Bicarbazole-cyanopyridine based bipolar host materials for green and blue phosphorescent OLEDs: influence of the linking style between P- and N-type units

Abstract

Three novel compounds, namely CNPyPhBCz, o-CNPyBCz, and m-CNPyBCz, were developed for use as bipolar host materials for organic light-emitting devices (OLEDs). 9H-3,9'-Bicarbazole (BCz) were selected as the hole transporting group...

Carbazole and dibenzo[b,d]furan-based hole transport materials with high thermal stability

“…Organic light emitting diodes (OLEDs) have received extensive attention and experienced rapid development, and will dominate the display field in the few next decade is [1][2][3][4] due to their high electroluminescent (EL) efficiency, full color, fast response, wide view angle, and good plasticity. [5][6][7][8][9][10][11] To date, the organic layer structure of the device has been continuously optimized from single to multi-layer, 12,13 where among them, hole transport materials 14 (HTMs) require the greatest materials consumption. HTMs are closely related to the EL performance of the device as they reduce the energy barriers for hole injection, thus confining the recombination region of excitons.…”