Concentration dependent evolution of aggregates formed by chlorinated and non-chlorinated perylene tetracarboxylic acid esters in pure spin-coated films and in a PMMA matrix
PBN-AR
Instytucja
Wydział Matematyki, Fizyki i Informatyki (Uniwersytet Gdański)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Journal of Luminescence
ISSN
0022-2313
EISSN
1872-7883
Wydawca
DOI
URL
Rok publikacji
2019
Numer zeszytu
Strony od-do
132-145
Numer tomu
206
Identyfikator DOI
Liczba arkuszy
0.65
Autorzy
(liczba autorów: 4)
Pozostali autorzy
+ 3
Słowa kluczowe
en
perylene dyes
ultra-thin films
time-resolved emission spectra
fluorescence lifetime
fluorescence quantum yield
organic light emitting diodes
Streszczenia
Język
en
Treść
Molecular organization of non-chlorinated (Pn) and chlorinated (PCln) esters of perylene tetracarboxylic acid with four lateral alkyl chains composed of n carbon atoms (n = 4, 10) in spin-coated films has been studied. The Pn dyes have shown a strong tendency for aggregation in the ground and excited state, which can be limited by long alkyl chains. Fluorescence quantum yield (FQY) of their film does not exceed the value of 0.04 and is far below that of the strongly diluted toluene solution (0.87). Chlorine atoms attached in the bay positions of the PCln dyes caused twisting of the perylene skeleton, which resulted in longer intermolecular distances and weaker interactions between molecules in films. In this way, an aggregation process was reduced and the role of the alkyl chains length as a steric hindrance was suppressed. However, FQY of the PCln films is below 0.24, because of its low value measured for the monomeric form in diluted solution (0.35). Furthermore, the concentration effect of the Pn and PCln dyes dispersed in poly (methyl methacrylate) (PMMA) on types of aggregates formed by them and on FQY value has been studied. FQY of the Pn derivatives increased with the drop of their concentration in PMMA up to the values of 0.59 and 0.69 for the dyes with shorter and longer alkyl chains, respectively. This makes them promising materials for application in organic light emitting diodes. In turn, FQY of the PCln derivatives in PMMA matrix was in the range of 0.17–0.37 and does not change in a regular way with dyes concentration.
Inne
System-identifier
UOGa932554e5e294700a6dc3500772235cc
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