Excitation-Wavelength-Dependent Dual Emission in Au42 Quantum Rods.
5 affiliations
- 1Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania15213, United States.
- 2Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania16802, United States.
- 3Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York11973, United States.
- 4School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia30332, United States.
- 5Department of Chemistry, Georgia State University, Atlanta, Georgia30302, United States.
Abstract
Dual emissive materials are of particular importance in chemical and biological assays. Herein, we focus on a rod-shaped Au42(SCH2CH2Ph)32 nanocluster that exhibits dual emission at 875 and 1040 nm owing to fluorescence (FL) and phosphorescence (PH), respectively. Transient absorption analysis shows a slow intersystem crossing (ISC, ∼500 ps) from lowest singlet S1 to triplet T1 upon direct S1 excitation, leading to dual emission from both S1 and T1. However, upon excitation of the higher Sn state, we observe a metastable singlet state (S'). We rationalize two competing decay pathways from S': (i) internal conversion to S1 and (ii) ISC to high triplet Tn≥2. These processes alter the populations of the S1 and T1 states, which explains the excitation-wavelength-dependent dual emission and FL/PH ratios. The revealed excited-state mechanism and the dual emissive Au42 material will serve as a paradigm for future research on atomically precise nanoclusters.
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BibTeX
@article{he2026excitationwavelengthdependent,
title = {{Excitation-Wavelength-Dependent Dual Emission in Au42 Quantum Rods.}},
author = {Guiying He and Lianshun Luo and Mircea Cotlet and Guoxiang Hu and Gangli Wang and Rongchao Jin},
journal = {Nano letters},
year = {2026},
month = oct,
doi = {10.1021/acs.nanolett.6c04058},
url = {https://europepmc.org/article/MED/42905091},
note = {CC BY},
}
RIS
TY - JOUR
TI - Excitation-Wavelength-Dependent Dual Emission in Au42 Quantum Rods.
AU - Guiying He
AU - Lianshun Luo
AU - Mircea Cotlet
AU - Guoxiang Hu
AU - Gangli Wang
AU - Rongchao Jin
PY - 2026
DA - 2026/10/01
JO - Nano letters
DO - 10.1021/acs.nanolett.6c04058
UR - https://europepmc.org/article/MED/42905091
AB - Dual emissive materials are of particular importance in chemical and biological assays. Herein, we focus on a rod-shaped Au42(SCH2CH2Ph)32 nanocluster that exhibits dual emission at 875 and 1040 nm owing to fluorescence (FL) and phosphorescence (PH), respectively. Transient absorption analysis shows a slow intersystem crossing (ISC, ∼500 ps) from lowest singlet S1 to triplet T1 upon direct S1 excitation, leading to dual emission from both S1 and T1. However, upon excitation of the higher Sn state, we observe a metastable singlet state (S'). We rationalize two competing decay pathways from S': (i) internal conversion to S1 and (ii) ISC to high triplet Tn≥2. These processes alter the populations of the S1 and T1 states, which explains the excitation-wavelength-dependent dual emission and FL/PH ratios. The revealed excited-state mechanism and the dual emissive Au42 material will serve as a paradigm for future research on atomically precise nanoclusters.
SN - 1530-6984
SN - 1530-6992
ER -