Synthesis, Characterization, and Photophysical Properties of Os(II) Diimine Complexes [Os(NN)(CO)2I2] (N![]()
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- 作者：Yao-Lun Chen ; Shih-Wen Lee ; Yun Chi ; Kuo-Chu Hwang ; Sujit Baran Kumar ; Ya-Hui Hu ; Yi-Ming Cheng ; Pi-Tai Chou ; Shie-Ming Peng ; Gene-Hsiang Lee ; Shi-Jay Yeh ; and Chin-Ti Chen
- 刊名：Inorganic Chemistry
- 出版年：2005
- 出版时间：June 13, 2005
- 年：2005
- 卷：44
- 期：12
- 页码：4287 - 4294
- 全文大小：361K
- 年卷期：v.44,no.12(June 13, 2005)
- ISSN：1520-510X
文摘
A new series of Os(II) diimine complexes with the general formula [Os(N
N)(CO)2I2], NN = 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 characterizedby spectroscopic methods and by a single-crystal X-ray diffraction study on the dpphen complex 3. The correspondingphotophysical properties were studied using UV-vis and emission spectrometry. The resulting phosphorescencefeatures both in solution and as a solid film, in combination with the MO calculation, lead us to conclude that theemissions originate from mixed halide-to-ligand (XLCT ~70%) and metal-to-ligand (MLCT ~30%) transitions insteadof the typical MLCT transition. Using complexes 4 and 5 as the dopant emitters, we evaluated their potential toserve as a phosphor for organic light emitting diodes by examining their electroluminescent performances. Reddishorange 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/Aor 2.7 lm/W), and the peak luminance was shown to be 5600 cd/m2 at a driving voltage of ~15 V.
N)(CO)2I2], NN = 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 characterizedby spectroscopic methods and by a single-crystal X-ray diffraction study on the dpphen complex 3. The correspondingphotophysical properties were studied using UV-vis and emission spectrometry. The resulting phosphorescencefeatures both in solution and as a solid film, in combination with the MO calculation, lead us to conclude that theemissions originate from mixed halide-to-ligand (XLCT ~70%) and metal-to-ligand (MLCT ~30%) transitions insteadof the typical MLCT transition. Using complexes 4 and 5 as the dopant emitters, we evaluated their potential toserve as a phosphor for organic light emitting diodes by examining their electroluminescent performances. Reddishorange 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/Aor 2.7 lm/W), and the peak luminance was shown to be 5600 cd/m2 at a driving voltage of ~15 V.