9-(2-ethylhexyl)carbazole for carrier transport and photorefractive materials

Tetsuya Aoyama; Jean-Charles Ribierre; Takafumi Sassa; Takashi Kobayashi; Tsuyoshi Muto; Tatsuo Wada

doi:10.1117/12.559242

26 October 2004 9-(2-ethylhexyl)carbazole for carrier transport and photorefractive materials

Tetsuya Aoyama, Jean-Charles Ribierre, Takafumi Sassa, Takashi Kobayashi, Tsuyoshi Muto, Tatsuo Wada

Proceedings Volume 5521, Organic Holographic Materials and Applications II; (2004) https://doi.org/10.1117/12.559242
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

We investigated the carrier transport and photorefractive properties in multi-component materials containing 9-(2-ethylhexyl)carbazole (EHCz), so-called liquid carbazole. The electric-field dependence of the carrier mobility for EHCz and polyvinylcarbazole (PVK) was measured by the time-of-flight (TOF) technique. We obtained the higher carrier mobility of 4.2 x 10^-6 cm²/Vs with an electric field of 2.5 x 10⁵ V/cm for EHCz than that of 6.4 x 10^-7 cm²/Vs for PVK. We also performed the two-beam coupling (TBC) technique to investigate photorefractive responses for the guest-host polymers containing PVK, EHCz, the electro-optic chromophore 4-piperidinobenzylidene malonitrile (PDCST), and the sensitizer C₆₀. The measurement showed that the TBC gain depended on the mixture ratio of PVK and EHCz. The TBC gain was enhanced from 31 to 85 cm^-1 at an electric field of 60 V/μm by increasing the concentration of EHCz from 10 to 15 wt%. These results show that EHCz plays important role for the optoelectronic and photorefractive materials as a hole transport materials as well as a plasticizer.

Citation Download Citation

Tetsuya Aoyama, Jean-Charles Ribierre, Takafumi Sassa, Takashi Kobayashi, Tsuyoshi Muto, and Tatsuo Wada "9-(2-ethylhexyl)carbazole for carrier transport and photorefractive materials", Proc. SPIE 5521, Organic Holographic Materials and Applications II, (26 October 2004); https://doi.org/10.1117/12.559242

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