Stable and Efficient White Photoluminescence from Cesium Lead Halide Perovskite Nanocrystals/ Polyfluorene Organogel Composite by Suppressing of Halide Ion Migration; C. Muthu, J. K. Pious, T. Thankachan, N. Krishna, C. Vijayakumar,* Adv. Opt. Mater.2021, 9, 2100601 (1-6).
Self-Assembled Organic Cations-Assisted Band-Edge Tailoring in Bismuth-Based Perovskites for Enhanced Visible Light Absorption and Photoconductivity; K. Pious, M. G. Basavarajappa, C. Muthu, R. Nishikubo, A. Saeki, S. Chakraborty, A. Takai, M. Takeuchi, C. Vijayakumar,* J. Phys. Chem. Lett.2021, 12, 5758-5764.
MWCNT/Thienothiophene based All-Organic thermoelectric composites:
Enhanced performance by realigning of the Fermi level through doping; Vijitha, N. Raveendran, P. Arjun, T. P. Yuvaraj, C. Vijayakumar,* B. Deb,* Chem. Eng. J.2021, 409, 128294 (1-11).
Resistive Switching in Formamidinium Lead Iodide Perovskite Nanocrystals: A Contradiction to the Bulk Form; C. Muthu, A. N. Resmi, J. K. Pious, G. Dayal, N. Krishna, K. B. Jinesh,* Vijayakumar,* J. Mater. Chem. C2021, 9, 288-293.
Formamidinium Lead Iodide Perovskite Nanocrystal/Squaraine Dye Composite based Visibly Opaque and Near-Infrared Transmitting Material; C. Muthu, J. K. Pious, P. S. Seethal, N. Krishna, Vijayakumar,* Adv. Optical Mater.2020, 8, 2001130 (1-8).
Anisotropic Photoconductivity and Long-Lived Charge Carriers in Bismuth-Based One-Dimensional Perovskite with Type-IIa Band Alignment; J. K. Pious, M. G. Basavarajappa, C. Muthu, N. Krishna, R. Nishikubo, A. Saeki, S. Chakraborty,* Vijayakumar,* J. Phys. Chem. Lett.2020, 11, 6757-6762
Bismuth based zero-dimensional perovskite-like material: Effect of benzylammonium on dielectric confinement and photoconductivity; J. K. Pious, C. Muthu, S. Dani, A. Saeki, Vijayakumar,* Chem. Mater.2020, 32, 2647-2652.
Trifluoromethyl-Directed Supramolecular Self-Assembly of Fullerenes: Synthesis, Characterization and Photovoltaic Applications; S. Thawarkar, P. Nagarjuna, A. Bagui, R. Narayan, J. S. Panicker, Vijayakumar, S. P. Singh*; Chem. Select2020, 5, 1115-1121.
Zero- Dimensional Lead-Free Hybrid Perovskite-like Material with a Quantum-Well Structure; J. K. Pious, Katre,C. Muthu,S. Chakraborty,S. Krishna, C. Vijayakumar,* Chem. Mater.2019, 31, 1941-1945.
Photoinduced photoluminescence enhancement in self-assembled clusters of formamidinium lead bromide perovskite nanocrystals; S. Ghimire, Vijayakumar*, C. Muthu, K.-i. Yuyama, M. Vacha, V. Biju*; Nanoscale2019, 11, 9335-9340.
Protein-assisted supramolecular control over fluorescence resonance energy transfer in aqueous medium; Vijayakumar,* K. K. Kartha, B. Balan, S. Poulose, M. Takeuchi*; J. Phys. Chem. C 2019, 123, 13141-13146.
Preferential face-on and edge-on orientation of thiophene oligomers by rational molecular design; T. Ghosh, S. Nagasawa, N. Raveendran, V. Darshan, A. Saeki, Vijayakumar*; Chem. Asian J.2019, 14, 963-967.
V. V. Malov, T. Ghosh, C. Vijayakumar, M. M. Maslov, K. P. Katin, K. N. N. Unni, A. R. Tameev*; Hole mobility in thieno[3,2-b]thiophene oligomers; Mendaleev Commun.2019, 29, 218-219.
K. C. Naeem, C. Vijayakumar*; Reversible switching of solid-state luminescence by heat-induced interconversion of molecular packing; Mol. Syst. Des. Eng.2018, 3, 142-149.
J. K. Pious, M. L. Lekshmi, C. Muthu, R. B. Rakhi,*; C. Vijayakumar*; Zero-Dimensional Methylammonium Bismuth Iodide-Based Lead Free Perovskite Capacitor; ACS Omega2017, 2, 5798-5802.
K. C. Naeem, K. Neenu, C. Vijayakumar*; Effect of differential self-assembly on mechanochromic luminescence of fluorene-benzothiadiazole-based fluorophores; ACS Omega2017, 2, 9118-9126.
C. Muthu, A. Vijayan, C. Vijayakumar*; CH3NH3PbBr3 Perovskite Nanocrystals as Efficient Light-Harvesting Antenna for Fluorescence Resonance Energy Transfer; Chem. Asian J.2017, 12, 988–995.
T. Ghosh, J. S. Panicker, C. Vijayakumar*; Self-Assembled Organic Materials for Photovoltaic Application; Polymers2017, 9, 112.
C. Vijayakumar,* C. Muthu, A. L. Rogach, R. Kohara, and V. Biju*; Channeling Exciton Migration into Electron Transfer in Formamidinium Lead Bromide Perovskite Nanocrystal/Fullerene Composites; Angew. Chem. Int. Ed.2017, 56, 1214–1218.
Jayanthy S. Panicker, Shinji Nagasawa, Akinori Saeki,* Vijayakumar; Synthesis and Optoelectronic Properties of Thiophene-Based Semiconducting Oligomers; Chem. Select2016, 1, 6872–6879.
Jayanthy S. Panicker, Bijitha Balan*, Suraj Soman*, Vijayakumar; Understanding structure-property correlation of metal free organic dyes using interfacial electron transfer measurements; Solar Energy2016, 139, 547–556.
T. Ghosh, A. Gopal, S. Nagasawa, N. Mohan, A. Saeki,* C. Vijayakumar*; Following the TRMC trail: Optimization of photovoltaic efficiency and structure-property correlation of thiophene oligomers; ACS Appl. Mater. Interfaces2016, 8, 25396-25404.
C. Muthu, S. Agarwal, A. Vijayan, P. Hazra, K. B. Jinesh,* C. Vijayakumar*; Hybrid perovskite nanoparticles for high-performance resistive random access memory devices: Control of operational parameters through chloride doping; Adv. Mater. Interfaces 2016, 3, 1600092.
P. Kumar, C. Muthu, C. Vijayakumar, K. S. Narayan*; Quantum confinement effects in organic lead tribromide perovskite nanoparticles; J. Phys. Chem. C2016, 120, 18333-18339.
B. Vedhanarayanan, V. S. Nair, C. Vijayakumar, A. Ajayaghosh*; Formation of coaxial nanocables with amplified supramolecular Chirality through an interaction between carbon nanotubes and a chiral pi-gelator; Angew. Chem. Int. Ed.2016, 55, 10345–10349.
J. S. Panicker, B. Balan,* S. Soman,* T. Ghosh, C. Vijayakumar; Thiophene-bithiazole based metal-free dye as DSSC sensitizer: Effect of co-adsorbents on photovoltaic efficiency; J. Chem. Sci.2016, 128, 101-110.
K. C. Naeem, A. Subhakumari, S. Varughese, C. Vijayakumar*; Heteroatom induced contrasting effects on the stimuli responsive properties of anthracene based donor–pi–acceptor fluorophores; J. Mater. Chem. C2015, 3, 10225-10231.
