Tetradentate Platinum Complexes for Efficient and Stable Excimer-Based White OLEDs

Tyler Fleetham, Liang Huang, Jian Li

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

A series of tetradentate platinum complexes that exhibit both efficient monomer and excimer emission are synthesized. Via small modifications to the cyclometalating ligands, both the monomer and excimer emission energy can be separately tuned. Devices employing all of the developed emitters demonstrate impressively high external quantum efficiencies (EQEs) within the range of 22% to 27% for concentrations between 2% and 16%. The halogen-free design of the complexes also enables the fabrication of single, doped, white organic light-emitting diodes (OLEDs) with long operational lifetimes. A balanced white device employing the complex Pt2O2, achieves a device operational lifetime to 80% of the initial luminance estimated at over 200 h at 1000 cd m-2, while also achieving 12.5% peak EQE for a warm white light with a color rendering index of 80. Furthermore, a highly doped device exhibiting nearly exclusive excimer emission showed an impressive operational lifetime, which is estimated at more than 400 h for 1000 cd m-2.

Original languageEnglish (US)
Pages (from-to)6066-6073
Number of pages8
JournalAdvanced Functional Materials
Volume24
Issue number38
DOIs
StatePublished - Oct 1 2014

Fingerprint

Organic light emitting diodes (OLED)
excimers
Platinum
Quantum efficiency
platinum
light emitting diodes
Monomers
Halogens
life (durability)
quantum efficiency
Luminance
monomers
Ligands
Color
Fabrication
luminance
halogens
emitters
color
ligands

Keywords

  • excimers
  • phosphorescence
  • platinum emitters
  • white organic light-emitting diodes

ASJC Scopus subject areas

  • Biomaterials
  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Tetradentate Platinum Complexes for Efficient and Stable Excimer-Based White OLEDs. / Fleetham, Tyler; Huang, Liang; Li, Jian.

In: Advanced Functional Materials, Vol. 24, No. 38, 01.10.2014, p. 6066-6073.

Research output: Contribution to journalArticle

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N2 - A series of tetradentate platinum complexes that exhibit both efficient monomer and excimer emission are synthesized. Via small modifications to the cyclometalating ligands, both the monomer and excimer emission energy can be separately tuned. Devices employing all of the developed emitters demonstrate impressively high external quantum efficiencies (EQEs) within the range of 22% to 27% for concentrations between 2% and 16%. The halogen-free design of the complexes also enables the fabrication of single, doped, white organic light-emitting diodes (OLEDs) with long operational lifetimes. A balanced white device employing the complex Pt2O2, achieves a device operational lifetime to 80% of the initial luminance estimated at over 200 h at 1000 cd m-2, while also achieving 12.5% peak EQE for a warm white light with a color rendering index of 80. Furthermore, a highly doped device exhibiting nearly exclusive excimer emission showed an impressive operational lifetime, which is estimated at more than 400 h for 1000 cd m-2.

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