Repozytorium publikacji - Politechnika Gdańska

This research article explores the distinct TADF efficiency of three donor-acceptor based regio-isomers: DPAOCN (ortho- isomer), DPAMCN (meta-isomer), and DPAPCN (para-isomer). DPAPCN exhibits maximum TADF efficiency in both solution and solid-state with an impressive reverse inter-system crossing (RISC) rate of ~ 106 s-1; the underlying cause being the minimum singlet-triplet splitting energy or ∆EST and maximum SOC (spin-orbit coupling) between the S1 & T1 states. Apart from TADF, differences in crystal packing of the regio-isomers result in intriguing bulk phase properties. DPAOCN, with its non-centrosymmetric P212121 space group and substantial crystal void volume, enchants with reversible tri-color mechanochromic luminescent behavior, while the meta and para isomers, due to their centrosymmetric packing and diminished crystal void volume, remain inert to mechanical pressure. Expanding the horizon of possibilities, the non- centrosymmetric nature of ortho-isomer further renders it an excellent SHG material, with the χ(2) value of 0.19 pm/V at 1220 nm and laser-induced damage threshold (LIDT) value of 13.27 GW/cm2. Overall, a comprehensive investigation into the regio-isomers has been carried out, encompassing their TADF, SHG, and mechanochromic luminescent properties.

Autorzy

• dr Subrahmanyam Sappati link otwiera się w nowej karcie ,
• Abhijit Chatterjee,
• PhD Chatterjee Joy,
• Mazurka Lahiri,
• Mandal Pankaj,
• Partha Hazra