Architectures for efficient electrophosphorescent organic light-emitting devices

Chihaya Adachi, Mark E. Thompson, Stephen R. Forrest

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

We discuss several device architectures leading to high-efficiency organic electrophosphorescent (EP) light emission. An external electroluminescence efficiency (ηext) of (10.0 ± 0.5)% was realized by doping fac-tris(2-phenylpyridine)iridium (Ir(ppy)3) into a 2,9-dimethyl-4,7-diphenyl-1,10-phenenthroline (BCP) electron transport layer. Direct exciton formation on the phosphor dopant avoids exciplex formation at the interface of unipolar hole and electron transport layers. Further, triplet exciton and carrier dynamics in a double heterostructure were investigated to determine the location and width of the exciton formation zone. High-efficiency EP is also demonstrated in a simplified two layer architecture using a 4,4′-N,N′-dicarbazole-biphenyl (CBP) ambipolar carrier transport host.

Original languageEnglish
Pages (from-to)372-377
Number of pages6
JournalIEEE Journal on Selected Topics in Quantum Electronics
Volume8
Issue number2
DOIs
Publication statusPublished - Mar 1 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Atomic and Molecular Physics, and Optics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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