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Convenient Synthesis and Characterization of Silane-Capped Polysiloles for the Fabrication of Luminescent OLED

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Abstract:

Catalytic dehydropolymerization and subsequent silane-capping with R2 SiHCl (R = Ph, Me)of 1,1-dihydrotetraphenylsilole (1) using various inorganic hydrides produces electroluminescent silane-capped polysiloles (2)in high yield. The polymerization yield and molecular weight increase in the order LiB[CH(CH3)C2H5]3H < NaB[CH(CH3)C2H5]3H < KB[CH(CH3)C2H5]3H. The molecular weights increase in the order Na[H2Al(OCH2CH2OCH3)2] < KB[CH(CH3)C2H5]3H < LiB(C2H5)3H. The silane-capped polysiloles 2 emit at 521 nm and are electroluminescent at 522 nm. The fluorescence quantum yield of 2 in toluene is (1.67 ± 0.31) × 10−2. The emission color is green and the maximum brightness of the device is 2,900 cd/m2 with a luminous efficiency of 0.69 lm/W. The substituent type of silyl end group showed no appreciable effect on the luminescent properties of polysilole backbone. Thus, the silane-capped polysiloles are found to be a good material for OLED fabrication. A possible mechanism for the formation of 2 was suggested.

Keywords: DEHYDROPOLYMERIZATION; ELECTROLUMINESCENCE; GREEN LIGHT; OLED FABRICATION; PHOTOLUMINESCENCE; SILANE-CAPPED POLYSILOLE

Document Type: Research Article

DOI: https://doi.org/10.1166/jnn.2008.IC32

Publication date: 2008-09-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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