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Issue 12, 2001
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Efficient blue emission from siloles

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2,3,4,5-Tetraphenylsiloles with different 1,1-substituents on the ring silicon atoms, i.e., 1,1-dimethyl-2,3,4,5-tetraphenylsilole (1), 1-methyl-1-(3-chloropropyl)-2,3,4,5-tetraphenylsilole (2), 1-methyl-1,2,3,4,5-pentaphenylsilole (3) and hexaphenylsilole (4), are synthesized and characterized. While all the siloles emit intense blue light readily observable by naked eyes under normal room illumination conditions, the film of their acyclic cousin without silicon, namely 1,2,3,4-tetraphenylbutadiene (5), does not fluoresce, revealing the vital role of the planar and rigid silacyclopentadiene ring in the solid-state photoluminescence process. The electronic transitions of the siloles can be tuned by varying the 1,1-substituents, and the inductive and conjugating effects of the aromatic rings confer low LUMO energy levels and high emission efficiencies on the phenyl-substituted siloles. The electroluminescence device of the 1-phenylsilole 3 shows a high brightness (4538 cd m−2 at 18 V) and an excellent external quantum efficiency (0.65% at 17 V and 94 mA cm−2).

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Publication details

The article was received on 08 Mar 2001, accepted on 23 Jul 2001 and first published on 18 Sep 2001

Article type: Paper
DOI: 10.1039/B102221K
Citation: J. Mater. Chem., 2001,11, 2974-2978

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    Efficient blue emission from siloles

    B. Z. Tang, X. Zhan, G. Yu, P. P. Sze Lee, Y. Liu and D. Zhu, J. Mater. Chem., 2001, 11, 2974
    DOI: 10.1039/B102221K

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