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Keeping it light: Most organic fluorophores do not show useful emission from the triplet excited state. A new class of materials is presented for organic light-emitting diodes that exhibit phosphorescence under electrical excitation, even at room temperature, without employing the heavy-atom effect. Blocking of internal conversion is so effective that emission from higher-lying triplet states, above the singlet, can be observed at low temperature. 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.
Chaudhuri et al. (Thu,) studied this question.