Synthesis, Characterization, and Photophysical Properties of Os(II) Diimine Complexes [Os(N∧N)(CO)2l2] (N∧N = Bipyridine, Phenanthroline, and Pyridyl Benzoxazole)

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yao-Lun Chen
  • Shih-Wen Lee
  • Kuo-Chu Hwang
  • Sujit Baran Kumar
  • Ya-Hui Hu
  • Yi-Ming Cheng
  • Pi-Tai Chou
  • Shie-Ming Peng
  • Gene-Hsiang Lee
  • Shi-Jay Yeh
  • Chin-Ti Chen

Detail(s)

Original languageEnglish
Pages (from-to)4287-4294
Journal / PublicationInorganic Chemistry
Volume44
Issue number12
Online published18 May 2005
Publication statusPublished - 1 Jun 2005
Externally publishedYes

Abstract

A new series of Os(II) diimine complexes with the general formula [Os(N∧N)(CO)2I2], N∧N = 2,2‘-bipyridine (bpy) (1), 4,4‘-di-tert-butyl-2,2‘-bipyridine (dbubpy) (2), 4,7-diphenyl-1,10-phenanthroline (dpphen) (3), 2-(2‘-pyridyl)benzoxazole (pboz) (4), and 5-tert-butyl-2-(2‘-pyridyl)benzoxazole (bupboz) (5), were synthesized and characterized by spectroscopic methods and by a single-crystal X-ray diffraction study on the dpphen complex 3. The corresponding photophysical properties were studied using UV−vis and emission spectrometry. The resulting phosphorescence features both in solution and as a solid film, in combination with the MO calculation, lead us to conclude that the emissions originate from mixed halide-to-ligand (XLCT ∼70%) and metal-to-ligand (MLCT ∼30%) transitions instead of the typical MLCT transition. Using complexes 4 and 5as the dopant emitters, we evaluated their potential to serve as a phosphor for organic light emitting diodes by examining their electroluminescent performances. Reddish orange electroluminescence centered around 600 nm was observed for organic light emitting diodes (OLEDs) fabricated using complex 5 as the emitter; the device efficiency was shown to be as high as 2.8% (and 5.0 cd/A or 2.7 lm/W), and the peak luminance was shown to be 5600 cd/m2 at a driving voltage of ∼15 V.

Citation Format(s)

Synthesis, Characterization, and Photophysical Properties of Os(II) Diimine Complexes [Os(N∧N)(CO)2l2] (N∧N = Bipyridine, Phenanthroline, and Pyridyl Benzoxazole). / Chen, Yao-Lun; Lee, Shih-Wen; Chi, Yun; Hwang, Kuo-Chu; Kumar, Sujit Baran; Hu, Ya-Hui; Cheng, Yi-Ming; Chou, Pi-Tai; Peng, Shie-Ming; Lee, Gene-Hsiang; Yeh, Shi-Jay; Chen, Chin-Ti.

In: Inorganic Chemistry, Vol. 44, No. 12, 01.06.2005, p. 4287-4294.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review