低損耗的金奈米團簇之光物理性質運用於發光太陽能聚光器

Photophysical properties of gold nanoclusters for low-loss luminescent solar concentrators

謝昀融(Yun-Rong Sie)

指導教授 ： 院繼祖

中原大學/理學院/物理研究所/碩士(2019年)

https://doi.org/10.6840/cycu201900349

摘要

發光太陽能聚光器(LSC)由發光體收集太陽光波導至側邊太陽能板所組成。通常LSC中的發光體負載濃度受到嚴格的限制，以減輕Concentration-induced quenching (CIQ)、再吸收損失(Reabsorption losses)、Aggregation-induced scattering(AIS)，本研究論文為了解決上述問題，首先利用金奈米團簇(GSH-AuNCs)有大的Stoke-shift、低再吸收的特性，製成膜時將GSH-AuNCs分散在Polyvinylpyrrolidone (PVP)高分子製備具有不同濃度負載的LSC。在26wt%的高負載濃度下，量子產率PL-QY增強至～25%(水溶液僅有1%)，歸功於有良好的ligand-matrix有效抑制非輻射複合，增強其輻射複合的過程。此外，本研究高濃度(～74wt%)仍維持良好的薄膜均勻性與光學特性，並無AIS效應，同時保有極小再吸收與散射，讓側邊發光效率可維持在～70%、在400nm波長下外部量子產率約15%。

關鍵字

金奈米團簇 ； 高負載濃度 ； 發光太陽能集中器

並列摘要

A Luminescent Solar Concentrator (LSC) consists of a polymeric or glassy optical waveguide doped with highly emissive fluorophores. Following light absorption, LSC luminophores re-emit photons which are then guided to edges of the device, where solar cells are attached. Generally, the loading concentration of luminophores in LSC is strictly limited to reduce concentration-induced quenching (CIQ), reabsorption loss and aggregation-induced scattering (AIS). In order to solve the aforementioned problems, this research study utilized Gold Nanoclusters (GSH-AuNCs). GSH-AuNCs has large Stoke-shift and low reabsorption characteristics. GSH-AuNCs were dispersed in suitable Polyvinylpyrrolidone (PVP) polymer in order to prepare LSC with different concentration loading. Even at a high loading concentration of 26wt%, the quantum yield PL-QY is enhanced up to ~25% (only 1% in the pristine aqueous solution), thanks to the outstanding ligand-matrix effective inhibition of non-radiative recombination which enhanced the process of radiation recombination. In addition, the high concentration (~74wt%) of this research study still maintains good film uniformity and optical properties, without AIS effect, while maintaining minimal reabsorption and scattering. This phenomenon allowed the edge-emission efficiency to be maintained up to ~70% in numerical value. Furthermore, the external quantum yield is about 15% at 400 nm.

並列關鍵字

Gold Nanoclusters ； High-Loading ； Concentration Luminescent Solar Concentrators

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