Emergence of intense near-infrared photoluminescence by photoactivation of silver nanoclusters

2021 ◽  
Author(s):  
Wataru Ishii ◽  
Shohei Katao ◽  
Yoshiko Nishikawa ◽  
Yasuo Okajima ◽  
Atsuya Hatori ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Near Infrared ◽  
Silver Nanoclusters ◽  
Pyridine Solution

Photoirradiation to a pyridine solution of Ag29 nanoclusters (NCs) with red photoluminescence (PL) at 680 nm activated intense PL in the near infrared (NIR) region, giving a PL quantum yield...

scholarly journals Unusually large fluorescence quantum yield for a near-infrared emitting DNA-stabilized silver nanocluster

2020 ◽  
Vol 56 (47) ◽  
pp. 6384-6387
Author(s):  
Vlad A. Neacşu ◽  
Cecilia Cerretani ◽  
Mikkel B. Liisberg ◽  
Steven M. Swasey ◽  
Elisabeth G. Gwinn ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Near Infrared ◽  
Infrared Region ◽  
Silver Nanoclusters ◽  
Silver Nanocluster ◽  
Dna Strands ◽  
Near Infrared Region ◽  
High Fluorescence ◽  
High Fluorescence Quantum Yield

Silver nanoclusters stabilized by 5′-CCCGGAGAAG-3′ DNA strands display an unusually high fluorescence quantum yield in the near-infrared region.

Highly Fluorescent Au25-xAgx Nanoclusters Protected with Poly(ethylene glycol) - and Zwitterion-Modified Thiolate Ligands

2018 ◽  
Author(s):  
Dinesh Mishra ◽  
Sisi Wang ◽  
Zhicheng Jin ◽  
Eric Lochner ◽  
Hedi Mattoussi
Keyword(s):  
Quantum Yield ◽  
Near Infrared ◽  
Small Diameter ◽  
Binding Energies ◽  
Thiolate Ligands ◽  
Nir Emission ◽  
Thiolate Complexes ◽  
Long Lifetime ◽  
Poly Ethylene

<p>We describe the growth and characterization of highly fluorescing, near-infrared-emitting nanoclusters made of bimetallic Au<sub>25-x</sub>Ag<sub>x</sub> cores, prepared using various monothiol-appended hydrophobic and hydrophilic ligands. The reaction uses well-defined triphenylphosphine-protected Au<sub>11</sub> clusters (as precursors), which are reacted with Ag(I)-thiolate complexes. The prepared nanoclusters are small (diameter < 2nm, as characterized by TEM) with emission peak at 760 nm and long lifetime (~12 µs). The quantum yield measured for these materials was 0.3 - 0.4 depending on the ligand. XPS measurements show the presence of both metal atoms in the core, with measured binding energies that agree with reported values for nanocluster materials. The NIR emission combined with high quantum yield, small size and ease of surface functionalization afforded by the coating, make these materials suitable to implement investigations that address fundamental questions and potentially useful for biological sensing and imaging applications.<br></p>

scholarly journals Two-Photon–NIR-II Antimicrobial Graphene-Nanoagent for Ultraviolet–NIR Imaging and Photoinactivation

2021 ◽  
Author(s):  
WEN-SHUO KUO ◽  
Chia-Yuan Chang ◽  
Ping-Ching Wu ◽  
Jiu-Yao Wang
Keyword(s):  
Photodynamic Therapy ◽  
Quantum Yield ◽  
Chemical Modification ◽  
Near Infrared ◽  
Photon Absorption ◽  
Excitation Wavelength ◽  
Strong Electron ◽  
Two Photon ◽  
Photon Excitation ◽  
Two Photon Excitation

Abstract BackgroundNitrogen doping and amino-group functionalization, which result in strong electron donation, can be achieved through chemical modification. Large π-conjugated systems of graphene quantum dot (GQD)-based materials acting as electron donors can be chemically manipulated with low two-photon excitation energy in a short photoexcitation time for improving the charge transfer efficiency of sorted nitrogen-doped amino acid–functionalized GQDs (sorted amino-N-GQDs). ResultsIn this study, a self-developed femtosecond Ti-sapphire laser optical system (222.7 nJ pixel−1 with 100-170 scans, approximately 0.65-1.11 s of total effective exposure times; excitation wavelength: 960 nm in the near-infrared II region) was used for chemical modification. The sorted amino-N-GQDs exhibited enhanced two-photon absorption, post-two-photon excitation stability, two-photon excitation cross-section, and two-photon luminescence through the radiative pathway. The lifetime and quantum yield of the sorted amino-N-GQDs decreased and increased, respectively. Furthermore, the sorted amino-N-GQDs exhibited excitation-wavelength-independent photoluminescence in the near-infrared region and generated reactive oxygen species after two-photon excitation. An increase in the size of the sorted amino-N-GQDs boosted photochemical and electrochemical efficacy and resulted in high photoluminescence quantum yield and highly efficient two-photon photodynamic therapy. ConclusionThe sorted dots can be used in two-photon contrast probes for tracking and localizing analytes during two-photon imaging in a biological environment and for conducting two-photon photodynamic therapy for eliminating infectious microbes.

