Synthesis and Photophysical Properties of Light-Harvesting Gold Nanoclusters Fully Functionalized with Antenna Chromophores

Kyunglim Pyo, Hongmei Xu, Sang Myeong Han, Shivi Saxena, Sook Young Yoon, Gary Wiederrecht, Guda Ramakrishna, Dongil Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The development of efficient light-harvesting systems is important to understand the key aspects of solar-energy conversion processes and to utilize them in various photonic applications. Here, atomically well-defined gold nanoclusters are reported as a new platform to fabricate artificial light-harvesting systems. An efficient amide coupling method is developed to synthesize water-soluble Au22 clusters fully protected with pyrene chromophores by taking advantage of their facile phase-transfer reaction. The synthesized Au22 clusters with densely packed 18 pyrene chromophores (Au22–PyB18) exhibit triple-emission in blue, green, and red wavelength regions arising respectively from pyrene monomer, pyrene excimer, and Au22 emission, producing bright white light emission together. The photoluminescence of Au22 is enhanced by more than tenfold, demonstrating that pyrenes at the periphery efficiently channel the absorbed energy to the luminescent Au22 at the center. A combination of femtosecond transient absorption and anisotropy measurements of Au22–PyB18 explicitly reveals three main decay components of 220 fs, 3.5 ps, and 160 ps that can be assigned to energy migration between pyrenes and energy transfer processes from pyrene monomer and excimer to the central Au22, respectively.

Original languageEnglish
Article number2004836
JournalSmall
Volume17
Issue number27
DOIs
Publication statusPublished - 2021 Jul 8

Bibliographical note

Funding Information:
K.P. and H.X. contributed equally to this work. This research was supported by the National Research Foundation of Korea (NRF) grant (NRF-2017R1A2B3006651) and Carbon-to-X Project (Project No. 2020M3H7A1096344) through the NRF funded by the Ministry of Science and ICT, Republic of Korea. K.P. acknowledges the support by the Yonsei University Research Fund (Post Doc. Researcher Supporting Program) of 2019 (Project No.: 2019-12-0020). G.R. acknowledges the support by the Western Michigan University-FRACAA. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.

Funding Information:
K.P. and H.X. contributed equally to this work. This research was supported by the National Research Foundation of Korea (NRF) grant (NRF‐2017R1A2B3006651) and Carbon‐to‐X Project (Project No. 2020M3H7A1096344) through the NRF funded by the Ministry of Science and ICT, Republic of Korea. K.P. acknowledges the support by the Yonsei University Research Fund (Post Doc. Researcher Supporting Program) of 2019 (Project No.: 2019‐12‐0020). G.R. acknowledges the support by the Western Michigan University‐FRACAA. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. 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

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

Fingerprint

Dive into the research topics of 'Synthesis and Photophysical Properties of Light-Harvesting Gold Nanoclusters Fully Functionalized with Antenna Chromophores'. Together they form a unique fingerprint.

Cite this