Advanced Functional Materials,
Journal Year:
2021,
Volume and Issue:
31(45)
Published: Aug. 8, 2021
Abstract
2D
emissive
crystals
have
attracted
tremendous
research
interests
due
to
their
outstanding
compatibility
with
an
integrated
planar
photonic
system,
which
ideally
meet
the
requirement
for
versatile
device
applications,
such
as
lasers,
light‐emitting
devices,
and
optical
waveguides.
Among
materials,
metal‐organic
complex
are
highly
desirable
because
of
strong
charge‐transfer
interactions
enhanced
absorption
that
benefit
superior
luminescence
efficiency.
Here,
in‐air
sublimation
method
is
adopted
synthesize
Ge‐TCNQ
microplate
(TCNQ,
7,7,8,8‐tetracyanoquinodimethane)
thickness
down
13.4
nm.
Such
ultrathin
exhibit
exciton
binding
energy
40.7
meV
a
decent
photoluminescence
(PL)
quantum
efficiency
5.53%.
The
fitting
slope
excitation
power‐dependent
PL
intensity
displays
transition
from
linear
superlinear
characteristics
reveals
both
trap‐assisted
recombination
free
carrier
present
in
process.
band
structure
examined
by
ultraviolet
photoelectron
spectroscopy
UV–vis
elucidate
physical
mechanism
photo
fluorescence
processes.
further
employed
high‐performance
waveguides
small
loss
coefficient
0.078
dB
µm
−1
.
This
work
opens
new
avenues
using
develop
advanced
optoelectronic
devices.
Aggregate,
Journal Year:
2022,
Volume and Issue:
3(5)
Published: Feb. 11, 2022
Abstract
The
development
and
applications
of
materials
with
efficient
circularly
polarized
luminescence
(CPL)
have
become
an
interdisciplinary
frontier
research
topic.
We
summarize
herein
the
recent
advance
in
CPL‐active
aggregates
based
on
metal‐ligand
coordination
(termed
as
“coordination
aggregates”).
surveyed
are
classified
small‐molecular
metal
complexes,
which
include
monocomponent
assemblies
Pt(II)
complexes
other
binary
helicates,
polymers,
frameworks.
efforts
improving
dissymmetry
factors
quantum
yields
these
use
aggregation
strategy
enhancing
performance
isolated
molecules
discussed.
chiral
organic
light‐emitting
diodes
(OLEDs)
solution‐
or
evaporation‐processed
procedures
surveyed.
In
addition,
uses
lanthanide
CPL‐contrast
imaging
CPL
probes
highlighted.
common
discussion
mechanism
aggregation‐enhanced
CPLs
a
perspective
future
works
finally
given.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(31)
Published: April 16, 2024
The
precise
manipulation
of
supramolecular
polymorphs
has
been
widely
applied
to
control
the
morphologies
and
functions
self-assemblies,
but
is
rarely
utilized
for
fabrication
circularly
polarized
luminescence
(CPL)
materials
with
tailored
properties.
Here,
this
work
reports
that
an
amphiphilic
naphthalene-histidine
compound
(NIHis)
readily
self-assembled
into
distinct
chiral
nanostructures
through
pathway-dependent
polymorphism,
which
shows
opposite
multistimuli
responsive
CPL
signals.
Specifically,
NIHis
display
assembly-induced
from
polymorphic
keto
tautomer,
become
predominant
during
enol-keto
tautomerization
shifting
controlled
by
a
bulk
solvent
effect.
Interestingly,
nanofiber
microbelt
inverted
signals
can
be
prepared
same
monomer
in
exactly
compositions
concentrations
only
changing
temperature.
tunable
performance
solid
microbelts
realized
under
multi
external
physical
or
chemical
stimuli
including
grinding,
acid
fuming,
heating.
In
particular,
emission
color
on-off
switch
based
on
polymorph
reversible
heating-cooling
protocol
developed.
This
brings
new
approach
developing
smart
via
polymorphism
engineering.
Angewandte Chemie International Edition,
Journal Year:
2021,
Volume and Issue:
60(26), P. 14595 - 14600
Published: April 6, 2021
Abstract
A
simple
and
general
method
is
presented
herein
for
the
in
situ
preparations
of
circularly
polarized
luminescence
(CPL)‐active
microcrystals
with
a
large
dissymmetry
factor
g
lum
,
high
fluorescence
quantum
efficiency
(
Φ
FL
),
wide
emission
color
tenability,
well‐ordered
morphology.
The
reactions
pyridine‐containing
achiral
molecules
1
–
7
chiral
camphor
sulfonic
acid
((±)‐CSA)
gave
crystalline
microplates
formed
by
hydrogen
bonding
interactions
between
protonated
pyridinium
units
anions.
information
CSA
are
effectively
transferred
to
afford
full‐color
CPL
from
deep‐blue
red
order
10
−2
up
80
%.
Moreover,
organic
high‐performance
white
=46
%;
|
|=0.025)
achieved
via
light‐harvesting
energy
transfer
blue
yellow
emitters.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
unknown
Published: July 23, 2024
Abstract
Catalytic
enantioselective
preparation
of
alkene
atropisomers
with
multiple
stereogenic
elements
and
discovery
their
applications
have
become
significant
but
challenging
issues
in
the
scientific
community
due
to
unique
structures
this
class
atropisomers.
We
herein
report
first
catalytic
atroposelective
cyclopentenyl[
b
]indoles,
a
new
kind
atropisomers,
point
axial
chirality
via
an
unusual
rearrangement
reaction
3‐indolylmethanols
under
asymmetric
organocatalysis.
Notably,
novel
type
promising
developing
chiral
ligands
or
organocatalysts,
discovering
antitumor
drug
candidates
fluorescence
imaging
materials.
Moreover,
theoretical
calculations
elucidated
possible
mechanism
non‐covalent
interactions
control
enantioselectivity.
This
approach
offers
synthetic
strategy
for
elements,
represents
3‐indolylmethanols,
which
will
advance
chemistry
indole
chemistry.
Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: Dec. 4, 2023
Abstract
Developing
facile
and
efficient
methods
to
obtain
circularly
polarized
luminescence
(CPL)
materials
with
a
large
dissymmetry
factor
(
g
lum
)
fluorescence
quantum
yield
Φ
Y
is
attractive
but
still
challenging.
Herein,
supramolecular
polymerization
of
styrylpyrenes
R
/
S
-PEB)
utilized
attain
this
aim,
which
can
self-assemble
into
helical
nanoribbons.
Benefiting
from
the
dominant
CH-π
interactions
between
chromophores,
solution
-PEB
shows
remarkable
blue-color
CPL
property
:
0.011,
69%).
From
gel,
emission
color
(blue
yellow-green)
handedness
–0.011
+0.005)
are
concurrently
manipulated,
while
corresponding
chirality
maintains
unchanged,
representing
rare
example
color-dependent
materials.
Thanks
confine
effect,
[2
+
2]
cycloaddition
reaction
rate
10.5
times
higher
than
that
monomeric
solution.
In
contrast,
no
occurs
for
gel
assembled
solid
samples.
Our
findings
provide
vision
fabricating
multi-modal
high-performance
CPL-active
materials,
paving
way
development
advanced
photo-responsive
chiral
systems.