Gold Doping of Silver Nanoclusters: A 26-Fold Enhancement in the Luminescence Quantum Yield

2016 ◽  
Vol 128 (19) ◽  
pp. 5843-5847 ◽  
Author(s):  
Giada Soldan ◽  
Maha A. Aljuhani ◽  
Megalamane S. Bootharaju ◽  
Lina G. AbdulHalim ◽  
Manas R. Parida ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Silver Nanoclusters ◽  
Luminescence Quantum Yield ◽  
Gold Doping

scholarly journals Evaluation of red and near infrared fluorescent silver nanoclusters as potential in vivo indicators of tight junction opening

RSC Advances ◽  
2017 ◽  
Vol 7 (52) ◽  
pp. 32536-32542 ◽  
Author(s):  
Xinyi Wang ◽  
Na Wang ◽  
Limei Li ◽  
Ruyue Xiao ◽  
Lan Yuan ◽  
...  
Keyword(s):  
Tight Junction ◽  
Near Infrared ◽  
Fluorescence Probe ◽  
Structure Change ◽  
Silver Nanoclusters

A double fluorescence probe strategy based on silver nanoclusters for study of the TJ structure change.

Near-Infrared Fluorescent Probe with High Quantum Yield and Its Application in the Selective Detection of Glutathione in Living Cells and Tissues

2016 ◽  
Vol 88 (19) ◽  
pp. 9746-9752 ◽  
Author(s):  
Jun-Ying Xie ◽  
Chun-Yan Li ◽  
Yong-Fei Li ◽  
Junjie Fei ◽  
Fen Xu ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Fluorescent Probe ◽  
Near Infrared ◽  
Living Cells ◽  
Selective Detection ◽  
High Quantum Yield ◽  
High Quantum

Aqueous Synthesis of MPA-Capped CdTe Nanocrystals Emitted in Near Infrared with High Quantum Yield

2014 ◽  
Vol 14 (7) ◽  
pp. 5238-5243 ◽  
Author(s):  
Yongqiang Cao ◽  
Ning Liu ◽  
Ping Yang ◽  
Yuanna Zhu ◽  
Ruixia Shi ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Near Infrared ◽  
High Quantum Yield ◽  
Aqueous Synthesis ◽  
High Quantum ◽  
Cdte Nanocrystals

Gold Doping of Silver Nanoclusters: A 26-Fold Enhancement in the Luminescence Quantum Yield

2016 ◽  
Vol 55 (19) ◽  
pp. 5749-5753 ◽  
Author(s):  
Giada Soldan ◽  
Maha A. Aljuhani ◽  
Megalamane S. Bootharaju ◽  
Lina G. AbdulHalim ◽  
Manas R. Parida ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Silver Nanoclusters ◽  
Luminescence Quantum Yield ◽  
Gold Doping

Energy Transfer Dynamics and Quantum Yield Derivation of the Tm3+ Concentration-Dependent, Three-Photon Near-Infrared Quantum Cutting in La2BaZnO5

2015 ◽  
Vol 119 (47) ◽  
pp. 26643-26651 ◽  
Author(s):  
Ting Yu ◽  
Huihong Lin ◽  
Dechao Yu ◽  
Shi Ye ◽  
Qinyuan Zhang
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Near Infrared ◽  
Quantum Cutting

High-Quantum-Yield Mitochondria-Targeting Near-Infrared Fluorescent Probe for Imaging Native Hypobromous Acid in Living Cells and in Vivo

2017 ◽  
Vol 89 (3) ◽  
pp. 1787-1792 ◽  
Author(s):  
Xiaojun Liu ◽  
Aishan Zheng ◽  
Dongrui Luan ◽  
Xiaoting Wang ◽  
Fanpeng Kong ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Fluorescent Probe ◽  
Near Infrared ◽  
Living Cells ◽  
High Quantum Yield ◽  
High Quantum ◽  
Hypobromous Acid ◽  
Mitochondria Targeting
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