Non-radiative recombination losses in polymer light-emitting diodes |
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Authors: | M Kuik LJA Koster AG Dijkstra GAH Wetzelaer PWM Blom |
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Affiliation: | 1. Molecular Electronics, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh, 4, 9747 AG Groningen, The Netherlands;2. Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan;3. Holst Centre, High Tech Campus, 31, 5656 AE Eindhoven, The Netherlands |
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Abstract: | We present a quantitative analysis of the loss of electroluminescence in light-emitting diodes (LEDs) based on poly2-methoxy-5-(2′-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV) due to the combination of non-radiative trap-assisted recombination and exciton quenching at the metallic cathode. It is demonstrated that for an MEH-PPV LED the biggest efficiency loss, up to 45%, arises from extrinsic non-radiative recombination via electron traps. The loss caused by exciton quenching at the cathode proves only to be significant for devices thinner than 100 nm. Removal of electron traps by purification is expected to enhance the efficiency of polymer LEDs by more than a factor of two. |
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