About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Publication
Chemical Physics Letters
Paper
Bias-tuned reduction of self-absorption in polymer blend electroluminescence
Abstract
We present a concentration- and bias-dependent electroluminescence study on MEH-PPV aggregation in a binary polymer blend with the blue-emitting Me-LPPP as host. In low-concentration blends the spectral features of MEH-PPV peak at 560 nm, identical to its photoluminescence spectrum in dilute solution, and therefore suggesting effective hindering of aggregation-induced self-absorption. At higher concentrations the electroluminescence spectra are dominated by MEH-PPV peaking at 600 nm and a dramatic shift of spectral weight to the 560 nm peak is observed with increasing bias. We attribute this novel effect to a reduction of self-absorption caused by either photo- or charge-induced bleaching.