Impact of photodepletion to amplified spontaneous emission of proton-transfer dyes in polymeric matrices |
| |
| Authors: | U Täuber CEM Carvalho RF dos Santos CG Carvalhaes CE Fellows |
| |
| Institution: | 1.Laboratório de Espectroscopia e Laser, Instituto de Física,Universidade Federal Fluminense,Niterói,Brazil;2.Laboratório de Fotoquímica, Instituto de Química,Universidade Federal Fluminense,Niterói,Brazil;3.Institudo de Matemática e Estatística,Universidade do Estado do Rio de Janeiro,Rio de Janeiro,Brazil |
| |
| Abstract: | A six level rate equation system was used to investigate the impact of photodepletion to amplified spontaneous emission (ASE)
of intramolecular proton-transfer (IPT) dyes incorporated into polymeric hosts. The model includes the most important transitions
for the normal and tautomer form of the molecule as well as intersystem crossing and triplet–triplet transitions. The experimentally
observed pulse shape as well as photodepletion phenomena, i.e. a first order exponential decay of the ASE intensity and a
shortening in ASE pulse width, have been simulated successfully. Additionally, the model was used to propose an explanation
of the unexpected high photodepletion of proton-transfer dyes in solids. The results show that the emission cross section
and reabsorption cross section of the tautomer form of the molecule are the most important parameter not only for efficiency
but also for photodepletion. The model was tested by comparison with experimental results of 2-(2’-hydroxyphenyl)benzimidazole
in polymethylmethacrylate (PMMA), polystyrene (PS) and a 1:1 alternating copolymer matrix PS-co-PMMA.
PACS 78.45.th; 42.55.Mv; 42.70.Jk |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
