Systematic investigation of nanoscale adsorbate effects at organic light-emitting diode interfaces. Interfacial structure - Charge injection - Luminance relationships

Qinglan Huang, Jianfeng Li, Guennadi A. Evrnenenko, Pulak Dutta, Tobin J Marks

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Molecule-scale structure effects at indium tin oxide (ITO) anode-hole transport layer (HTL) interfaces in organic light-emitting diode (OLED) heterostructures are systematically probed via a self-assembly approach. A series of ITO anode-linked silyltriarylamine precursors differing in aryl group and linker density are synthesized for this purpose and used to probe die relationship between nanoscale interfacial chemical structure and charge-injection/electroluminescence properties. These precursors form conformal and largely pinhole-free self-assembled monolayers (SAMs) on the ITO anode surface with angstrom-level thickness control. Deposition of a HTL on top of the SAMs places the probe molecules precisely at the anode-HTL interface. OLEDs containing ITO/SAM/HTL configurations have dramatically varied hole-injection magnitudes and OLED responses. These can be correlated with the probe molecular structures and electrochemically derived heterogeneous electron-transfer rates for such triarylamine fragments. The large observed interfacial molecular structure effects offer an approach to tuning OLED hole-injection flux over 1-2 orders of magnitude, resulting in up to 3-fold variations in OLED brightness at identical bias and up to a 2 V driving voltage reduction at identical brightness. Very bright and efficient (∼70000 cd/m 2, ∼2.5% forward external quantum efficiency, ∼11 lm/W power efficiency) Alq (tris(8-hydroxyquinolinato)aluminum(III))-based OLEDs can thereby be fabricated.

Original languageEnglish
Pages (from-to)2431-2442
Number of pages12
JournalChemistry of Materials
Volume18
Issue number9
DOIs
Publication statusPublished - May 2 2006

Fingerprint

Charge injection
Organic light emitting diodes (OLED)
Adsorbates
Luminance
Tin oxides
Indium
Anodes
Self assembled monolayers
Molecular structure
Thickness control
Molecules
Level control
Electroluminescence
Aluminum
Quantum efficiency
Self assembly
Heterojunctions
Tuning
Fluxes
indium tin oxide

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

Cite this

Systematic investigation of nanoscale adsorbate effects at organic light-emitting diode interfaces. Interfacial structure - Charge injection - Luminance relationships. / Huang, Qinglan; Li, Jianfeng; Evrnenenko, Guennadi A.; Dutta, Pulak; Marks, Tobin J.

In: Chemistry of Materials, Vol. 18, No. 9, 02.05.2006, p. 2431-2442.

Research output: Contribution to journalArticle

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