| Autor: |
Mauthner, G., Collon, M., List, E. J. W., Wenzl, F. P., Bouguettaya, M., Reynolds, J. R. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 3/15/2005, Vol. 97 Issue 6, p063508, 5p, 6 Graphs |
| Abstrakt: |
We demonstrate that utilizing a blue light-emitting oligo(ethylene oxide)-grafted conjugated poly(p-phenylene) (PPP-OR11) as an active layer in a light-emitting electrochemical cell (LEC) preserves a color-stable blue light emission. This is in contrast to the polymer light-emitting diodes (PLEDs) constructed using the same emitting polymer without ionic species, which exhibits a rapid red shifting of the emission to a distinct green. We attribute the color shift to various degradation processes caused by oxidative degradation and aluminum deposition-induced defects in PPP-OR11. The analysis of the degradation processes in the PLEDs shows that the color stability in the LEC is caused by a controlled shift of the recombination zone from the defects including cathode/polymer interface to an undoped intrinsic zone between the p- and n-type regions of the active layer in the LECs, which qualifies the LEC type devices as a cost-effective approach to the single layer color-stable blue emitting devices. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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