標題: Coordination-induced emission enhancement in gold-nanoclusters with solid-state quantum yields up to 40% for eco-friendly, low-reabsorption nano-phosphors
作者: Huang, Hsiu-Ying
Cai, Kun-Bin
Talite, Maria Jessabel
Chou, Wu-Ching
Chen, Po-Wen
Yuan, Chi-Tsu
電子物理學系
Department of Electrophysics
公開日期: 11-Mar-2019
摘要: Colloidal quantum dots (CQDs) have gained much attention as light-emitting materials for light-conversion nano-phosphors and luminescent solar concentrators. Unfortunately, those CQDs involve toxic heavy metals and frequently need to be synthesized in the hazardous organic solvent. In addition, they suffer from severe solid-state aggregation-induced self-quenching and reabsorption losses. To address these issues, here we prepare Zn-coordinated glutathione-stabilized gold-nanocluster (Zn-GSH-AuNCs) assemblies without involving heavy metals and organic solvent. Unlike GSH-AuNCs dispersed in an aqueous solution with poor photoluminescence quantum yields (PL-QYs, typically similar to 1%), those Zn-GSH-AuNCs powders hold high solid-state PL-QYs up to 40 +/- 5% in the aggregated state. Such Zn-induced coordination-enhanced emission (CEE) is attributed to the combined effects of suppressed non-radiative relaxation and enhanced charge-transfer interaction. In addition, they also exhibit a large Stokes shift, thus mitigating both aggregation-induced self-quenching and reabsorption losses. Motivated by these photophysical properties, we demonstrated white-light emission from all non-toxic, aqueous-synthesis nano-materials.
URI: http://dx.doi.org/10.1038/s41598-019-40706-3
http://hdl.handle.net/11536/148985
ISSN: 2045-2322
DOI: 10.1038/s41598-019-40706-3
期刊: SCIENTIFIC REPORTS
Volume: 9
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