Stable Organic Blue-Light-Emitting Devices Prepared from Poly[spiro(fluorene-9,9‘-xanthene)]
| Autor: | Ajay Kumar Dixit, Ching-Fong Shu, Ping-I Shih, Yi-Hung Liu, Ya-Hsien Tseng, Gene-Hsiang Lee, Chen-Han Chien |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Macromolecules. 38:10055-10060 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma051798f |
| Popis: | A short, efficient synthetic route has been developed for the preparation of 2,7-dibromospiro[fluorene-9,9‘-(2‘,7‘-di-n-octyloxyxanthene)], which was subsequently polymerized with the corresponding diborolane through Suzuki coupling to afford a fluorene-based homopolymer, PSFX, that contains a spiroxanthene group functionalized on the C-9 position of each fluorene repeat unit. Single-crystal X-ray diffraction analysis of the dibromo monomer revealed that the spiro-fused fluorene and xanthene moieties lie perpendicular to one another. As a consequence of the incorporation of the spiro pendant group, PSFX possesses a high glass transition temperature and good thermal stability while displaying its stable blue emission in the solid state. A light-emitting diode device prepared using PSFX as the emitting layer exhibits an efficient, stable blue emission; it has a turn-on voltage of 6 V and a maximum external quantum efficiency of 1.74% ph/el. Even when the brightness was increased up to 103 cd/m2 (ca. 11 V), ... |
| Databáze: | OpenAIRE |
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