Air-stable, cross-linkable, hole-injecting/transporting interlayers for improved charge injection in organic light-emitting diodes

Jianfeng Li, Tobin J Marks

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Modification of inorganic electrode surfaces has attracted great attention in the quest to optimize organic optoelectronic devices. An air-stable, cross-linkable trimethoxysilane functionalized hole-transporting triarylamine (4,4′-bis[(p-trimethoxysilylpropylphenyl)phenylamino]biphenyl, TPD-[Si(OMe)3]2) has been synthesized and self-assembled or spin-coated onto tin-doped indium oxide (ITO) anode surfaces to form monolayers or multilayer siloxane films, respectively. The modified ITO surfaces were characterized by advancing aqueous contact angle, X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and cyclic voltammetry (CV). Increased surface work function and enhanced ITO-hole transport layer (HTL) contact via robust covalent bonding are expected to facilitate hole injection from the ITO anode, resulting in organic light-emitting diode (OLED) performance enhancement versus that of a device without such interlayers. For a device having the structure ITO/spin-coated-TPD-[Si(OMe)3]2 from aqueous alcohol + acetic acid blend solution (40 nm)/NPB (20 nm)/Alq (60 nm)/LiF (1 nm)/Al (100 nm), a maximum light output of 32 800 cd/m2, a 4.25 V turn-on voltage, and a maximum current efficiency of 5.8 cd/A is achieved. This performance is comparable to or superior to that of analogous devices prepared with analogous trichorosilyl precursors. The air-stable interlayer material developed here is also applicable to large-area coating techniques.

Original languageEnglish
Pages (from-to)4873-4882
Number of pages10
JournalChemistry of Materials
Volume20
Issue number15
DOIs
Publication statusPublished - Aug 12 2008

Fingerprint

Charge injection
Organic light emitting diodes (OLED)
Temperature programmed desorption
Air
Anodes
Siloxanes
Coating techniques
Tin
Multilayer films
Acetic acid
Acetic Acid
Optoelectronic devices
Indium
Cyclic voltammetry
Contact angle
Monolayers
Atomic force microscopy
Alcohols
X ray photoelectron spectroscopy
Electrodes

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

Cite this

Air-stable, cross-linkable, hole-injecting/transporting interlayers for improved charge injection in organic light-emitting diodes. / Li, Jianfeng; Marks, Tobin J.

In: Chemistry of Materials, Vol. 20, No. 15, 12.08.2008, p. 4873-4882.

Research output: Contribution to journalArticle

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