Bhatia, Harsh published the artcileAsymmetric-donor (D2D2)-acceptor (A) conjugates for simultaneously accessing intrinsic blue-RTP and blue-TADF, Formula: C8H4N2, the main research area is donor acceptor photoluminescent room temperature phosphorescence.
The development of new photoluminescent (PL) materials with simultaneous room-temperature phosphorescence (RTP) and thermally activated delayed fluorescence (TADF) features is highly desirable for bio-imaging, security applications and sensors due to the involvement of both singlet and longer-lived triplet states. Here, we report two carbazolyl-phenoxy-phthalonitrile conjugates (CPPN, CPPNF). Spectroscopic studies combining two daughter compounds (PPN, PPNF) in polar and nonpolar hosts confirmed efficient blue-RTP from the higher-energy triplet state (TPPN) due to the phenoxy-phthalonitrile (PPN) part, and blue-TADF via reverse intersystem crossing from the low-lying triplet state (TCzPN) of the carbazolyl-phthalonitrile (CzPN) part to the singlet (S1) state of the same CzPN part, utilizing the TPPN state that acts as an intermediate for spin-vibronic coupling. Such PL characteristics are observed due to the energetic proximity of 3LEPPN, 1CTCzPN and 3CTCzPN. In the hydrogen-bonded matrix and crystals, we found faint persistent green-RTP characteristics of the PPNF due to supramol. interactions and aggregation of the mol. This study could pave the way to understanding the involvement of different excited states associated with TADF and RTP processes of asym.-donor-acceptor systems.
Materials Advances published new progress about Absorption. 91-15-6 belongs to class nitriles-buliding-blocks, name is Phthalonitrile, and the molecular formula is C8H4N2, Formula: C8H4N2.
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts