02527nas a2200253 4500008004100000022001400041245011700055210006900172260000800241300001400249490000800263520162300271653002301894653004201917653003001959653001801989100002402007700002702031700001702058700001702075700003002092700002702122856012402149 2024 eng d a0031-865500aFar-red active unsymmetrical squaraine dyes containing N-arylated indoline donors for dye sensitized solar cells0 aFarred active unsymmetrical squaraine dyes containing Narylated  cJUL a1116-11260 v1003 a

Squaraine dyes possess sharp far-red active transition with high extinction coefficient and form aggregates on TiO2 surface. Aggregation of dyes on TiO2 has been considered as a detrimental factor for DSSC device performance, which can be controlled by appending alkyl groups to the dye structures. Hence by integrating alkylated (alkyl groups with both in-plane and out-of-plane) aryl group with indoline moiety to make it compatible with other electrolytes and for controlling the dye-aggregation, a series of squaraine acceptor-based dyes SQA4-6 have been designed and synthesized. SQA4-6 dyes showed absorption between 642 and 653 nm (lambda max), photophysical and electrochemical studies indicated that the HOMO energy levels of this sets of dyes are well aligned with the potentials of I-/I3-\$\$ {\textbackslashmathrm{I}}_3<\^>{-} \$\$ and [Co(bpy)3]2+/3+ redox shuttles for better dye regeneration process. DSSC device efficiency of 3% has been achieved for SQA5 dye with iodolyte (I-/I3-\$\$ {\textbackslashmathrm{I}}_3<\^>{-} \$\$) electrolyte in the presence of 0.3 mM of chenodeoxycholic acid (CDCA). The IPCE profile of DSSC device fabricated with SQA4-6 dyes indicated the contribution of aggregated structures for the photocurrent generation. Dye-sensitized solar cell (DSSC) device efficiency of 3% (Jsc 5.72 mA cm-2, Voc 662 mV and ff 79%) has been achieved for an unsymmetrical squaraine dye, SQA5 with iodolyte electrolyte and the incident photon to current efficiency (IPCE) profile indicates the contribution of aggregated structures for the photocurrent generation.*image

10aaggregation of dye10aarylation on N-atom of indoline donor10adye-sensitized solar cell10asquaraine dye1 aJadhav, Avinash, P.1 aSingh, Ambarish, Kumar1 aPandya, Rinu1 aVanka, Kumar1 aKrishnamoorthy, Kothandam1 aJayaraj, Nithyanandhan uhttp://library.ncl.res.in/content/far-red-active-unsymmetrical-squaraine-dyes-containing-n-arylated-indoline-donors-dye02520nas a2200217 4500008004100000022001400041245016800055210006900223260000900292300001400301490000700315520171300322100002202035700001502057700002402072700001702096700001702113700002402130700002402154856012402178 2024 eng d a2050-752600aUnravelling polymorphism-driven luminescence in GFP chromophore analogues: insights into the phase transition and morphology-dependent optical waveguide properties0 aUnravelling polymorphismdriven luminescence in GFP chromophore a cJUN  a8368-83790 v123 a

The advent of multi-emission organic solid-state materials in response to external stimuli has sparked the scientific community due to their potential application in developing sophisticated optoelectronic sensors and bioanalytical tools. This article presents green fluorescent protein chromophore (GFPc) analogue-based polymorphs exhibiting significantly different emissions due to various noncovalent interactions in the supramolecular environment and conformational alterations in the crystalline state. In both compounds (A and B), the polymorphs undergo monotropic thermal phase transitions that are characterized by DSC, HSM, and VT-PXRD techniques. The distinct fluorescent emission characteristics of these polymorphs demonstrated morphology-related optical waveguiding features. Specifically, the plate-type Form A1 emitted light with a 2D blue hue, while the needle-type Form A2 emitted light with a yellowish-green colour. Additionally, the impressive waveguiding capabilities of Form B1 were explored in both straight and singly/doubly bending configurations to facilitate fluorescence propagation. Consequently, there is significant interest in developing organic materials based on GFP chromophores, which exhibit low emission in solution but display multi-fluorescent emission in the solid state. These materials are promising for applications such as optoelectronic devices, security tags, live cell imaging, and fluorescent inks. Polymorphs of GFPc analogs A and B display differences in their optical waveguiding properties in 1D and 2D depending on the crystal shapes. Furthermore, Form B1 demonstrates efficient optical waveguiding capabilities even when the crystal is bent.

