THESIS
2013
iii leaves, iv-xxiii, 164 pages : illustrations (some color) ; 30 cm
Abstract
The development of aggregation-induced emission (AIE) active material with high
sensitivity, high quantum yield in aggregation state is of critical importance to high-tech
applications as well as elucidation of the underlying mechanism and structure/behaviour
relationships have cast our constant effort since the first discovery of the AIE phenomenon in
2001. Due to its fascinating properties and excellent perspective of the AIE materials in solid
state, we have dedicated my all works towards the development of novel organic AIE
materials and mechanistic understanding of the AIE phenomenon. For the AIE materials are
widely used with the UV lamp as excitation, which is harmful to human being, the protocols
of exciting the AIE material with free of UV light is one of the issue to...[
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The development of aggregation-induced emission (AIE) active material with high
sensitivity, high quantum yield in aggregation state is of critical importance to high-tech
applications as well as elucidation of the underlying mechanism and structure/behaviour
relationships have cast our constant effort since the first discovery of the AIE phenomenon in
2001. Due to its fascinating properties and excellent perspective of the AIE materials in solid
state, we have dedicated my all works towards the development of novel organic AIE
materials and mechanistic understanding of the AIE phenomenon. For the AIE materials are
widely used with the UV lamp as excitation, which is harmful to human being, the protocols
of exciting the AIE material with free of UV light is one of the issue to be solved. Therefore, the main objectives of this thesis are: 1) mechanism study of AIE-active materials; 2) design
and synthesize functional AIE-active materials; 3) develop and explore the electroluminescent
material; 4) UV-free excitation protocols for AIE materials.
The first proposed mechanism of AIE phenomenon is due to the main cause called
restriction of intramolecular rotation (RIR) of the peripheral phenyl rings in the aggregate
state. This hypothesis has been verified by experimental evidence and computational
simulation. However we obtained some molecules is AIE-active those were not predicted with
such properties. Following the phenomenon, the mechanism for AIE phenomenon is firstly
recognized the twisting motion one of the vibration motions can also quench the excited state
by non-radiative decay. The series of molecules with no freedom of rotation can behave AIE
properties upon aggregation.
A new class of dibenzothiophene containing tetraphenylethene (TPE) derivatives are
designed and synthesized. Amino groups, methoxyl groups and methyl groups as electronic
donor are introduced to enhance the electroluminescent (EL) properties. Being fabricated into
the EL device, the high efficiency, low turn-on voltage and excellent brightness is achieved.
With such solid state highly emissive AIE materials, we explored the protocol to imaging the
latent prints of human grease. Within seconds, the fingerprints with even dispersed AIE
powder are served to further digitalization processes.
The AIE luminogens are mainly synthesized within organic family, but a series of copper
(I) containing compound is recrystallized with AIE effect. To avoid the usage of UV
excitation, one of the copper (I) compound exhibits the mechanoluminescence upon the crush,
friction, stress and fracture, the other is emission-shifted after grinding upon UV excitation.
With the chemical reaction energy transferring, a general chemiluminescent protocol for AIE
materials is explored and developed
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