TY  - JOUR
TI  - The Effect of Imide Substituents on the Excited State Properties of Perylene Diimide Derivatives
AB  - Solid state optical properties of fluorescent materials are important for many photonic devices such as organic light
emitting diodes, frequency down-converters or luminescent solar concentrators. Perylene diimides (PDIs) represent one of the
most popular organic semiconductors which find application in such photonic device applications. In this study, photophysical
properties of two dibrominated PDI (DiBrPDIs), one of which contains a branched alkyl chain (2-ethylhexyl, 2-EH) and the
other with an aromatic substituent (diisopropylphenyl, DIA) at the imide positions are comparatively studied. We report their
absorption and photoluminescence, lifetime and photoluminescence quantum yield (PLQY), as well as photoinduced
absorption properties (PIA) examined by fs-transient absorption spectroscopy. Having the same π conjugated system, DiBrPDIDIA and DiBrPDI-2EH exhibited identical absorption and photoluminescence (PL) spectra in chloroform (λabs:527 nm and
λPL:552 nm). However, in film phase, DiBrPDI-DIA (λPL-DIA:596 nm; PLQY:73.4%) presented a shorter PL wavelength with
a higher PLQY than that of DiBrPDI-2EH (λPL-2EH:649 nm; PLQY:36.7%). Bond lengths and core bending angles of PDI
derivatives were calculated using Chem3D pro software. It was determined that the 2,6-diisopropylphenyl group in
DiBrPDI(DIA) extends a distance of about 6.8 Å out from the imide positions, providing more effective steric protection from
aggregation than the smaller 2EH group.
AU  - AKSOY, ERKAN
AU  - LI, CHUNYONG
AU  - Monkman, Andrew
AU  - Danos, Andrew
AU  - Varlikli, Canan
DO  - 10.55525/tjst.952823
PY  - 2022
JO  - Turkish Journal of Science & Technology
VL  - 17
IS  - 1
SN  - 1308-9099
SP  - 11
EP  - 21
DB  - TRDizin
UR  - http://search/yayin/detay/509937
ER  -