Enhanced Near-Infrared to Visible Upconversion Nanoparticles of Ho3+-Yb3+-F鈥?/sup> Tri-Doped TiO2 and Its Application in Dye-Sensitized Solar Cells with 37% Impro

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• 作者：Jia Yu ; Yulin Yang ; Ruiqing Fan ; Danqing Liu ; Liguo Wei ; Shuo Chen ; Liang Li ; Bin Yang ; Wenwu Cao
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：August 4, 2014
• 年：2014
• 卷：53
• 期：15
• 页码：8045-8053
• 全文大小：601K
• ISSN：1520-510X

文摘

New near-infrared (NIR)-to-green upconversion nanoparticles of Ho³⁺-Yb³⁺-F^{鈥?/sup> tridoped TiO₂ (UC-F-TiO₂) were designed and fabricated via the hydrosol鈥揾ydrothermal method. Under 980 nm NIR excitation, UC-F-TiO₂ emit strong green upconversion fluorescence with three emission bands at 543, 644, and 751 nm and convert the NIR light in situ to the dye-sensitive visible light that could effectively reduce the distance between upconversion materials and sensitizers; thus, they minimize the loss of the converted light. Our results show that this UC-F-TiO₂ offers excellent opportunities for the other types of solar cells applications, such as organic solar cells, c-Si solar cells, multijunction solar cells, and so on. When integrating the UC-F-TiO₂ into dye-sensitized solar cells (DSSCs), superior total energy conversion efficiency was achieved. Under AM1.5G light, open-circuit voltage reached 0.77 卤 0.01 V, short-circuit current density reached 21.00 卤 0.69 mA cm鈥?, which resulted in an impressive overall energy conversion efficiency of 9.91 卤 0.30%, a 37% enhancement compared to DSSCs with pristine TiO₂ photoanode.}