Influence of thickness of functional layer on performance of organic salt-doped OLED with ITO/PVK: PBD:TBAPF6/Al structure

Chi Chin Yap, Muhammad Yahaya, Muhamad Mat Salleh

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

The effect of thickness of functional layer on the electrical and electroluminescence (EL) properties of single-layer OLED with ITO/PVK:PBD:TBAPF6/Al structure were investigated where indium tin oxide (ITO) was used as anode, poly(9-vinylcarbazole) (PVK) as polymeric host, 2-(4-biphenylyl)-5-phenyl-1,3,4-oxadiazole (PBD) as electron-transporting molecule, tetrabutylammonium hexafluorophosphate (TBAPF6) as organic salt dopant and aluminium (Al) as cathode. A unique transition phenomenon at high bias voltage in the devices was observed and the transition was reversible. The transition voltage and turn on voltage decreased with the decrease of functional layer thickness. The turn on voltage was approximately 5.5 V and 6.5 V for 55-nm-thick and 95-nm-thick devices, respectively. However, the current efficiency of 95-nm-thick device was higher than the 55-nm-thick device. More interestingly, the Commission Internationale d'Eclairage (C.I.E.) coordinates of EL spectra of 95-nm-thick device at bias voltage ranging from 7 V to 13 V located in the white light region even without any dye doping. The PL and EL spectra were found completely different. PBD electromer was proposed to dominate the EL spectrum, but the contribution from PVK-PBD electroplex cannot be completely ruled out.

Original languageEnglish
Pages (from-to)637-644
Number of pages8
JournalCurrent Applied Physics
Volume8
Issue number5
DOIs
Publication statusPublished - Aug 2008

Fingerprint

Electroluminescence
Organic light emitting diodes (OLED)
Tin oxides
Aluminum
indium oxides
Indium
tin oxides
Salts
electroluminescence
salts
aluminum
electric potential
Bias voltage
Electric potential
Doping (additives)
Anodes
Cathodes
Coloring Agents
Dyes
anodes

Keywords

  • Doping
  • Functional layer thickness
  • Organic light emitting diodes
  • Organic salt
  • Tetrabutylammonium hexafluorophosphate

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science (miscellaneous)

Cite this

Influence of thickness of functional layer on performance of organic salt-doped OLED with ITO/PVK : PBD:TBAPF6/Al structure. / Yap, Chi Chin; Yahaya, Muhammad; Mat Salleh, Muhamad.

In: Current Applied Physics, Vol. 8, No. 5, 08.2008, p. 637-644.

Research output: Contribution to journalArticle

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