Transient Isoemissive Point Observed in the Temperature-Dependent Fluorescence Decay of J-Aggregates Adsorbed on Silica Gel

1990 ◽  
Vol 19 (10) ◽  
pp. 1785-1788 ◽  
Author(s):  
Klaus Kemnitz ◽  
Keitaro Yoshihara ◽  
Tadaaki Tani
Keyword(s):  
Silica Gel ◽  
Fluorescence Decay ◽  
Temperature Dependent ◽  
J Aggregates

scholarly journals Temperature dependent excited state relaxation of a red emitting DNA-templated silver nanocluster

2017 ◽  
Vol 53 (93) ◽  
pp. 12556-12559 ◽  
Author(s):  
Cecilia Cerretani ◽  
Miguel R. Carro-Temboury ◽  
Stefan Krause ◽  
Sidsel Ammitzbøll Bogh ◽  
Tom Vosch
Keyword(s):  
Excited State ◽  
Decay Time ◽  
Fluorescence Decay ◽  
Silver Nanoclusters ◽  
Temperature Dependent ◽  
Silver Nanocluster ◽  
Fluorescence Decay Time ◽  
Average Fluorescence

The average fluorescence decay time of DNA-stabilized silver nanoclusters is temperature dependent and could find applications in nanothermometry.

Temperature-Dependent Exciton Properties of Two Cylindrical J-Aggregates

2014 ◽  
Vol 118 (42) ◽  
pp. 24325-24334 ◽  
Author(s):  
Katie A. Clark ◽  
Emma L. Krueger ◽  
David A. Vanden Bout
Keyword(s):  
Temperature Dependent ◽  
J Aggregates

scholarly journals Quantum Beats in Transient Spectroscopy of J-Aggregates

1996 ◽  
Vol 16 (3) ◽  
pp. 179-196
Author(s):  
H. Glaeske ◽  
K.-H. Feller ◽  
E. Gaišaukas ◽  
L. Knöll
Keyword(s):  
Transient Absorption ◽  
Temporal Evolution ◽  
Quantum Beat ◽  
Quantum Beats ◽  
Level System ◽  
Temperature Dependent ◽  
Phase Relaxation ◽  
Experimental Conditions ◽  
J Aggregates ◽  
Transient Spectroscopy

Quantum beats in transient absorption of PIC-J-aggregates, modelled by a modified 3-level-system are calculated. Experimental conditions for the possibility of their observation are investigated. The influence of the temperature dependent phase relaxation on the temporal evolution of quantum beat signals is considered.

Temperature Dependent Radiative Lifetime of J-Aggregates

1996 ◽  
Vol 100 (21) ◽  
pp. 8640-8644 ◽  
Author(s):  
Valey F. Kamalov ◽  
Irina A. Struganova ◽  
Keitaro Yoshihara
Keyword(s):  
Radiative Lifetime ◽  
Temperature Dependent ◽  
J Aggregates

scholarly journals Bridging the Gap between H- and J-Aggregates: Classification and Supramolecular Tunability for Excitonic Band Structures in 2-Dimensional Molecular Aggregates

2021 ◽  
Author(s):  
Arundhati Deshmukh ◽  
Niklas Geue ◽  
Nadine Bardbury ◽  
Timothy Atallah ◽  
Chern Chuang ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Quantum Yields ◽  
Molecular Aggregates ◽  
Temperature Dependent ◽  
Excitonic Band ◽  
Spectral Shifts ◽  
Aggregate Properties ◽  
Higher Dimensional ◽  
J Aggregates ◽  
Shortwave Infrared

Molecular aggregates with long-range excitonic couplings have drastically different photophysical properties compared to their monomer counterparts. From Kasha’s model for 1-dimensional systems, positive or negative excitonic couplings lead to blue or red shifted optical spectra with respect to the monomers, labelled H-and J-aggregates respectively. The overall excitonic couplings in higher dimensional systems are much more complicated and cannot be simply classified from their spectral shifts alone. Here, we provide a unified classification for extended 2D aggregates using temperature dependent peak shifts, thermal broadening and quantum yields. We discuss the examples of six 2D aggregates with J-like absorption spectra but quite drastic changes quantum yields and superradiance. We find the origin of the differences is, in fact, a different excitonic band structure where the bright state is lower energy than the monomer but still away from the band edge. We call this an ‘I-aggregate’. Our results provide a description of the complex excitonic behaviors that cannot be explained solely on Kasha’s model. Further, such properties can be tuned with the packing geometries within the aggregates providing supramolecular pathways for controlling them. This will allow for precise optimizations of aggregate properties in their applications across the areas of optoelectronics, photonics, excitonic energy transfer, and shortwave infrared technologies.

scholarly journals Bridging the Gap between H- and J-Aggregates: Classification and Supramolecular Tunability for Excitonic Band Structures in 2-Dimensional Molecular Aggregates

2021 ◽  
Author(s):  
Arundhati Deshmukh ◽  
Niklas Geue ◽  
Nadine Bradbury ◽  
Timothy Atallah ◽  
Chern Chuang ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Quantum Yields ◽  
Molecular Aggregates ◽  
Temperature Dependent ◽  
Excitonic Band ◽  
Spectral Shifts ◽  
Aggregate Properties ◽  
Higher Dimensional ◽  
J Aggregates ◽  
Shortwave Infrared

Molecular aggregates with long-range excitonic couplings have drastically different photophysical properties compared to their monomer counterparts. From Kasha’s model for 1-dimensional systems, positive or negative excitonic couplings lead to blue or red shifted optical spectra with respect to the monomers, labelled H-and J-aggregates respectively. The overall excitonic couplings in higher dimensional systems are much more complicated and cannot be simply classified from their spectral shifts alone. Here, we provide a unified classification for extended 2D aggregates using temperature dependent peak shifts, thermal broadening and quantum yields. We discuss the examples of six 2D aggregates with J-like absorption spectra but quite drastic changes quantum yields and superradiance. We find the origin of the differences is, in fact, a different excitonic band structure where the bright state is lower energy than the monomer but still away from the band edge. We call this an ‘I-aggregate’. Our results provide a description of the complex excitonic behaviors that cannot be explained solely on Kasha’s model. Further, such properties can be tuned with the packing geometries within the aggregates providing supramolecular pathways for controlling them. This will allow for precise optimizations of aggregate properties in their applications across the areas of optoelectronics, photonics, excitonic energy transfer, and shortwave infrared technologies.

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