High Yields of Singlet Excitons in Organic Electroluminescence through Two Paths of Cold and Hot Excitons

A very high singlet exciton ratio (∼93%) in the electroluminescence of the triphenylamine-thiadiazole molecule TPA-NZP is attributed to reverse intersystem crossing (T→S) along the high-lying charge-transfer state channel, denoted the “hot exciton” mechanism. Compared with a “cold exciton” mechanism, this may be a good strategy for designing the next generation of organic light-emitting materials with high exciton utilization efficiency and high exciton radiation efficiency. 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.