Iridium(I) pyridyl azolate complexes with saturated red metal-to-ligand charge transfer phosphorescence; Fundamental and potential applications in organic light-emitting diodes

Chung Hong Fang, Yao Lun Chen, Cheng Han Yang, Yun Chi, Yu Shan Yeh, Elise Yu-Tzu Li, Yi Ming Cheng, Chia Jung Hsu, Pi Tai Chou, Chin Ti Chen

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Preparation of a new series of neutral metal complexes [(cod)Ir-(fppz)] (1), [(cod)Ir(bppz)] (2), [(cod)Ir(fptz)] (3) and [(cod)Ir(bptz)] (4). bearing one cod ligand and a pyridyl azolate chelate are reported. A single-crystal X-ray diffraction study of 3 reveals the expected distorted square-planar geometry. The lowest absorption band consists of Ir1 atom increased triplet dπ-→* transitions (3MLCT), the assignment of which is firmly supported by the theoretical approaches. Complexes 1-4 exhibit weak phosphorescence in degassed solution at room temperature, whereas much more intense, solid-state phosphorescence appears in the range 622-649 nm. The pure MLCT emission was used as a prototypical model to address its remarkable spectral differences from the IrIII isoquinoline pyrrolide complex (5), which has mainly 3ππ phosphorescence. Complex 3 was used as a dopant to fabricate red-emitting phosphorescent organic light-emitting diodes (OLEDs). For the 7% doped device, a maximum brightness of 3010 cdm-2 was achieved at an applied voltage of 15 V and with CIE coordinates of (0.56, 0.33). demonstrating for the first time the potential of neutral Ir1 complexes in OLED applications.

Original languageEnglish
Pages (from-to)2689-2694
Number of pages6
JournalChemistry - A European Journal
Volume13
Issue number9
DOIs
Publication statusPublished - 2007 Jun 26
Externally publishedYes

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Gadiformes
Iridium
Phosphorescence
Organic light emitting diodes (OLED)
Charge transfer
Metals
Ligands
Light
Bearings (structural)
Coordination Complexes
Metal complexes
Absorption spectra
Luminance
Doping (additives)
X-Ray Diffraction
Single crystals
X ray diffraction
Atoms
Geometry
Electric potential

Keywords

  • Cyclooctene
  • Iridium
  • Phosphorescence
  • Photochemistry
  • Pyridyl azolate

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

Cite this

Iridium(I) pyridyl azolate complexes with saturated red metal-to-ligand charge transfer phosphorescence; Fundamental and potential applications in organic light-emitting diodes. / Fang, Chung Hong; Chen, Yao Lun; Yang, Cheng Han; Chi, Yun; Yeh, Yu Shan; Li, Elise Yu-Tzu; Cheng, Yi Ming; Hsu, Chia Jung; Chou, Pi Tai; Chen, Chin Ti.

In: Chemistry - A European Journal, Vol. 13, No. 9, 26.06.2007, p. 2689-2694.

Research output: Contribution to journalArticle

Fang, Chung Hong ; Chen, Yao Lun ; Yang, Cheng Han ; Chi, Yun ; Yeh, Yu Shan ; Li, Elise Yu-Tzu ; Cheng, Yi Ming ; Hsu, Chia Jung ; Chou, Pi Tai ; Chen, Chin Ti. / Iridium(I) pyridyl azolate complexes with saturated red metal-to-ligand charge transfer phosphorescence; Fundamental and potential applications in organic light-emitting diodes. In: Chemistry - A European Journal. 2007 ; Vol. 13, No. 9. pp. 2689-2694.
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abstract = "Preparation of a new series of neutral metal complexes [(cod)Ir-(fppz)] (1), [(cod)Ir(bppz)] (2), [(cod)Ir(fptz)] (3) and [(cod)Ir(bptz)] (4). bearing one cod ligand and a pyridyl azolate chelate are reported. A single-crystal X-ray diffraction study of 3 reveals the expected distorted square-planar geometry. The lowest absorption band consists of Ir1 atom increased triplet dπ-→* transitions (3MLCT), the assignment of which is firmly supported by the theoretical approaches. Complexes 1-4 exhibit weak phosphorescence in degassed solution at room temperature, whereas much more intense, solid-state phosphorescence appears in the range 622-649 nm. The pure MLCT emission was used as a prototypical model to address its remarkable spectral differences from the IrIII isoquinoline pyrrolide complex (5), which has mainly 3ππ phosphorescence. Complex 3 was used as a dopant to fabricate red-emitting phosphorescent organic light-emitting diodes (OLEDs). For the 7{\%} doped device, a maximum brightness of 3010 cdm-2 was achieved at an applied voltage of 15 V and with CIE coordinates of (0.56, 0.33). demonstrating for the first time the potential of neutral Ir1 complexes in OLED applications.",
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AU - Chi, Yun

AU - Yeh, Yu Shan

AU - Li, Elise Yu-Tzu

AU - Cheng, Yi Ming

AU - Hsu, Chia Jung

AU - Chou, Pi Tai

AU - Chen, Chin Ti

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