Anomalous Surfactant-Induced Enhancement of Luminescence Quantum Yield of Cyanine Dye J-Aggregates

2008 ◽  
Vol 112 (38) ◽  
pp. 14762-14768 ◽  
Author(s):  
Gleb Ya. Guralchuk ◽  
Ivan K. Katrunov ◽  
Roman S. Grynyov ◽  
Alexander V. Sorokin ◽  
Svetlana L. Yefimova ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Cyanine Dye ◽  
Luminescence Quantum Yield ◽  
J Aggregates

scholarly journals Designing Highly Luminescent Molecular Aggregates via Bottom-Up Nanoscale Engineering

2021 ◽  
Author(s):  
Ulugbek Barotov ◽  
Megan Klein ◽  
Lili Wang ◽  
Moungi Bawendi
Keyword(s):  
Quantum Yield ◽  
Long Range ◽  
High Speed ◽  
Cyanine Dye ◽  
High Quantum Yield ◽  
Temperature Dependent ◽  
Bottom Up ◽  
Organic Fluorophores ◽  
High Quantum ◽  
J Aggregates

Coupling of excitations between organic fluorophores in J-aggregates leads to coherent delocalization of excitons across multiple molecules, resulting in materials with high extinction coefficients, long-range exciton transport, and, in particular, short radiative lifetimes. Despite these favorable optical properties, uses of J-aggregates as high-speed light sources have been hindered by their low photoluminescence quantum yields. Here, we take a bottom-up approach to design a novel J-aggregate system with a large extinction coefficient, a high quantum yield and a short lifetime. To achieve this goal, we first select a J-aggregating cyanine chromophore and reduce its nonradiative pathways by rigidifying the backbone of the cyanine dye. The resulting conformationally-restrained cyanine dye exhibits strong absorbance at 530 nm and fluorescence at 550 nm with 90% quantum yield and 2.3 ns lifetime. We develop optimal conditions for the self-assembly of highly emissive J-aggregates. Cryogenic transmission electron microscopy (cryo-TEM) and dynamic light scattering (DLS) reveal micron-scale extended structures with 2D sheet-like morphology, indicating long-range structural order. These novel J-aggregates have a strong red-shifted absorption at 600 nm, resonant fluorescence with no Stokes shift, 50% quantum yield, and 220 ps lifetime at room temperature. We further stabilize these aggregates in a glassy sugar matrix and study their excitonic behavior using temperature-dependent absorption and fluorescence spectroscopy. These temperature- dependent studies confirm J-type excitonic coupling and superradiance. Our results have implications for the development of a new generation of organic fluorophores that combine high speed, high quantum yield and solution processing.

scholarly journals Exploiting cyanine dye J-aggregates/monomer equilibrium in hydrophobic protein pockets for efficient multi-step phototherapy: An innovative concept for smart nanotheranostics

Nanoscale ◽  
2021 ◽  
Author(s):  
Matias Luis Picchio ◽  
Julian Bergueiro Álvarez ◽  
Stefanie Wedepohl ◽  
Roque J Minari ◽  
Cecilia Ines Alvarez Igarzabal ◽  
...  
Keyword(s):  
Indocyanine Green ◽  
Contrast Agent ◽  
Photothermal Therapy ◽  
Near Infrared ◽  
Cyanine Dye ◽  
Hydrophobic Protein ◽  
Nir Dyes ◽  
Protein Pockets ◽  
J Aggregates ◽  
Innovative Concept

After several decades of development in the field of near-infrared (NIR) dyes for photothermal therapy (PTT), indocyanine green (ICG) still remains the only FDA-approved NIR contrast agent. However, upon NIR...

scholarly journals Enhanced Room‐Temperature Photoluminescence Quantum Yield in Morphology Controlled J‐Aggregates

2021 ◽  
pp. 1903080
Author(s):  
Surendra B. Anantharaman ◽  
Joachim Kohlbrecher ◽  
Gabriele Rainò ◽  
Sergii Yakunin ◽  
Thilo Stöferle ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Room Temperature ◽  
Room Temperature Photoluminescence ◽  
Photoluminescence Quantum Yield ◽  
J Aggregates

Erbium-activated modified silica glasses with high 4I13/2 luminescence quantum yield

