Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 17, 2024
Abstract
Organic
emitters
that
exhibit
room‐temperature
phosphorescence
(RTP)
in
neat
films
have
application
potential
for
optoelectronic
devices,
bio‐imaging,
and
sensing.
Due
to
molecular
vibrations
or
rotations,
the
majority
of
triplet
excitons
recombine
rapidly
via
non‐radiative
processes
purely
organic
emitters,
making
it
challenging
observe
RTP
amorphous
films.
Here,
a
chemical
strategy
enhance
is
reported,
by
utilizing
through‐space
charge‐transfer
(TSCT)
effect
induced
intramolecular
steric
hindrance.
The
donor
acceptor
groups
interact
spatial
orbital
overlaps,
while
motions
are
suppressed
simultaneously.
As
result,
triplets
generated
under
photo‐excitation
stabilized
films,
contributing
even
at
room
temperature.
solvatochromic
on
steady‐state
transient
photoluminescence
reveals
feature
involved
excited
states,
TSCT
further
experimentally
resolved
femtosecond
absorption
spectroscopy.
designed
luminescent
materials
with
pronounced
show
lifetimes
up
≈40
ms,
comparable
rigid
polymer
host.
Photoluminescence
afterglow
longer
than
3
s
observed
Therefore,
demonstrated
hindrance
stabilize
long‐lived
leads
Chemistry - A European Journal,
Journal Year:
2024,
Volume and Issue:
30(22)
Published: Feb. 16, 2024
Abstract
Four
donor‐acceptor
boron
difluoride
complexes
based
on
the
carbazole
electron
donor
and
[1,3,5,2]oxadiazaborinino[3,4‐
a
][1,8]naphthyridine
acceptor
were
designed,
synthesized,
systematically
spectroscopically
investigated
in
solutions,
dye‐doped
polymer
films,
solid
states.
The
dyes
exhibit
an
intense
blue
to
red
solid‐state
emission
with
photoluminescence
quantum
yields
of
up
59
%
pure
dye
samples
86
poly(methyl
methacrylate)
films.
All
show
aggregation‐induced
reversible
mechanofluorochromism.
optical
properties
these
their
state
luminescence
can
be
tuned
by
substitution
pattern,
i.
e.,
substituents
at
naphthyridine
unit.
Exchange
CH
3
‐
for
CF
‐groups
does
not
only
increase
intramolecular
charge
transfer
character,
but
also
provides
crystallization‐induced
enhancement.
Organometallics,
Journal Year:
2024,
Volume and Issue:
43(16), P. 1752 - 1765
Published: April 23, 2024
In
this
study,
the
synthesis,
photophysical
characterization,
and
(photo)biological
assessment
of
functional
rhenium(I)-
platinum(II)-based
complexes
are
presented.
These
compounds
feature
anionic
1,2,4-triazolylpyridine-based
chromophores
neutral
βC-based
monodentate
coligands,
specifically
9H-pyrido[3,4-b]indole
(nHo)
or
9-methyl-9H-pyrido[3,4-b]indole
(MenHo),
which
have
been
chosen
to
promote
their
biological
activity.
The
impact
transition
metal
cations,
coordination
geometries,
substitution
patterns
luminophore
coligands
on
properties
these
was
thoroughly
assessed,
encompassing
photoluminescence
singlet
dioxygen
(1O2)
quantum
yields,
excited
state
lifetimes,
(non)radiative
rate
constants,
across
various
temperatures
phases.
Superior
characteristics
were
attained
by
Pt(II)-based
complexes,
while
effective
capabilities
as
photosensitizers
1O2
observed
for
all
compounds.
Incorporation
into
a
polymeric
matrix
(PMMA)
significantly
enhanced
luminescence
efficiencies
preventing
diffusional
quenching
arising
from
triplet
(3O2).
Furthermore,
comprehensive
(photo)cytotoxicity
study
human
telomerase
reverse
transcriptase
(hTERT)-immortalized
cells
conducted
assess
potential
applications
in
photodynamic
therapy.
summary,
versatile
platform
designing
photofunctional
materials
with
photosensitizing
is
offered
chemical
approach.
Precise
control
attributes
achievable
through
careful
selection
centers,
patterns,
ancillary
ligands.
Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 17, 2024
Abstract
Organic
emitters
that
exhibit
room‐temperature
phosphorescence
(RTP)
in
neat
films
have
application
potential
for
optoelectronic
devices,
bio‐imaging,
and
sensing.
Due
to
molecular
vibrations
or
rotations,
the
majority
of
triplet
excitons
recombine
rapidly
via
non‐radiative
processes
purely
organic
emitters,
making
it
challenging
observe
RTP
amorphous
films.
Here,
a
chemical
strategy
enhance
is
reported,
by
utilizing
through‐space
charge‐transfer
(TSCT)
effect
induced
intramolecular
steric
hindrance.
The
donor
acceptor
groups
interact
spatial
orbital
overlaps,
while
motions
are
suppressed
simultaneously.
As
result,
triplets
generated
under
photo‐excitation
stabilized
films,
contributing
even
at
room
temperature.
solvatochromic
on
steady‐state
transient
photoluminescence
reveals
feature
involved
excited
states,
TSCT
further
experimentally
resolved
femtosecond
absorption
spectroscopy.
designed
luminescent
materials
with
pronounced
show
lifetimes
up
≈40
ms,
comparable
rigid
polymer
host.
Photoluminescence
afterglow
longer
than
3
s
observed
Therefore,
demonstrated
hindrance
stabilize
long‐lived
leads
