New Multi-Phenylated Carbazole Derivatives for OLED through Diels-Alder Reaction

Abstract

We synthesized multi-phenylated carbazole derivatives such as 3,6-Bis[(2,3,4,5-tetraphenyl)phenyl]-9-ethylcarbazole(BTPEC) and 3,6-Bis(7,10-diphenyl-fluoranthene)-9-ethlycarbazole(BDPEC), through Diels-Alder reaction. These products were identified by NMR, Fab-Mass analysis.

Electro-optical properties of these materials were characterized by cyclic voltammetry (CV) and, UV-visible and photoluminescence (PL) spectra. The maximum absorbance of BTPEC appeared at 307 nm and BDPEC showed maximum absorbance of 307 nm and 388 nm. And two compounds also exhibited PL peaks at 389 nm and 483 nm. When we used these two materials as hole injection layer(HIL) and hole transport layer(HTL) in OLED device, the devices showed about 3 cd/A and 2 cd/A, respectively.

Keywords:

• Diels-Alder reaction
• electroluminescent
• hole injection
• hole transport
• organic light-emitting diode

Acknowledgments

This work was supported by grant No. R01-2006-00010196 from the Basic Research Program of the Korea Science & Engineering Foundation.

This study was supported by the department specialization Fund, 2007 of The Catholic University of Korea.