Ca_3Ga_2Ge_3O_(12):Pr^(3+),Yb^(3+)发光性能及其在染料敏化太阳能电池中的应用  

Luminescent Properties of Ca_3Ga_2Ge_3O_(12):Pr^(3+),Yb^(3+) and Its Application in Dye-Sensitized Solar Cells

作　　者：周佳 戴武斌 黄珂 徐慢[1] 王树林[1] ZHOU Jia;DAI Wubin;HUANG Ke;XU Man;WANG Shulin(School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430205

出　　处：《武汉工程大学学报》2018年第6期632-636,640,共6页Journal of Wuhan Institute of Technology

基　　金：湖北省技术创新专项(2016ACA160);武汉工程大学博士启动基金(16QD28);武汉工程大学第九届研究生教育创新基金(CX2017013)

摘　　要：通过将量子剪裁发光和长余辉发光材料的优点结合起来,本文提出了一种量子剪裁长余辉发光机理,以解决实际应用中量子剪裁需要实时激发源及长余辉发光过程效率较低的缺点。为了验证这一机理,采用固相反应法制备了Ca_3Ga_2Ge_3O_(12):Pr^(3+),Yb^(3+)(CGGPY)荧光粉,并将其应用在染料敏化太阳能电池中以提升光电转化效率。利用X射线分析仪、能量色散X射线分析仪、荧光分光光度计和电化学工作站分别对CGGPY荧光粉的晶体结构、元素成分含量、光学性质及染料敏化太阳能电池(DSSCs)的平带电势、饱和电流密度和光伏参数进行表征。实验结果表明在DSSCs中掺杂CGGPY荧光粉能够将紫外光转换成近红外光,进而增加DSSCs的吸收效率及其光电流。当CGGPY掺杂的质量分数为6%时,DSSCs的光电转换效率达到8.658%,比未掺杂CGGPY的DSSCs提高了约46.7%。这种方法为提高DSSCs的光电转换效率提供了一条有效途径。Combining the advantages of quantum-cutting luminescence(QCL)and long-persistent luminescence (LPL)phosphor,we proposed a mechanism of quantum-cutting and long-persistent luminescence(QCLPL) to solve the problems that QCL process needs the real-time excitation source and the LPL process displays lowefficiency in practical applications. To verify the mechanism,Ca3Ga2Ge3O12:Pr3+,Yb3+(CGGPY)phosphors wereprepared by solid state reaction and applied to dye-sensitized solar cells(DSSCs) with the improvedlight-to-electric conversion efficiency. The crystal structure,elemental content and optical properties of CGGPYphosphors,as well as the flat-band potential,saturated current density and the photovoltaic parameters of DSSCs were characterized by X-ray diffraction,energy-dispersion X-ray analysis,fluorescence spectroscopy andelectrochemical workstation respectively. The experimental results show that doping CGGPY phosphors in DSSCs can convert ultraviolet light into near-infrared light,thereby increasing the absorption efficiency andphotocurrent of DSSCs. When the doping mass fraction of CGGPY is 6% in DSSC,the light-to-electricenergy conversion efficiency of the DSSC reaches 8.658%,increasing by 46.7% compared to the undoped DSSC. This method provides an effective way to improve the light-to-electric conversion efficiency of DSSCs.

关 键 词：量子剪裁 长余辉 发光性能 染料敏化太阳能电池 Ca3Ga2Ge3O12:Pr^3+ Yb^3+ 固相反应 

分 类 号：O482.31[理学—固体物理]