折射率对碳点基发光太阳能聚光器光电性能的影响  

Effect of Refractive Index on Photoelectric Properties of Carbon Dots-based Luminescent Solar Concentrator

作　　者：白静静 许凤利 李鹏炬 李歆 徐文军 翟燕 BAI Jingjing;XU Fengli;LI Pengju;LI Xin;XU Wenjun;ZHAI Yan(Department of Materials Engineering,Taiyuan Institute of Technology,Taiyuan 030008,China;Shanxi Center of Technology Innovation for Light Manipulations and Applications,School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China;Shanxi Quantum Digital Technology Co.LTD,Taiyuan 030021,China)

机构地区：[1]太原工业学院材料工程系,山西太原030008 [2]太原科技大学应用科学学院,山西省光场调控与融合应用技术创新中心,山西太原030024 [3]山西量界数字科技有限公司,山西太原030021

出　　处：《发光学报》2024年第10期1724-1731,共8页Chinese Journal of Luminescence

基　　金：山西省基础研究计划(202203021212332,202203021211211,202203021212330)。

摘　　要：发光太阳能聚光器作为一种新型的实现低成本电力的潜在光伏技术已经引起了广泛的关注。选择合适的荧光基质和性能优异的光波导介质成为该技术得以推广应用的关键。目前,多数研究者把目光聚焦在荧光基质光学性能的提高上,对光波导介质性能的优化却鲜有报道。本文使用邻苯二甲酸和邻苯二胺两种前驱体,一步微波法快速高效地合成了一种晶态碳点。鉴于该碳点具有绿色荧光,荧光量子产率超过80%,并且吸收和发射光谱间存在较大的斯托克斯位移,适合作为新型太阳能聚光器用荧光基质。另外,采用预聚体法制备了高透明的聚氨酯膜,并作为发光太阳能聚光器用光波导介质研究了其光学性能。通过引入硫元素,该薄膜的折射率从1.483提高到1.547,这直接导致利用所制备的碳点作为荧光基质封装的聚氨酯薄膜型发光太阳能聚光器器件的光电转换效率提升了41%。该结果不仅证实了聚氨酯作为光波导介质的可行性,更为通过改良光波导介质的折射率来提高光传输的研究方法提供了实验依据。Luminescent solar concentrator(LSC),as a new potential solar technology to achieve low cost electricity,has attracted wide attention,and it is the key to popularize the technique to select suitable fluorescent substrate and waveguide medium with excellent optical property.Up to now,most researchers focus on the improvement of optical properties of fluorescent substrates,but there are few reports on the performance optimization of optical waveguide medium.Here,a crystalline carbon dots(CDs)was synthesized by one-step microwave method using two precursors of phthalic acid and phthalenediamine.Since the CDs can emit green fluorescence and has a large Stokes shift between absorption and emission spectra,it is suitable as a fluorescent substrate for a new type of solar concentrator.In addition,highly transparent polyurethane(PU)films were prepared by prepolymer method,and their optical properties were studied as optical waveguide medium for LSC.By introducing sulfur element,the refractive indexes of these films were increased from 1.483 to 1.547,which directly led to a 41%increase in the photoelectric conversion efficiency of the PU film-based LSC device encapsulated with the prepared CDs as the fluorescent matrix.The results not only confirm the feasibility of PU as optical waveguide medium,but also provide experimental basis for the research method of improving optical transmission by increasing the refractive index of optical waveguide medium.

关 键 词：晶态碳点 光波导介质 折射率 发光太阳能聚光器 光电转换效率 

分 类 号：TK513.1[动力工程及工程热物理—热能工程]