Photophysical properties of gold nanoclusters for low-loss luminescent solar concentrators
| Autor: | Yun-Rong Sie, 謝昀融 |
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| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 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. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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