Quantification of charge carrier density in organic light-emitting diodes by time-resolved electroluminescence

Caroline Weichsel; Sebastian Reineke; Malte C. Gather; Karl Leo; Björn Lüssem

doi:10.1117/12.929586

13 September 2012 Quantification of charge carrier density in organic light-emitting diodes by time-resolved electroluminescence

Caroline Weichsel, Sebastian Reineke, Malte C. Gather, Karl Leo, Björn Lüssem

Author Affiliations +

Proceedings Volume 8476, Organic Light Emitting Materials and Devices XVI; 84761I (2012) https://doi.org/10.1117/12.929586
Event: SPIE Organic Photonics + Electronics, 2012, San Diego, California, United States

Abstract

Excessive charge carrier densities in the emission layer of organic light-emitting diodes (OLEDs) can lead to significant quenching by triplet-polaron-annihilation [1] or field-induced quenching [2]. Thus, to increase the efficiency of OLEDs further, a technique for the reliable determination of charge carrier densities in OLEDs is most desirable. Time-resolved spectroscopy is a powerful tool to investigate electronic and excitonic transfer processes [3]. By application of a voltage pulse to a phosphorescent state-of-the-art OLED we find a transient overshoot after voltage turn-off. This has primarily been found in phosphorescent OLEDs and has typically been attributed to delayed recombination of trapped charge carriers [4-7]. In this contribution we investigate charge carrier accumulation within the emission layer (EML) and provide a method to quantify the density of stored electrons.

Citation Download Citation

Caroline Weichsel, Sebastian Reineke, Malte C. Gather, Karl Leo, and Björn Lüssem "Quantification of charge carrier density in organic light-emitting diodes by time-resolved electroluminescence", Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 84761I (13 September 2012); https://doi.org/10.1117/12.929586

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