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Size‐Dependent Light Harvesting from Nonthermalized Excited States of Gold Clusters
Solar RRL ( IF 6.0 ) Pub Date : 2021-01-20 , DOI: 10.1002/solr.202000710
Kyunglim Pyo 1 , Sang Myeong Han 1 , Hongmei Xu 1 , Sukanya Saha 2 , Guda Ramakrishna 2 , Dongil Lee 1
Affiliation  

Light harvesting is central to many photonic materials. The light harvesting efficiency in these materials is, however, generally reduced because upper excited‐state energy is lost by energy‐dissipating internal conversion (IC) and vibrational relaxation processes. Herein, size‐dependent energy harvesting from nonthermalized, upper excited states of glutathione‐protected gold clusters of various sizes, including Au18, Au22, Au25, Au67, Au102, and Au≈940, is reported. Femtosecond transient absorption measurements reveal that the IC processes of Au18, Au22, and Au25 are relatively slow wherein the upper excited‐state energy of gold clusters efficiently is harvested by an energy acceptor, aminofluorescein (AF), covalently attached to the gold cluster on the time scales of 150 fs (Au18), 220 fs (Au22), and 380 fs (Au25). Steady‐state photoluminescence measurements of AF‐conjugated Au18, Au22, and Au25 clusters show notable AF emission upon high‐energy excitation of gold clusters. Herein, a new avenue for energy harvesting from nonthermalized upper excited states of gold clusters, which would otherwise be lost as heat, is opened up.

中文翻译:

从非热激发态金团簇的大小依赖的光收集。

光收集对于许多光子材料至关重要。但是,这些材料的光收集效率通常会降低,因为较高的激发态能量会因耗能的内部转换(IC)和振动弛豫过程而损失。在本文中,报道了从各种大小的谷胱甘肽保护的金簇的非加热,上激发态得到的尺寸依赖性能量,包括Au 18,Au 22,Au 25,Au 67,Au 102Au≈940。飞秒瞬态吸收测量表明,Au 18,Au 22和Au 25的IC过程相对较慢,其中金簇的上激发态能量由能量受体氨基荧光素(AF)有效地收集,该氨基受体在150 fs(Au 18),220 fs(Au 22)的时间尺度上共价附着于金簇和380 fs(Au 25)。AF共轭的Au 18,Au 22和Au 25团簇的稳态光致发光测量显示,在金团簇的高能激发下,AF发射显着。在此,从金团簇的非热的上激发态收集能量的新途径被打开了,否则将由于热量而损失掉。
更新日期:2021-03-10
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