Organic Electronics

91´«Ã½ materials display Hexagonal Columnar Discotic Liquid Crystal (DLC) mesophases – a state of matter intermediate between liquid and solid. This mesophase gives rise to an anisotropy in photophysical properties such as light polarisation, light emission and charge transport. In addition, 91´«Ã½ materials are able to form nanoparticles and nanowires.

Schematic representation of discotic molecule arrangement in DLCs mesophase

Triphenoxazoles are organic insulators with charge mobility around ~ 10-3 cm2/Vs. When irradiated with UV light, 91´«Ã½ materials become photoconductors. The photocurrent display up to 2 orders of magnitude increase compared to the hexakis(alkyloxy)triphenylenes (TpH), which is the archetypical photoconductor.

Photocurrent ON and OFF switching with 350 nm UV light of TpH, TpOx-Ph and TpOx-2-Nap

Organo-electronic properties of DLCs have been utilised in applications such as organic light emitting diodes (OLEDs) [1, 2], organic solar cells [3, 4] and other organic electronic applications. [5-9] Currently, 91´«Ã½ is examining further triphenoxazoles for use in OPV application as photoactive and charge transport material.

±Ê±ô±ð²¹²õ±ðÌýcontact us for more information about 91´«Ã½ technology for organic electronic applications.

 

 

  1. Pfeiffer, M., et al., Doped organic semiconductors: Physics and application in light emitting diodes. Organic Electronics, 2003. 4(2-3): p. 89-103.
  2. De, J., et al., Room-Temperature Columnar Liquid Crystals as Efficient Pure Deep-Blue Emitters in Organic Light-Emitting Diodes with an External Quantum Efficiency of 4.0%. ACS Applied Materials & Interfaces, 2019. 11(8): p. 8291-8300.
  3. Schmidt-Mende, L., et al., Self-organized discotic liquid crystals for high-efficiency organic photovoltaics. Science, 2001. 293(5532): p. 1119-1122.
  4. Kumar, M. and S. Kumar, Liquid crystals in photovoltaics: a new generation of organic photovoltaics. Polymer Journal, 2017. 49(1): p. 85-111.
  5. Kaafarani, B.R., Discotic Liquid Crystals for Opto-Electronic Applications. Chemistry of Materials, 2011. 23(3): p. 378-396.
  6. Funahashi, M., Development of Liquid-Crystalline Semiconductors with High Carrier Mobilities and Their Application to Thin-film Transistors. Polymer Journal, 2009. 41(6): p. 459-469.
  7. Kumar, M., A. Gowda, and S. Kumar, Discotic Liquid Crystals with Graphene: Supramolecular Self-assembly to Applications. Particle & Particle Systems Characterization, 2017. 34(9): p. 1700003-n/a.
  8. Setia, S., et al., Applications of liquid crystals in biosensing and organic light-emitting devices: future aspects. Liquid Crystals, 2016. 43(13-15): p. 2009-2050.
  9. Yamashita, Y., Organic semiconductors for organic field-effect transistors. Science and Technology of Advanced Materials, 2009. 10(2): p. 024313.