DOI: 10.1002/sdtp.16495 ISSN:
9‐1: Invited Paper: Triplet‐Triplet Annihilation at Organic Semiconductor Interface for Efficient Solid‐State Photon Upconversion and Organic Light‐Emitting Diodes with Low Driving Voltage
Seiichiro Izawa- General Medicine
Triplet–triplet annihilation (TTA) can double the energy of excited states. We utilized a charge transfer state at an organic semiconductor interface as a precursor for efficient TTA. As a result, a solid‐state photon upconversion from near‐infrared to visible light is achieved with an efficiency that is two orders of magnitude higher than those demonstrated by conventional systems. Furthermore, it is demonstrated that an efficient organic light‐emitting diode (OLED) can be operated by only a 1.5 V battery.