Direct Excitation Energy Transfer as a Technique for in Situ Measurements of Ion-Exchange Processes in Single Polymer Particles

1998 ◽  
Vol 70 (1) ◽  
pp. 105-110 ◽  
Author(s):  
Haeng-Boo Kim ◽  
Satoshi Habuchi ◽  
Masahiko Hayashi ◽  
Noboru Kitamura
Keyword(s):  
Energy Transfer ◽  
Ion Exchange ◽  
Excitation Energy ◽  
Excitation Energy Transfer ◽  
In Situ Measurements ◽  
Polymer Particles ◽  
Direct Excitation ◽  
Exchange Processes

scholarly journals In Situ Measurements of Ion-Exchange Processes in Single Polymer Particles:  Laser Trapping Microspectroscopy and Confocal Fluorescence Microspectroscopy

1996 ◽  
Vol 68 (11) ◽  
pp. 1987-1987 ◽  
Author(s):  
Haeng-Boo Kim ◽  
Masahiko Hayashi ◽  
Kiyoharu Nakatani ◽  
Noboru Kitamura ◽  
Keiji Sasaki ◽  
...  
Keyword(s):  
Ion Exchange ◽  
In Situ Measurements ◽  
Laser Trapping ◽  
Polymer Particles ◽  
Exchange Processes ◽  
Confocal Fluorescence

In Situ Measurements of Ion-Exchange Processes in Single Polymer Particles:  Laser Trapping Microspectroscopy and Confocal Fluorescence Microspectroscopy

1996 ◽  
Vol 68 (3) ◽  
pp. 409-414 ◽  
Author(s):  
Haeng-Boo Kim ◽  
Masahiko Hayashi ◽  
Kiyoharu Nakatani ◽  
Noboru Kitamura ◽  
Keiji Sasaki ◽  
...  
Keyword(s):  
Ion Exchange ◽  
In Situ Measurements ◽  
Laser Trapping ◽  
Polymer Particles ◽  
Exchange Processes ◽  
Confocal Fluorescence

scholarly journals Comparisons of the Efficiency of Excitation Energy Transfer by Singlet and Triplet Excitons in Carbazolyl-Containing Polymers

2018 ◽  
Vol 63 (1) ◽  
pp. 25 ◽  
Author(s):  
Yu. A. Skryshevskii ◽  
O. Yu. Vakhnin
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Composite Films ◽  
Excitation Energy Transfer ◽  
Dipole Interaction ◽  
Oxidation Products ◽  
Luminescence Spectra ◽  
Direct Excitation ◽  
Additional Doping ◽  
Triplet Excitons

Luminescence spectra of poly-N-epoxypropylecarbazole (PEPC), poly-N-epoxypropyle-3,6- dichlorocarbazole (DClPEPC), and poly-N-epoxypropyle-3,6-dibromocarbazole (DBrPEPC) films, both pure and with the bis[2-(2′ -benzothienyl)-pyridinato-N,C3′ ](acetylacetonate) iridium (Btp2Ir(acac)) admixture, polystyrene (PS) films with the Btp2Ir(acac) admixture, and composite films of PEPC with the benzophenone and Btp2Ir(acac) admixtures have been studied. Those polymers are promising for their application in optoelectronic devices. It is found that, in the case of PEPC matrix, the excitation energy is transferred both via singlet excitons (through migration and long-range dipole-dipole interaction) and triplet ones (due to the migration and short-range electron exchange interaction). At the same time, in the films based on phosphorescent DBrPEPC, the energy transfer is only provided by triplet excitons. It is found that the quantum yield of the sensitized phosphorescence for Btp2Ir(acac) molecules in the carbazolyl-containing polymer matrix is lower than that under their direct excitation in the PS matrix. For the PEPC-based composite, this parameter is found to be three and five times higher than that for the DClPEPC and DBrPEPC matrices, respectively. The additional doping of the PEPC-based composite with benzophenone gave rise to the transformation of some singlet excitons into triplet ones and, as a result, to a reduction of the sensitized Btp2Ir(acac) phosphorescence intensity. A conclusion is drawn that, during the migration, some of both singlet and triplet excitons became localized in the tail energy states, and a certain fraction of triplet excitons is trapped by polymer oxidation products.

scholarly journals An Effective Potential for Frenkel Excitons

2020 ◽  
Author(s):  
Bartosz Błasiak ◽  
Wojciech Bartkowiak ◽  
Robert Władysław Góra
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Efficient Method ◽  
Effective Potential ◽  
Excitation Energy Transfer ◽  
Computationally Efficient ◽  
Frenkel Excitons

Excitation energy transfer (EET) is a ubiquitous process in life and materials sciences. Here, a new and computationally efficient method of evaluating the electronic EET couplings between interacting chromophores is...

scholarly journals Excitation Energy Transfer from Rhodamine 6G to Photochromic Fulgide

2014 ◽  
Vol 26 (23) ◽  
pp. 8229-8233
Author(s):  
Rabab Sharaf Jassas ◽  
Samy Abdullah El-Daly ◽  
Abdullah M. Asiri ◽  
Salman A Khan
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Rhodamine 6G ◽  
Excitation Energy Transfer
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