Abstract
We report efficient and bright organic light-emitting devices operated by capacitive energy coupling. In this approach, the organic layers are enclosed between sputter-deposited hafnium dioxide layers to prevent charge carrier injection. When a sinusoidal voltage signal is applied to the electrodes, the devices emit bright green light whereas no detectable emission is generated upon application of a constant voltage. The efficiency of the process depends heavily on the frequency of the applied voltage signal. By optimizing the driving scheme, a record luminous efficacy for AC driven OLEDs of 2.7 lm/W at 500 cd/m(2) is achieved. (c) 2013 Elsevier B.V. All rights reserved.
Original language | English |
---|---|
Pages (from-to) | 809-813 |
Number of pages | 5 |
Journal | Organic Electronics |
Volume | 14 |
Issue number | 3 |
DOIs | |
Publication status | Published - Mar 2013 |
Keywords
- Alternating current
- Organic light-emitting device
- Hafnium dioxide
- IMPACT EXCITATION
- ELECTROLUMINESCENCE
- ZNS
- LUMINESCENCE
- EMISSION
- FILMS
- LEDS