2006 ◽  
Vol 28 (11) ◽  
pp. 1325-1328 ◽  
Author(s):  
S.N.B. Bhaktha ◽  
B. Boulard ◽  
S. Chaussedent ◽  
A. Chiappini ◽  
A. Chiasera ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Luminescence Quantum Yield ◽  
Modified Silica ◽  
Silica Glasses

Synthesis of CdS-Capped CdSe Nanocrystals without any Poisonous Materials

2014 ◽  
Vol 981 ◽  
pp. 806-809
Author(s):  
Wu Lei Zhou ◽  
Tuo Cai ◽  
Yun Chen ◽  
Xuan Lin Chen ◽  
Yu Qiu Qu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Yield ◽  
Aqueous Medium ◽  
Laser Irradiation ◽  
Absorption Spectroscopy ◽  
Photoluminescence Spectroscopy ◽  
Luminescence Quantum Yield ◽  
Cdse Nanocrystals ◽  
Core Shell ◽  
Photo Stability

CdS-capped CdSe nanocrystals (NCs) which show high luminescence quantum yield are synthesized without any Poisonous Materials in aqueous solution. The synthesis in an aqueous medium without any poisonous materials is attached importance to. The absorption spectroscopy and photoluminescence spectroscopy are employed to analyze the NCs. It takes 78s that the intensity decreases to the half for bare CdSe NCs, but 442s for CdSe/CdS core/shell NCs. The photo stability of CdSe NCs under 325nm laser irradiation is enhanced greatly after CdS overcoating.

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

Molecular Arrangement in Cyanine Dye J-Aggregates Formed on CeO2 Nanoparticles

2018 ◽  
Vol 122 (36) ◽  
pp. 20996-21003 ◽  
Author(s):  
Svetlana L. Yefimova ◽  
Ganna V. Grygorova ◽  
Vladimir K. Klochkov ◽  
Igor A. Borovoy ◽  
Alexander V. Sorokin ◽  
...  
Keyword(s):  
Ceo2 Nanoparticles ◽  
Cyanine Dye ◽  
Molecular Arrangement ◽  
J Aggregates

Synthesis and luminescence properties of colloidal lanthanide doped YVO4

2001 ◽  
Vol 667 ◽  
Author(s):  
Arnaud Huignard ◽  
Thierry Gacoin ◽  
Frédéric Chaput ◽  
Jean-Pierre Boilot ◽  
Patrick Aschehoug ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Room Temperature ◽  
Sol Gel ◽  
Precursor Solution ◽  
Silica Matrix ◽  
Luminescence Quantum Yield ◽  
Colloidal Solutions ◽  
Silicon Alkoxide ◽  
Crystalline Defects ◽  
Hydroxylated Surface

ABSTRACTAqueous colloidal solutions of well dispersed YVO4:Ln (Ln = Eu, Nd) nanoparticles are synthesized through precipitation reactions at room temperature. In the case of YVO4:Eu, a luminescence quantum yield of 15% is found, which is not as high as in the bulk due to the existence of residual crystalline defects and nonradiative relaxations from the hydroxylated surface. Appropriate hydrothermal annealing and deuteration of the surface allow to rise the yield up to 38%. Incorporation of the nanocrystals into a transparent silica matrix is achieved through preliminary coating of the particles with a functionnalized silicon alkoxide and further dispersion into a sol-gel precursor solution. Such sol-gel materials doped with YVO4:Nd nanocrystals are transparent and exhibit the typical emission at 1.06 μm of the Nd3+ ion.

Unusual Capping Chalcogenide Dependence of the Luminescence Quantum Yield of the Hexarhenium(III) Cyano Complexes [Re6(μ3-E)8(CN)6]4−, E2−= Se2−> S2−> Te2−

1999 ◽  
Vol 28 (10) ◽  
pp. 1121-1122 ◽  
Author(s):  
Takashi Yoshimura ◽  
Shoji Ishizaka ◽  
Yoichi Sasaki ◽  
Haeng-Boo Kim ◽  
Noboru Kitamura ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Luminescence Quantum Yield ◽  
Cyano Complexes
Sign in / Sign up

Export Citation Format

Share Document