Electron injection effects in electroluminescent devices using polymer blend thin films

C. C. Wu, J. C. Sturm, R. A. Register, L. Suponeva, M. E. Thompson

Research output: Contribution to journalConference article

Abstract

In this paper, we discuss the effects of electron injection on eleotroluminescence (EL) efficiency in single-layer EL devices using blends of poly(N-vinylcarbazole) (PVK) and poly(3-n-butyl-p-pyridyl vinylene) (Bu-PPyV). Pure Bu-PPyV thin films suffer from formation of excimers due to the strong interchain interaction. Diluting Bu-PPyV with the high-energy-gap and hole-transporting polymer PVK suppresses excimer formation and substantially raises both photoluminescence (PL) and EL efficiencies. The emission color is converted from red to green, indicating a transition from excimer emission to monomer emission of Bu-PPyV. The electron injection and EL efficiency can be further improved by adding small-molecule oxadiazoles into the blends as electron-transport materials. In optimized devices, an external EL quantum efficiency (backside emission only) as high as 0.8% photon/electron and practical brightnesses of 100 cd/m2 and 1000 cd/m2 can be achieved at approximately 9 V and approximately 13.5 V, respectively.

Original languageEnglish (US)
Pages (from-to)489-494
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume424
DOIs
StatePublished - Jan 1 1996
EventProceedings of the 1996 MRS Spring Meeting - San Francisco, CA, USA
Duration: Apr 8 1996Apr 11 1996

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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