標題: | Stable organic blue-light-emitting devices prepared from poly[spiro(fluorene-9,9'-xanthene)] |
作者: | Tseng, YH Shih, PI Chien, CH Dixit, AK Shu, CF Liu, YH Lee, GH 應用化學系 Department of Applied Chemistry |
公開日期: | 29-十一月-2005 |
摘要: | 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 10(3) cd/m(2) (ca. 11 V), the CIE color coordinates of the resulting EL spectrum remained in the deep-blue region (0.15, 0.07) and the device's efficiency was 1.33% ph/el. |
URI: | http://dx.doi.org/10.1021/ma051798f http://hdl.handle.net/11536/13052 |
ISSN: | 0024-9297 |
DOI: | 10.1021/ma051798f |
期刊: | MACROMOLECULES |
Volume: | 38 |
Issue: | 24 |
起始頁: | 10055 |
結束頁: | 10060 |
顯示於類別: | 期刊論文 |