Study On Preparation Of Fluorescent Solar Concentrator By Big Stokes Fluorescent Material

Luminescent solar concentrator（LSC）is solar a collector of sunlight containing a highly emitting fluorescent materials embedded or coated in transparent or translucent optical waveguide media that can gather large areas of sunlight to their edges.Fluorescent material absorbs photons from the LSC surface reissueated at longer wavelengths,re-emissions through full-internal reflections to the edge,collected by solar cells to convert light energy into electrical energy.Ideally,fluorescent materials suitable for high-efficiency LSC should have the characteristics of wide absorption spectrum,high fluorescence quantum yield,small self-absorption,and not easy fluorescence quenching.Therefore,it is important to explore fluorescent materials with large Stokes displacement to improve the optical performance of LSC.The main work of this paper is to prepare the concentrated induced luminescence（AIE）material TPFE-Rho fluorescent nanoparticles with excellent optical performance and large Stokes displacement.The fluorescent nanoparticle has a Stokes displacement of 127 nm and has a high fluorescence quantum yield of 34.88%,a fluorescence emission peak at 597 nm,with an average particle size of about 100 nm.The fluorescent material was mixed into the photowaveguide medium polymethyl acrylates,and the concentration was 0.02 wt%,0.04 wt%,0.06 wt%,0.08 wt%and0.10 wt%,thickness of 0.25 cm and 0.50 cm,respectively,and the related properties were made.The results were as follows:In LSC with a thickness of 0.50 cm and a concentration of 0.08 wt%in LSC,the best values of J_sc,V_oc,η_opt,andηvalue can reach9.97 m A/cm²,0.52 V,4.09%and 3.55%respectively.In order to make full use of sun light and improve the photoelectric conversion efficiency of LSC with single layer structure,this limitation can be overcome by designing the LSC of the laminated structure.Therefore,we use a simple hydrothermal method to prepare green non-toxic and optically excellent nitrogen doped carbon quantum dot（N-CDs）.Through performance representation,we get the average particle size of N-CDs at about 4.2 nm,fluorescence emission peak at about 430 nm,and its fluorescence quantum yield of 79.65%,to meet the Requirements of LSC for fluorescent materials.The prepared N-CDs were mixed with the polymer-enjuumagent polyethylene pyretone（PVP）and prepared into N-CDs/PVP composite films with a film thickness of 12.087±0.07μm,12.642±0.03μm,11.923±0.04μm,and with TPFE-Rho/PMMA composite blocks,the growth of the three-pack of Lammerate Structures of 2.5 cm,4.5 cm and 6.5 cm,respectively.In the LSCs of the laminated structure,the value of the first layer of LSCs based on N-CDs increased with length by 1.76%,1.69%and 1.51%,respectively.Similarly,with the increase of length,the second layer of TPFE-Rho has a value of 2.30%,2.20%and 2.04%,respectively,so the overall efficiency of LSCs of the laminated structure is 4.06%,3.89%and 3.55%,respectively,so the conversion efficiency of the LSCs of the laminated structure has been significantly improved compared to the LSC of the single layer structure.