What's New 2022.9.23 Paper A review entitled “Narrowband emissive thermally activated delayed fluorescence materials” by Kim and Yasuda has been published in Adv. Optical Mater. (the Hall of Fame series). 2022.7.14 Seminar A special seminar by Prof. Partha Hazra (IISER, India) was held in Inamori Center. 2022.5.27 Paper A paper entitled “Ultrafast triplet–singlet exciton interconversion in narrowband blue organoboron emitters doped with heavy chalcogens” by Park et al. has been published in Angew. Chem. Int. Ed. 2022.5.12 Paper A paper entitled “Blue thermally activated delayed fluorescence with sub-microsecond short exciton lifetimes: Acceleration of triplet–singlet spin interconversion via quadrupolar charge-transfer states” by Min et al. has been published in Adv. Optical Mater. 2022.3.21 Paper A paper entitled “Axially chiral 1,1’-bicarbazolyls with near-ultraviolet circularly polarized luminescence” by Shikita et al. has been published in Chem. Commun. 2022.3.20 Information The website of Yasuda Lab has been renewed.