Towards deep NIR emissive simple D-A-D dyes: A novel acceptor block providing Anti-Kasha’s rule emission

In this work we have developed 1,2,5-selenodiazolo[3,4-d]pyridazine as electron-withdrawing unit for donor-acceptor dyes providing bright room-temperature phosphorescence in near infrared (NIR) spectral region. The novel symmetrical and unsymmetrical fluorescent D-A-D...