T. Ghosh, A. Gopal, A. Saeki,* S. Seki, C. Vijayakumar*; p/n-Polarity of thiophene oligomers in photovoltaic cells: role of molecular vs. supramolecular properties; Phys. Chem. Chem. Phys.2015, 17, 10630-10639.
S. Prasanthkumar, S. Ghosh, C. Vijayakumar, A. Saeki, S. Seki, A. Ajayaghosh*; Organic donor–acceptor assemblies form coaxial p–n heterojunctions with high photoconductivity; Angew. Chem. Int. Ed.2015, 54, 946–950.
C. Muthu, S. R. Nagamma, C. Vijayakumar*; Luminescent hybrid perovskite nanoparticles as a new platform for selective detection of 2,4,6-trinitrophenol; RSC Adv. 2014, 4, 55908–55911.
K. K. Kartha, A. Sandeep, C. Vijayakumar, M. Takeuchi,* A. Ajayaghosh*; A carbazole–fluorene molecular hybrid for quantitative detection of TNT using a combined fluorescence and quartz crystal microbalance method; Phys. Chem. Chem. Phys.2014, 16, 18896–18901.
M. Tsuji, A. Saeki,* Y. Koizumi, N. Matsuyama, C. Vijayakumar, S. Seki*; Benzobisthiazole as weak donor for improved photovoltaic performance: Microwave conductivity technique assisted molecular engineering; Adv. Funct. Mater. 2014, 24, 28–36.
B. Balan, C. Vijayakumar, A. Saeki,* Y. Koizumi, M. Tsujia, S. Seki*; Optical and electrical properties of dithienothiophene based conjugated polymers: medium donor vs. weak, medium, and strong acceptors; Polym. Chem.2013, 4, 2293–2303.
Y. Koizumi,* M. Ide, A. Saeki, C. Vijayakumar, B. Balan, M. Kawamoto, S. Seki*; Thienoisoindigo-based low-band gap polymers for organic electronic devices; Polym. Chem. 2013, 4, 484–494.
A. Saeki,* S. Yoshikawa, M. Tsuji, Y. Koizumi, M. Ide, C. Vijayakumar, S. Seki; A versatile approach to organic photovoltaics evaluation using white light pulse and microwave conductivity; J. Am. Chem. Soc.2012, 134, 19035–19042.
C. Vijayakumar, B. Balan, A. Saeki,* T. Tsuda, S. Kuwabata, S. Seki*; Gold nanoparticle assisted self-assembly and enhancement of charge carrier mobilities of a conjugated polymer; J. Phys. Chem. C2012, 116, 17343–17350.
C. Vijayakumar, A. Saeki,* S. Seki*; Optoelectronic properties of dicyanofluorene based n-type polymers; Chem. Asian J. 2012, 7, 1845–1852.
B. Balan, C. Vijayakumar, M. Tsuji, A. Saeki,* S. Seki*; Detection and distinction of DNT and TNT with a fluorescent conjugated polymer using microwave conductivity technique; J. Phys. Chem. B2012, 116, 10371-10378.
B. Balan, C. Vijayakumar, A. Saeki,* Y. Koizumi, S. Seki*; p/n Switching of ambipolar bithiazole-benzothiadiazole-based polymers in photovoltaic cells; Macromolecules2012, 45, 2709–2719.
S. Seki,* A. Saeki, W. Choi, Y. Maeyoshi, M. Omichi, A. Asano, K. Enomoto, C. Vijayakumar, M. Sugimoto, S. Tsukuda, S.-i. Tanaka; Semiconducting cross-linked polymer nanowires prepared by high- energy single-particle track reactions; J. Phys. Chem. B2012, 116, 12857-12863.
B. Balan, C. Vijayakumar, S. Ogi, M. Takeuchi*; Oligofluorene-based nanoparticles in aqueous medium: Hydrogen bond assisted modulation of functional properties and color tunable FRET emission; J. Mater. Chem. 2012, 22, 11224–11234.
