This study aims at giving a prologue to the nontracking, concentrating solar waveguides called luminescent solar concentrators. It deliberates the major factors of loss in such systems that limit photon collection and conversion efficiency. Identifying fluorescent molecules possessing a larger Stokes shift value with a broad degree of absorption in the UV-Vis continuum, with sharper and narrower near infra-red emission spectra at a higher quantum yield that achieves a perpetual total internal reflection, remains a challenge now. Geometrical and material properties also play a strategic role in accomplishing waveguides, with minimal loss, through total internal reflection of trapped photons for photovoltaic conversion.
Main problem now a day is ozone layer depletion is a consequence of using conventional energy sources in the world.In the coming years the development of PV systems is the best choice for energy generation. To abstract the energy effectively from the solar, the PV system is to be inclined depending on the sun angle. The angle of sun depends on day time and season. The structure of the PV system is to be designed so that it has two dimensional movements. The angle of the sun is sensed using LDR sensor by sending the info flag to the controller. The controller sends the signal to the motor to change the direction of the structure. The proposed work deals with the design of the system for the dual axis rotation depending on the sun inclination. The use of this solar tracking system is beneficial for more energy generation and cost effective.
Abstract. Spectrofluorometric methods are developed to understand the spectral transitions of a fluorophore and to investigate the photon in-out efficiency of the molecule. In the present work, the preferential solvation of yellow acridine dye has been investigated from the optical, IR absorption and fluorescence emission spectra of the molecule in DMSO + Propan-2-ol binary mixture for varying mole fractions of DMSO. The spectral parameters and that were calculated in the ground and excited states of the molecule show non-linearity specifying occurrence of preferential solvation. It has been observed that for mole fractions higher than 0.2, the molecule is preferentially solvated by the more polar solvent with existence of synergism in the DMSO-rich concentration in both the ground and excited states. The IR absorption spectra obtained for concentrations between 0.2 to 0.8, confirms the weakening of the -OH bonds due to self-associated PrOH molecules at these ratios. It has also been found that in the excited state, non-specific interactions dominate, due to the high dielectric constant of DMSO through dielectric enrichment between the excited dye molecule and the solvent. To summarize, in a given chemical environment of a polar protic and aprotic solvent mixture, acridine molecule tends to stay in the solvation sphere of the more polar aprotic solvent, DMSO.
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