Thermally activated delayed fluorescence (TADF) from $Sn^{4+}$-porphyrin complexes and their application to organic light emitting diodes - novel pathway for high efficiency electroluminescence

We developed $Sn^{4+}$-porphyrin complexes that show thermally activated delayed fluorescence (TADF). TADF intensities increased with an increase of temperature because of an acceleration of the reverse intersystem crossing from triplet to singlet excited states by heat activation. TADF component provides a novel pathway for high efficiency OLEDs.