Controlling the Fluorescence Properties of Diarylethene-based Photochromic Systems
Doktorsavhandling, 2022

Diarylethene (DAE) photoswitches are one of the most promising families of photochromic molecules because of their outstanding photophysical/photochemical properties. This class of compounds, which can photoisomerize between an open colorless and a closed colored form, has been applied in various fields in this thesis work, spanning one-color fluorescence intensity modulation, all-photonic full-color reproduction, light-induced color changes for molecular logic gates and information processing. Particularly, all systems presented can be all-photonically controlled, which is extremely beneficial as light is a sustainable resource from nature that is non-invasive, clean, and waste free that also allows for remote operation.
The first part of the thesis deals with introducing the light-induced isomerization process of the diarylethene derivatives. Through the isomerization of DAEs, intrinsic one-color “on-off” fluorescent intensity modulation as well as dynamic multicolor changes can be realized in the designed systems. In paper I, the diarylethene derivative Dasy is applied as a fluorescent probe aiming at phase-sensitive (lock-in) detection for high-contrast cell studies using fluorescence microscopy. The rapid switching fluorescence signal of Dasy can be successfully discriminated from strong fluorescence background using amplitude modulated red light. In paper II, a photoswitch cocktail mixture is designed where the color of the system can be tuned dynamically only by light-controlled isomerizations of the two monomer photoswitches.
The second part of the thesis focuses on discussing Förster Resonance Energy Transfer (FRET) based photoswitching systems where the emission is controlled through FRET processes by harnessing the different absorption and emission properties of the open and closed isomers of the DAE derivatives. In paper III, the FRET process can be orthogonally controlled by selective isomerization of two individual DAE acceptors, which results in an all-photonic full color red-green-blue (RGB) emissive system. In paper IV, a photoswitch triad is used as a sequential molecular logic gate where the emission output can be controlled by two mechanisms, both inherent and FRET controlled intensity change.

all-photonic

RGB

intensity modulation

FRET

isomerization

diarylethene

photochromic molecules

color change

molecular logic

KC-salen, Kemigården 4
Opponent: professor Jean-Luc Pozzo, University of Bordeaux, France

Författare

Gaowa Naren

Chalmers, Kemi och kemiteknik, Kemi och biokemi

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The thesis focuses on developing different diarylethene (DAE) based photochromic systems that can be all-optically controlled. Diarylethene is a type of photochromic molecule that can undergo reversible color and structural changes through light irradiation. In addition to the color and the structural changes, many other properties also change upon isomerization. In principle, a good rule is to assume that almost every molecular property is altered upon isomerization. Thanks to those differences between the two isomers, photochromic molecules are intensively studied and applied in various research fields, such as photopharmacology, bioimaging, super‐resolution fluorescence microscopy, and information storage. Moreover, photochromic products such as ophthalmic lenses, security inks, textiles, and cosmetics are also commonly seen in our daily life.

The emission color of the presented systems can be either tuned dynamically or switched between “on” and “off” states. The work has potential to be applied in various areas, such as fluorescence microscopy, molecular logic, multi-color and full color reproduction. In addition, all systems are driven by light, which is a sustainable resource from nature that has not been efficiently applied as an energy input. The all-photonic nature lets the designed systems become non-invasive and waste free, at the same time responding remotely and instantaneously.

Drivkrafter

Hållbar utveckling

Innovation och entreprenörskap

Styrkeområden

Nanovetenskap och nanoteknik (SO 2010-2017, EI 2018-)

Ämneskategorier

Fysik

Kemi

Fundament

Grundläggande vetenskaper

Lärande och undervisning

Pedagogiskt arbete

ISBN

978-91-7905-626-1

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 5092

Utgivare

Chalmers

KC-salen, Kemigården 4

Opponent: professor Jean-Luc Pozzo, University of Bordeaux, France

Mer information

Senast uppdaterat

2022-02-03