C. Vijayakumar, B. Balan, M.-J. Kim, M. Takeuchi*; No-covalent functionalization of SWNTs with azobenzene-containing polymers: Solubility, stability and enhancement of photoresponsive properties; J. Phys. Chem. C 2011, 115, 4533–4539.
C. Vijayakumar, V. K. Praveen, K. K. Kartha, A. Ajayaghosh*; Excitation energy migration in oligo(p-phenylenevinylene) based organogels: structure-property relationship and FRET efficiency; Phys. Chem. Chem. Phys.2011, 13, 4942–4949.
C. Vijayakumar, K. Sugiyasu, M. Takeuchi*; Oligofluorene-based electrophoretic nanoparticles in aqueous medium as a donor scaffold for fluorescence resonance energy transfer and white light emission; Chem. Sci.2011, 2, 291–294.
C. Vijayakumar, G. Tobin, W. Schmitt, M.-J. Kim, M. Takeuchi*; Detection of explosive vapors with a charge transfer molecule: Self-assembly assisted morphology tuning and enhancement in sensing efficiency; Chem. Commun.2010, 46, 874–876.
C. Vijayakumar, V. K. Praveen, A. Ajayaghosh*; RGB emission through controlled donor self-assembly and modulation of excitation energy transfer: A novel approach to white light emitting organogels; Adv. Mater.2009, 21, 2059–2063.
V. K. Praveen, S. S. Babu, C. Vijayakumar, R. Varghese, A. Ajayaghosh*; Helical supramolecular architectures of self-assembled linear pi-systems; Bull. Chem. Soc. Jpn.2008, 81, 1196–1211.
A. Ajayaghosh,* V. K. Praveen, C. Vijayakumar; Organogels as scaffolds for excitation energy transfer and light harvesting; Chem. Soc. Rev.2008, 37, 109–122.
A. Ajayaghosh,* V. K. Praveen, C. Vijayakumar, S. J. Goerge; Molecular wire encapsulated into pi-organogels: efficient supramolecular light harvesting antennae with color-tunable emission; Angew. Chem. Int. Ed.2007, 46, 6260–6265.
V. K. Praveen, S. J. George, R. Varghese, C. Vijayakumar, A. Ajayaghosh*; Self-assembled pi-nanotapes as donor scaffolds for selective and thermally gated fluorescence resonance energy transfer (FRET); J. Am. Chem. Soc.2006, 128, 7542-7550.
A. Ajayaghosh,* C. Vijayakumar, V. K. Praveen, S. S. Babu, R. Varghese; Self-location of acceptors as “isolated” or “stacked” energy traps in a supramole-cular donor self-assembly: A strategy to wavelength tunable FRET emission; J. Am. Chem. Soc.2006, 128, 7174-7175.
A. Ajayaghosh,* R. Varghese, S. J. George, C. Vijayakumar; Transcription and amplification of molecular chirality to oppositely biased supramolecular pi-helices; Angew. Chem. Int. Ed.2006, 45, 1141-1144. (VIP article with front cover page)
Ajayaghosh,* Vijayakumar, R. Varghese, S. J. George; Cholesterol-aided supramolecular control over chromophore packing: Twisted and coiled helices with distinct optical, chiroptical and morphological features; Angew. Chem. Int. Ed.2006, 45, 456-460. (VIP article)
A. Ajayaghosh, C. Sandeep, C. Vijayakumar; A thermoresponsive self-assembled organic material as photonic ink and a process of making thereof; Filed (0157NF2019; Application No. 202011038507; Date of Filing: 05 September 2020).
B. Ded, C. Vijayakumar, I. Vijitha, M. R. Meshram, J.Singh, T. P. Yuvaraj; Thermoelectric material and process for the preparation thereof; Filed (0068NF2018; Appl. No.: 201811035273; US Patent App. 16/979019).
A. Ajayaghosh, C. Vijayakumar, V. K. Praveen White light emitting organogel and process thereof IN200702749-I1; US2010283006-A1; WO2009084006-A1.
Process/product know-how for the making of invisible fluorescent dyes and pigments