Plasmon-Enhanced Triplet鈥揟riplet Annihilation Using Silver Nanoplates
详细信息 查看全文
- 作者：Kianoosh Poorkazem ; Amelia V. Hesketh ; Timothy L. Kelly
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：March 27, 2014
- 年：2014
- 卷：118
- 期：12
- 页码：6398-6404
- 全文大小：329K
- 年卷期：v.118,no.12(March 27, 2014)
- ISSN：1932-7455
文摘
Photon upconversion processes have attracted substantial interest as a means of circumventing the Shockley鈥換ueisser limit for single-junction photovoltaic devices. Despite this promise, the quantum yield of most upconversion processes is very low at the light intensities typical of solar radiation (100 mW/cm2). Additionally, bimolecular upconversion processes that rely on molecular diffusion (e.g., triplet鈥搕riplet annihilation) typically see further reductions in quantum yield when the upconverting chromophores are confined to a solid state or thin film matrix. Here we report a plasmon-based enhancement of the triplet鈥搕riplet annihilation process when silver nanoplates are embedded in poly(methyl methacrylate) thin films containing the upconverting materials palladium(II) octaethylporphyrin and 9,10-diphenylanthracene. The silver nanoplates are synthesized with localized surface plasmon resonance bands tailored to overlap strongly with the Q-band of the porphyrin, leading to enhanced light absorption within the film and higher overall triplet concentrations. Optimization of the silver nanoplate loading leads to a nearly 10-fold increase in the upconverted light intensity compared with control samples containing no silver.