Abstract
The internal luminescencequantum efficiencyqq is one limiting factor for the performance of organic light-emitting diodes.Photoluminescencemeasurements are frequently used to estimate qq but these neglect effects of the local environment of the emissive sites and the electrical excitation mechanism. We present a method for the in situmeasurement of qq under electrical operation. The current efficiency of several devices with different emitter-cathode distances is quantitatively compared. Precise optical simulation allows determining qq without additional assumptions.
Original language | English |
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Pages (from-to) | 263306 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 95 |
Issue number | 26 |
DOIs | |
Publication status | Published - 29 Dec 2009 |
Keywords
- Organic light emitting diodes
- Laser efficiency
- CATHODES
- LUMINESCENCE
- Quantum measurement theory