Indranil Bhattacharjee

• PostDoc Position at IMDEA Nanosciencia

Highly efficient persistent (lifetime > 0.1 s) room-temperature phosphorescence (pRTP) chromophores are important for futuristic high-resolution afterglow imaging for state-of-the-art security, analytical, and bioimaging applications. Suppression of the radiationless transition from the lowest triplet excited state (T1) of the chromophores is a cri...

The radiationless transition rate based on intramolecular vibrations from the lowest excited triplet state (T1) at room temperature [knr(RT)] is crucial for triplet energy harvesting in optoelectronics and photonics applications. Although a decrease of knr(RT) of chromophores with strong intermolecular interactions is often proposed, scientific evi...

Persistent room-temperature phosphorescence (pRTP) from aggregated molecular crystalline materials is important for stable high-resolution afterglow imaging. However, an unclear understanding concerning the deactivation mechanism from the lowest triplet excited state (T1) precludes the development of highly efficient pRTP. Here, we report the reaso...

Persistent (lifetime > 100 ms) room‐temperature phosphorescence (p RTP) is important for state‐of‐the‐art security and bioimaging applications. An unclear relationship between chromophores and physical parameters relating to p RTP has prevented obtaining an RTP yield of over 50% and a lifetime over 1 s. Here highly efficient p RTP is reported under...

The influences of naphthyl and/or phenyl rings at the 2,4-positions of the quinolinyl fragments in carbazole-quinoline conjugates are studied. The centric phase of one of the conjugates (β-CQNN) revealed both thermally activated delayed fluorescence (TADF) and room-temperature phosphorescence (RTP), while prompt fluorescence and RTP were observed i...

Achieving red phosphorescence from purely organic system is a challenging feat due to the predominant thermal non-radiative decay pathways of the excited electrons. Here we design single-component charge transfer (CT) complexes based on phenoxazine-quinoline conjugates (PQ1-PQ3), in which the phenoxazine ring is covalently attached to the quinoliny...

Purely organic biluminescent materials are of great interest due to the involvement of both singlet and long-lived triplet emissions, which have been used in bio-imaging and organic light-emitting diodes. We show two molecules 3,4,5,6-tetraphenyloxy-phthlonitrile (POP) and 3,4,5,6-tetrakis-p-tolyloxy-phthalonitrile (TOP), in which POP was found to...

The emergence of single-component organic dual light emitters holds great promise for white light-emitting diodes (WLEDs) and biological detection due to the involvement of broad emission covering visible spectrum. Here we show experimental studies on dual emission of carbazole-quinoline conjugate (CQ) that exhibits both thermally activated delayed...

Achieving synthetic control on light-driven molecular dynamics is essential for designing complex molecule-based devices. Here we design a novel coumarin-imidazole conjugate 1 whose excited state structural dynamics is primarily controlled by a distant intramolecular H-bonding interaction within the backbone. The coumarin conjugate is based on 1,2,...