1 aDabke, Niteen, B.1 aRaut, Yash1 aMali, Bhupendra, P.1 aPandya, Rinu1 aVanka, Kumar1 aManoj, Kochunnoonny1 aGonnade, Rajesh, G. uhttp://library.ncl.res.in/content/unravelling-polymorphism-driven-luminescence-gfp-chromophore-analogues-insights-phase00890nas a2200265 4500008004100000022001400041245011500055210007000170260000900240300001600249490000700265653001500272653001700287653001500304653001500319100002500334700001700359700001900376700002100395700001500416700002000431700002000451700001700471856013600488 2024 eng d a1359-734500aUnravelling the prebiotic origins of the simplest α-ketoacids in cometary ices: a computational investigation0 aUnravelling the prebiotic origins of the simplest αketoacids in  cOCT  a11283-112860 v6010aGLYOXYLATE10aHydrocarbons10aMetabolism10aPrecursors1 aDash, Soumya, Ranjan1 aPandya, Rinu1 aSingh, Geetika1 aSharma, Himanshu1 aDas, Tamal1 aHaldar, Hritwik1 aHotha, Srinivas1 aVanka, Kumar uhttp://library.ncl.res.in/content/unravelling-prebiotic-origins-simplest-%CE%B1-ketoacids-cometary-ices-computational-investigation02454nas a2200241 4500008004100000022001400041245012100055210006900176260000800245300001400253490000700267520164400274100001901918700001801937700001701955700001601972700001701988700001902005700001702024700002002041700002102061856013002082 2025 eng d a2040-336400aInvestigating the visible range photoresponse of an organic single-crystal analogue of the green fluorescent protein0 aInvestigating the visible range photoresponse of an organic sing cAPR a8614-86230 v173 a

The growing demand for lightweight, flexible, semi-transparent and low-cost photodetectors (PDs) in wearable electronics and optical communication systems has prompted studies to investigate organic materials as feasible alternatives to conventional inorganic PDs. However, modern organic PDs often face responsivity, detectivity, and photoresponse speed limitations, particularly in the visible range. Here, we present the photoresponse of an organic single-crystal analogue of the green fluorescent protein (GFP) chromophore photodetector, fabricated on a silicon nitride substrate. A significant increase in photocurrent was detected upon illumination with visible wavelengths (532 nm, 630 nm, and halogen light). A remarkably consistent and repeatable photoresponse was obtained during the ON and OFF illumination cycles. The device showed the dependence of photocurrent on the applied bias voltages. The measured photocurrent, responsivity, detectivity, rise time, decay time, noise equivalent power and external quantum efficiency are studied for different wavelengths. Strikingly, the fabricated device demonstrates excellent performance in the visible region compared to several conventional organic and inorganic PDs. The observed responsivity and detectivity values for the device are 98 mA W-1 and 7.94 x 108 Jones, respectively. Furthermore, the device also exhibits rapid photoresponse dynamics with a rise time of 180 ms and a decay time of 152 ms. The excellent photodetection features indicate that the single crystal GFP could serve as a versatile broadband material for future applications in optoelectronics.

1 aVirole, Vishal1 aDabke, Niteen1 aVerma, Sahil1 aKumar, Ajay1 aPandya, Rinu1 aHusale, Sudhir1 aVanka, Kumar1 aGonnade, Rajesh1 aKanawade, Rajesh uhttp://library.ncl.res.in/content/investigating-visible-range-photoresponse-organic-single-crystal-analogue-green-fluorescent