光谱学与光谱分析, 2015, 35 (2): 315, 网络出版: 2015-02-15
钒酸钇的基质施主合作能量传递导致的镱离子的近红外量子剪裁发光
Near-Infrared Quantum Cutting Downconversion Luminescence of Yb3+ Ion Cooperative Energy Transferred from YVO4 Matrix Donor
近红外量子剪裁 太阳能电池 Yb3+离子 合作能量传递 Near-infrared quantum cutting Solar cell Yb3+ ion YVO4 YVO4 Cooperative energy transfer
摘要
稀土材料的红外和可见量子剪裁对于寻找更好能量效率的发光材料来说都是一个激动人心的发展。发光效率的最大上限值能从100%提高到200%甚至更高。在第一代晶硅太阳能电池与第二代薄膜太阳能电池之后第三代的聚光太阳能电池已成为目前的重点发展方向。现在, 利用稀土材料的近红外量子剪裁发光效应有可能较好的解决太阳光谱与太阳能电池光电响应之间存在的光谱失配的问题, 因此有可能较大幅度的提高太阳能电池的发电效率, 因而具有重要的意义与价值。研究了钒酸钇晶体基质中Yb3+离子的近红外量子剪裁发光现象, 测量了从可见到红外的钒酸钇晶体的发光谱、激发谱与荧光寿命, 测量发现钒酸钇晶体基质能带在约322.0 nm光激发时能导致有效的从钒酸钇晶体基质到Yb3+离子的二级合作能量传递, 进而导致了很强的Yb3+离子的985.5 nm 2F5/2→2F7/2的近红外量子剪裁发光, 同时, 钒酸钇晶体基质的位于430.0 nm的发光强度大幅降低。测量发现: (A) Yb(1.5)∶YVO4晶体的430.0 nm的荧光寿命值为τA=3.785 μs;(B) YVO4晶体的430.0 nm的荧光寿命值为τB=22.72 μs;研究计算发现总的理论量子剪裁效率上限值为η1.5%Yb=183.3%。
Abstract
The present manuscript researches the near infrared quantum cutting luminescence phenomena of Yb3+ ion in YVO4 crystal matrix. The luminescence spectra, excitation spectra and fluorescence lifetimes were measured. It was found that the excitation of YVO4 crystal matrix energy band by 322.0 nm light can result in the effective secondary cooperative energy transfer of Yb3+ ion from the YVO4 crystal matrix. It results in the intense 985.5 nm 2F5/2→2F7/2 near infrared quantum cutting luminescence of Yb3+ ion. Meanwhile, the 430.0 nm luminescence intensity of YVO4 crystal matrix decreases greatly. From the experimental measurements, it was found that the lifetime of 430.0 nm fluorescence of (A) Yb(1.5)∶YVO4 crystal is τA=3.785 s and that of (B) YVO4 crystal is τB=22.72 s. It was found also that the theoretical efficiency up limit of quantum cutting of (A) Yb(1.5)∶YVO4 crystal is aboutη1.5%Yb=183.3%.
陈晓波, 周固, 周永芬, 吴正龙, 郭玉英, 王水锋, 邹秋燕, 庄建, 陈晓端, 李春密, 姚文婷, 程欢利. 钒酸钇的基质施主合作能量传递导致的镱离子的近红外量子剪裁发光[J]. 光谱学与光谱分析, 2015, 35(2): 315. CHEN Xiao-bo, ZHOU Gu, ZHOU Yong-fen, WU Zheng-long, GUO Yu-ying, WANG Shui-feng, ZOU Qiu-yan, ZHUANG Jian, CHEN Xiao-duan, LI Chun-mi, YAO Wen-ting, CHENG Huan-li. Near-Infrared Quantum Cutting Downconversion Luminescence of Yb3+ Ion Cooperative Energy Transferred from YVO4 Matrix Donor[J]. Spectroscopy and Spectral Analysis, 2015, 35(2): 315.