Charge Balance and Exciton Confinement in Phosphorescent Organic Light Emitting Diodes

Thin red “sensing layers” are used to measure exciton confinement and charge balance in blue phosphorescent light emitting diodes. The device stability and efficiency are improved by preventing triplet exciton leakage from the emission zone. The results are explained using a quantitative model for charge and exciton transport. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.