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Effective Upconverter and Light Scattering Dual Function LiYF <sub/>4</sub> :Er <sup>3+</sup> /Yb <sup>3+</sup> Assisted Photoelectrode for High Performance Cosensitized Dye Sensitized Solar Cells
摘要： Conversion of near-infrared (NIR) light photons into visible light has remarkable advantages in dye sensitized solar cells (DSSCs) for their improved performance. This study uncovers the dual function of LiYF4:Er3+/Yb3+ as upconverter (UC) and light scattering material in DSSCs by its incorporation onto the photoelectrode. The LiYF4:Er3+/Yb3+ powders were prepared using a facile hydrothermal process followed by spin deposition of LiYF4:Er3+/Yb3+ suspensions over photoelectrode. The photoelectrode used for this investigation was further cosensitized with N719 and squaraine SPSQ2 dyes. The dual functions of LiYF4:Er3+/Yb3+ material coupled with dye cosensitization treatment produced record power conversion efficiency (PCE) of 10.53% in the fabricated DSSC. The LiYF4:Er3+/Yb3+ enabled the photoelectrode DSSC to exhibit good short-circuit current density (Jsc) of 22.16 mA/cm2, open-circuit voltage (Voc) of 0.66 V, and fill factor (FF) of 0.72. This work is the debut attempt toward the application of a photoelectrode embedded with dual function and cosensitized materials to utilize lower energetic photons through the upconversion mechanism and improve absorption close to red wavelengths (absorption band 630?700 nm) through the dye cosensitization process.
关键词： DSSC,LiYF4:Er3+/Yb3+,squaraine dye,cosensitization,high performing,dual function upconverter
更新于2025-09-23 15:19:57
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Near Infrared Fluorophore-Tagged Chloroquine in Plasmodium falciparum Diagnostic Imaging
摘要： Chloroquine was among the first of several effective drug treatments against malaria until the onset of chloroquine resistance. In light of diminished clinical efficacy of chloroquine as an antimalarial therapeutic, there is potential in efforts to adapt chloroquine for other clinical applications, such as in combination therapies and in diagnostics. In this context, we designed and synthesized a novel asymmetrical squaraine dye coupled with chloroquine (SQR1-CQ). In this study, SQR1-CQ was used to label live Plasmodium falciparum (P. falciparum) parasite cultures of varying sensitivities towards chloroquine. SQR1-CQ positively stained ring, mature trophozoite and schizont stages of both chloroquine–sensitive and chloroquine–resistant P. falciparum strains. In addition, SQR1-CQ exhibited significantly higher fluorescence, when compared to the commercial chloroquine-BODIPY (borondipyrromethene) conjugate CQ-BODIPY. We also achieved successful SQR1-CQ labelling of P. falciparum directly on thin blood smear preparations. Drug efficacy experiments measuring half-maximal inhibitory concentration (IC50) showed lower concentration of effective inhibition against resistant strain K1 by SQR1-CQ compared to conventional chloroquine. Taken together, the versatile and highly fluorescent labelling capability of SQR1-CQ and promising preliminary IC50 findings makes it a great candidate for further development as diagnostic tool with drug efficacy against chloroquine-resistant P. falciparum.
关键词： chloroquine,near infrared,fluorescence,Plasmodium falciparium,squaraine dye,malaria
更新于2025-09-10 09:29:36