Size-Dependent Light Harvesting from Nonthermalized Excited States of Gold Clusters

Kyunglim Pyo, Sang Myeong Han, Hongmei Xu, Sukanya Saha, Guda Ramakrishna, Dongil Lee

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number2000710
JournalSolar RRL
Volume5
Issue number3
DOIs
Publication statusPublished - 2021 Mar

Bibliographical note

Funding Information:
K.P. and S.M.H. contributed equally to this work. This work was supported by the National Research Foundation of Korea (NRF) grant (NRF‐2017R1A2B3006651) and Korea Electric Power Corporation. (Grant No. R20XO02‐23). G.R. acknowledges the support by Western Michigan University‐FRACAA. K.P. acknowledges the support by Yonsei University Research Fund (Post Doc. Researcher Supporting Program) of 2019 (project no. 2019‐12‐0020). The authors thank Dr. Gary Wiederrecht for his help with transient absorption measurements. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the USA. Department of Energy, Office of science, Office of Basic Energy Sciences, under contract no. DE‐AC02‐06CH11357.

Funding Information:
K.P. and S.M.H. contributed equally to this work. This work was supported by the National Research Foundation of Korea (NRF) grant (NRF-2017R1A2B3006651) and Korea Electric Power Corporation. (Grant No. R20XO02-23). G.R. acknowledges the support by Western Michigan University-FRACAA. K.P. acknowledges the support by Yonsei University Research Fund (Post Doc. Researcher Supporting Program) of 2019 (project no. 2019-12-0020). The authors thank Dr. Gary Wiederrecht for his help with transient absorption measurements. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the USA. Department of Energy, Office of science, Office of Basic Energy Sciences, under contract no. DE-AC02-06CH11357.

Publisher Copyright:
© 2021 Wiley-VCH GmbH

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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