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 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 4287-4294 |
Journal / Publication | Inorganic Chemistry |
Volume | 44 |
Issue number | 12 |
Online published | 18 May 2005 |
Publication status | Published - 1 Jun 2005 |
Externally published | Yes |
Link(s)
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 et al.
In: Inorganic Chemistry, Vol. 44, No. 12, 01.06.2005, p. 4287-4294.
In: Inorganic Chemistry, Vol. 44, No. 12, 01.06.2005, p. 4287-4294.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review