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Heavy-Atom-Free Room-Temperature Phosphorescent Organic Light-Emitting Diodes Enabled by Excited States Engineering

submitted on 18.08.2020, 02:32 and posted on 19.08.2020, 05:40 by Heather Higginbotham, Masato Okazaki, Piotr de Silva, Satoshi Minakata, Youhei Takeda, Przemyslaw Data
Room temperature phosphorescence materials offer great opportunities for applications in optoelectronics, due to their unique photophysical characteristics. However, purely organic emitters that can realize distinct electrophosphorescence are rarely exploited. Herein a new approach for designing heavy-atom-free organic room temperature phosphorescence emitters for organic light-emitting diodes is presented. The subtle tuning of the energy diagrams of singlet and triplet excited states by appropriate choice of host matrix allows tailored emission properties and switching of emission channels between thermally activated delayed fluorescence and room temperature phosphorescence. Moreover, an efficient and heavy-atom-free room temperature phosphorescence organic light-emitting diodes using the developed emitter is realized.


the First Team program of the Foundation for Polish Science co-financed by the European Union under the European Regional Development Fund (project number: POIR.04.04.00-00-4668/17-00)

the EU’s Horizon 2020 for funding the OCTA project under grant agreement No 778158

Grant-in-Aid for Scientific Research on Innovative Area JP15H00997, JP17H05155, JP19H05716

the Research Grant from the Japan Prize Foundation

the Continuation Grants for Young Researchers from the Asahi Glass Foundation

the Research Grant in the Natural Science from the Mitsubishi Foundation


Email Address of Submitting Author


Osaka University



ORCID For Submitting Author


Declaration of Conflict of Interest

The authors declare no competing financial interest.

Version Notes

This is the version 1.0.