Kyulux develops materials for OLED display and lighting panels, with a focus on TADF and Hyperfluorescence emitter and host materials.
The emissive layer of an OLED, comprised of an emitter and a host, is the heart of the OLED panel, where the electric charge is converted into light.
The original fluorescence OLED emitters converted only 25% of the electricity into light. 2nd-Gen phosphorescent emitters achieve an IQE of 100%, but require doping by heavy metals – which limits the molecule design freedom (and also, a blue phosphorescent emitter has yet to be developed).
TADF (Thermally Activated Delayed Fluorescence) emitters, first developed in 2012, achieve 100% IQE without any rare metals, and are so believed to be the future of OLEDs. TADF emitters were invented by Dr. Chihaya Adachi and his research group in Kyushu University.
Kyulux develops hyperfluorescence OLEDs, which combine TADF and fluorescence emitters to enable highly efficient emission (100% IQE), low cost and high color purity. Hyperfluorescence was invented at Kyushu University by Dr. Chihaya Adachi and the technology is exclusively licensed to Kyulux.
Kyulux’s first aim is to develop commercial red, green and yellow hyperfluorescence emitter/host combinations, to replace the 2nd-Gen phosphorescent emitters currently used in OLED displays and lighting panels.
How does TADF work?
TADF molecules have a small energy gap between the singlet and the triplet energy states (⊿Est). This enables up-conversion of excited energy from triplet to singlet spin, which provides highly efficient photonic emission from the singlet energy state in the form of delayed fluorescence.
How does hyperfluorescence work?
In hyperfluorescence, the emissive layer is comprised of both TADF and fluorescence emitting materials. The TADF molecule generates excitons, and the excited energy transfers to a fluorescent molecule. The fluorescent molecule then emits four times more light 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.