Abstract
The frequency response of molecularly thin alternating-current polymeric light-emitting diodes has been studied. Langmuir-Blodgett (LB) films of poly(3-hexylthiophene) (PHT) were used as the active emitting material and the device was formed by sandwiching PHT films between LB films of emeraldine base polyaniline. As a step towards molecular electronic devices, we have shown that even two molecular layers of PHT (approximate to 6 nm) are sufficient for light emission. The high frequency operation limit of the device has been discussed in terms of a charge accumulation process at the polymer-polymer interface. The electroluminescence (EL) spectra of different structures have been compared with corresponding photoluminescence spectra. A significant blueshift in EL has been observed in thinner structures and its origin has been discussed. (C) 1998 American Institute of Physics. [S0021-8979(98)02103-3].
| Original language | Undefined/Unknown |
|---|---|
| Pages (from-to) | 1748–1752 |
| Number of pages | 5 |
| Journal | Journal of Applied Physics |
| Volume | 83 |
| Issue number | 3 |
| Publication status | Published - 1998 |
| MoE publication type | A1 Journal article-refereed |