Low power, non-coherent sensitized photon up-conversion: modelling and perspectives
Low power, non-coherent sensitized photon up-conversion: modelling and perspectives
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DOI：
10.1039/c2cp23900k
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发表时间：
2012-01-01
影响因子：
3.3
通讯作者：
Meinardi, Francesco
中科院分区：
文献类型：
--
作者：
Monguzzi, Angelo;Tubino, Riccardo;Meinardi, Francesco
在过去的几年里，多组分系统中的非相干敏化光子上转换（SUC）在低激发功率下实现了从紫外（UV）到近红外（NIR）光谱的各种发色团组合的显着高量子产率。这种有前途的光子能量管理技术确实适用于照明技术的广泛应用，特别是在光伏发电中，能够恢复当前设备丢失的亚带隙光子。本文将全面概括地介绍SUC的光物理特性，分析影响光子转换量子产率的参数，以及定义任何SUC系统最佳工作范围的数量，即阈值和饱和激发强度。将显示这些量如何取决于所涉及的部分的内在光物理性质和SUC固体宿主矩阵。所提出的模型是评估新提出系统的有力工具，并将在SUC产率为0.26 +/- 0.02的优化系统中讨论其可靠性。所得结果将为优化SUC效率及其未来技术应用提供研究指导。
In the last few years, non-coherent sensitized photon up-conversion (SUC) in multi-component systems has been developed to achieve significantly high quantum yields for various chromophore combinations at low excitation powers, spanning from the ultraviolet (UV) to near infrared (NIR) spectrum. This promising photon energy management technique became indeed suitable for wide applications in lighting technology and especially in photovoltaics, being able to recover the sub-bandgap photons lost by current devices. A full and general description of the SUC photophysics will be presented, with the analysis of the parameter affecting the photon conversion quantum yield and the quantities which define the optimal working range of any SUC system, namely the threshold and saturation excitation intensity. It will be shown how these quantities depend on intrinsic photophysical properties of the moieties involved and on the SUC solid host matrix. The model proposed represents a powerful tool for evaluation of a newly proposed system, and its reliability will be discussed in respect to an optimized system with SUC yield of 0.26 +/- 0.02. The results obtained will outline the research guidelines which must be pursued to optimize the SUC efficiency for its perspective technological applications.