Realizing Green Phosphorescent Light-Emitting Materials from Rhenium(I) Pyrazolato Diimine Complexes

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Sudhir Ranjan
  • Shen-Yi Lin
  • Kuo-Chu Hwang
  • Wei-Li Ching
  • Chao-Shiuan Liu
  • Yu-Tai Tao
  • Chin-Hsiung Chien
  • Shie-Ming Peng
  • Gene-Hsiang Lee

Detail(s)

Original languageEnglish
Pages (from-to)1248-1255
Journal / PublicationInorganic Chemistry
Volume42
Issue number4
Online published17 Jan 2003
Publication statusPublished - 24 Feb 2003
Externally publishedYes

Abstract

Two neutral pyrazolato diimine rhenium(I) carbonyl complexes with formula [Re(CO)3(N-N)(btpz)] where N-N = 2,2′-bipyridine (1) and 1,10-phenanathroline (2), and btpz = 3,5-bis(trifluoromethyl) pyrazolate, were synthesized and characterized by elemental analysis, routine spectroscopic methods, and single-crystal X-ray diffraction study. Ground and excited state properties of these complexes were investigated by steady-state and time-resolved spectroscopies. Complexes 1 and 2 show photoluminescent emission in both solution and solid-state at room temperature, arising from metal to ligand charge-transfer (MLCT) transition with strong overlapping of intraligand π π* transitions. The long-lived excited state lifetimes of complexes 1 and 2, which are on the order of microseconds, indicate the presence of phosphorescent emission. As these complexes hold the potential to serve as phosphors for organic light-emitting diodes (OLEDs), their electroluminescent performances were evaluated by employing them as dopants of various electron transport layer (ETL) or hole transport layer (HTL) hosts. For complex 1, a green electrophosphorescence emission centered at λmax = 530 nm was observed at low turn-on voltage (∼6 V) with luminous power efficiency of 0.72 Im/W, external quantum efficiency of 0.82%, and luminance of 2300 cd/m2 at a current density of 100 mA/cm2.

Research Area(s)

Citation Format(s)

Realizing Green Phosphorescent Light-Emitting Materials from Rhenium(I) Pyrazolato Diimine Complexes. / Ranjan, Sudhir; Lin, Shen-Yi; Hwang, Kuo-Chu et al.
In: Inorganic Chemistry, Vol. 42, No. 4, 24.02.2003, p. 1248-1255.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review