In 2016, Researchers from Japan's Semiconductor Energy Laboratory (SEL) announced a new OLED device architecture, called ExTET ('exciplex triplet energy transfer'), that can increase the performance of OLED devices. The technology was applied for a patent in 2011.
The ExTET technology, which is a modification of the host material and the EML layer in phosphorescent OLED devices, have since been introduced to commercial AMOLED panels, increasing the efficiency and lifetime of the materials, while also lowering the drive voltage.
In recognition of the ExTET technology, SEL has been awarded with Japan's National Invention Commendation Award in 2018. SEL has built a comprehensive patent portfolio with a wide geographical coverage including the U.S., Japan, China, South Korea and Germany covering the ExTET technology. One of the basic German patents was opposed in 2018 and has recently been upheld in slightly amended form by a final decision of the Federal Patent Court of Germany.
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