Near-Infrared Quantum Cutting Material Er3+/Yb3+ Doped La2O2S with an External Quantum Yield Higher than 100%

2012 ◽  
Vol 116 (21) ◽  
pp. 11652-11657 ◽  
Author(s):  
Bo Fan ◽  
Christophe Chlique ◽  
Odile Merdrignac-Conanec ◽  
Xianghua Zhang ◽  
Xianping Fan
Keyword(s):  
Quantum Yield ◽  
Near Infrared ◽  
Quantum Cutting ◽  
External Quantum Yield

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>

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 Efficient broadband near-infrared quantum cutting for solar cells

2010 ◽  
Vol 18 (9) ◽  
pp. 9671 ◽  
Author(s):  
Yu Teng ◽  
Jiajia Zhou ◽  
Xiaofeng Liu ◽  
Song Ye ◽  
Jianrong Qiu
Keyword(s):  
Solar Cells ◽  
Near Infrared ◽  
Quantum Cutting

Near-infrared luminescence and quantum cutting mechanism in CaWO4:Nd3+, Yb3+

2013 ◽  
Vol 111 (3) ◽  
pp. 367-371 ◽  
Author(s):  
Jiayue Sun ◽  
Yining Sun ◽  
Chun Cao ◽  
Zhiguo Xia ◽  
Haiyan Du
Keyword(s):  
Near Infrared ◽  
Cutting Mechanism ◽  
Infrared Luminescence ◽  
Quantum Cutting

CaMoO4:x%Yb3+: A Novel Near-Infrared Quantum-Cutting Phosphors via Cooperative Energy Transfer

2011 ◽  
Vol 11 (11) ◽  
pp. 9543-9549 ◽  
Author(s):  
Xueqin Cao ◽  
Li Li ◽  
Xiantao Wei ◽  
Yonghu Chen ◽  
Weiping Zhang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Near Infrared ◽  
Quantum Cutting ◽  
Cooperative Energy

Efficient near-infrared quantum cutting in Tb3+,Yb3+ codoped LuPO4 phosphors

2017 ◽  
Vol 35 (3) ◽  
pp. 235-240 ◽  
Author(s):  
Yu PAN ◽  
Li LI ◽  
Wenxuan CHANG ◽  
Wuyang CHEN ◽  
Chen LI ◽  
...  
Keyword(s):  
Near Infrared ◽  
Quantum Cutting

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.

scholarly journals Влияние висмута на свойства упругонапряженных гетероструктур AlGaInAsP<Bi>/InP

2019 ◽  
Vol 53 (8) ◽  
pp. 1110
Author(s):  
М.Л. Лунина ◽  
Л.С. Лунин ◽  
Д.Л. Алфимова ◽  
А.С. Пащенко ◽  
Э.М. Данилина ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Quantum Yield ◽  
Temperature Gradient ◽  
Indium Phosphide ◽  
Luminescence Properties ◽  
Gradient Field ◽  
Epitaxial Layers ◽  
Structural Perfection ◽  
External Quantum Yield

AbstractThe results of growing elastically stressed AlGaInAsP〈Bi〉 thin epitaxial layers from the liquid phase on indium phosphide substrates in a temperature-gradient field are discussed. The effect of bismuth on the structural perfection, the luminescence properties, and the external quantum yield of AlGaInAsP〈Bi〉/InP heterostructures is investigated.

Sign in / Sign up

Export Citation Format

Share Document