Excimer formation by electric field induction and side chain motion assistance in polyfluorenes
Lu, HH; Liu, CY; Jen, TH; Liao, JL; Tseng, HE; Huang, CW; Hung, MC; Chen, SA
| HERO ID | 4854540 |
|---|---|
| In Press | No |
| Year | 2005 |
| Title | Excimer formation by electric field induction and side chain motion assistance in polyfluorenes |
| Authors | Lu, HH; Liu, CY; Jen, TH; Liao, JL; Tseng, HE; Huang, CW; Hung, MC; Chen, SA |
| Journal | Macromolecules |
| Volume | 38 |
| Issue | 26 |
| Page Numbers | 10829-10835 |
| Abstract | For poly(9,9-di(6-(2-(3-oxetanyl)butoxyl)hexyl)-2,7-fluorene) (POBOHF), measurements on field induction-thermally stimulated current (FI-TSC) and electroluminescence (EL) under a wide temperature range demonstrate that electric field induction (FI) accompanied by side chain motion can lead to a formation of excimers, which contribute to a growth of a green component in the EL spectrum. This phenomenon also happens to poly(9,9-di-n-octyl-2,7-fluorene) (PFO), especially under long-term operations with higher electric fields (1 x 10(6) V/cm), copolymers of OBOHF and FO (PF-1/1 and PF-1/3), and even cross-linked POBOHF. The higher polarity of the side chain in the polyfluorenes (PFs) can cause a more pronounced FI effect. For POBOHF, the green component can even dominate after a few cycles of device operation. Lowering the content of cross-linkable commoner in the copolymers from 50 to 25 mol % only moderately suppresses the formation of FI excimers. |
| Doi | 10.1021/ma051594z |
| Wosid | WOS:000234203900027 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |