Dual-function molecule powers OLEDs and sharp medical imaging

Researchers at Kyushu University have developed a novel organic molecule, CzTRZCN, that uniquely combines two previously conflicting properties: strong thermally activated delayed fluorescence (TADF) for efficient light emission in OLED displays, and high two-photon absorption (2PA) for safer, high-precision deep-tissue medical imaging. This dual-function molecule features a design that allows it to maintain orbital overlap during light absorption for effective 2PA, then switch to a twisted structure that enables TADF emission. In OLED devices, CzTRZCN achieved a record external quantum efficiency of 13.5% for triazine-based TADF materials, while also demonstrating promising brightness and biocompatibility for medical imaging applications. The breakthrough addresses the longstanding challenge of merging the planar structures needed for 2PA with the twisted configurations favored by TADF, enabling a single molecule to serve both consumer electronics and biomedical diagnostics. The metal-free, low-toxicity nature of CzTRZCN makes it suitable for