Thermally Activated Delayed Fluorescence (TADF) was invented by Dr. Chihaya Adachi and his research group in Kyushu University. TADF is recognized as the third generation of OLED emitting mechanisms and enables 100% internal quantum efficiency in OLEDs without using rare metals such as Iridium that are required for high efficient emission in phosphorescence. Hyperfluorescence was also invented in Kyushu University as the fourth generation emitting mechanism by combining Fluorescence and TADF to achieve highly efficient emission, very low cost and high color purity, providing the best overall emission mechanism to date. Kyulux Inc. is focused on commercialization of TADF and Hyperfluorescence for the next generation of OLED Display and lighting.
TADF & Hyperfluorescence: the emerging de facto standards for OLED!
A typical TADF
Mechanisms of TADF
A molecule that has a small energy gap between singlet and triplet energy states (⊿Est), enables up-conversion of excited energy from triplet to singlet spin. This provides highly efficient photonic emission from the singlet energy state in the form of delayed fluorescence.
Mechanisms of Hyperfluorescence
Both TADF and Fluorescence are co-deposited with a host molecule in Emissive Layer (EML) of an OLED device. The TADF molecule generates excitons, and the excited energy transfers to a fluorescent molecule. The fluorescent molecule then emits light four times more than conventional fluorescence with the same input energy. Hyperfluorescence provides the ultimate emission mechanism with high efficiency, low cost and high color purity – all without the use of precious metals.