Improved electroluminescence with reversed bilayers of thiophene/phenylene co-oligomer derivatives

• Shohei Dokiya

• Fumio Sasaki

• Shu Hotta

• Hisao Yanagi

Abstract

Organic electroluminescence (EL) devices were fabricated with bilayered thiophene/phenylene co-oligomer (TPCO) derivatives: p-type 5,5′-bis(4-biphenylyl)-2,2′-bithiophene (BP2T) and n-type 5,5′-bis(4′-cyanobiphenyl-4-yl)-2,2′-bithiophene (BP2T-CN). Two types of EL device, Al:Li/BP2T-CN/BP2T/ITO (device A) and Au/BP2T/BP2T-CN/ITO (device B), were investigated using vapor-deposited films of BP2T and BP2T-CN by changing the order of deposition onto the indium–tin-oxide (ITO)/glass substrate. The EL performance was significantly improved for device B in which the two molecules had a lying orientation suitable for efficient carrier injection and transport as well as surface emission. In device A, on the other hand, the standing BP2T orientation resulted in much lower current density and EL intensity.

Journal

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 55 (3S2), 03DC13-, 2016-02-19

  IOP Publishing

Keywords

• General Physics and Astronomy
• General Engineering

Details

• CRID: 1360565171312838144
• NII Article ID: 210000146188
• DOI: 10.7567/jjap.55.03dc13
• ISSN: 13474065
• ISSN: 00214922
• ISSN: http://id.crossref.org/issn/13474065
• Web Site: http://stacks.iop.org/1347-4065/55/i=3S2/a=03DC13/pdf
• Web Site: http://stacks.iop.org/1347-4065/55/i=3S2/a=03DC13?key=crossref.faa039f1cfe41ec024d82ce483e73278
• Web Site: https://iopscience.iop.org/article/10.7567/JJAP.55.03DC13
• Web Site: https://iopscience.iop.org/article/10.7567/JJAP.55.03DC13/pdf
• Data Source:
  • Crossref
  • CiNii Articles
  • KAKEN