Bipolar 1,8-naphthalimides showing high electron mobility and red AIE-active TADF for OLED applications.

Aiming to design bipolar organic semiconductors with high electron mobility and efficient red thermally activated delayed fluorescence (TADF), three donor-acceptor compounds were designed and synthesized selecting 1,8-naphthalimide as an acceptor and phenoxazine, 3,7-di--butylphenothiazine or 2,7-di--butyldimethyl-9,10-dihydroacridine as donor moieties. Aggregation induced emission enhancement was detected for the compounds causing efficient TADF in the solid-state. Photoluminescence quantum yields up to 77% were observed for the films of the compounds doped in a host.

Aggregate Formation of Boron-Containing Molecules in Thermal Vacuum Deposited Films.

The spectral properties of new boron-containing dyes were studied. One-component (pure dyes) and composite "Alq+dye" thin films were fabricated using the thermal vacuum deposition method. The positions of the transmission spectra maxima in a one-component film are different for different film thicknesses.