Luminous Butterflies: Efficient Exciton Harvesting by Benzophenone Derivatives for Full-Color Delayed Fluorescence OLEDs


  • This work was supported by a Grant-in-Aid from the Funding Program for World-Leading Innovation R&D on Science and Technology (FIRST), Precursory Research for Embryonic Science and Technology (PRESTO) from JST (no. 10111), and from JSPS Young Scientist (A) (no. 25708032). C.A. and T.Y. acknowledge the support of WPI-I2CNER, sponsored by MEXT (Japan). OLEDs=organic light-emitting diodes.


Butterfly-shaped luminescent benzophenone derivatives with small energy gaps between their singlet and triplet excited states are used to achieve efficient full-color delayed fluorescence. Organic light-emitting diodes (OLEDs) with these benzophenone derivatives doped in the emissive layer can generate electroluminescence ranging from blue to orange–red and white, with maximum external quantum efficiencies of up to 14.3 %. Triplet excitons are efficiently harvested through delayed fluorescence channels.