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Doctoral Thesis
Author of thesis: Ing. Rastislav Smolka
Acad. year: 2025/2026
Supervisor: prof. Mgr. Martin Vala, Ph.D.
Reviewers: doc. Mgr. Petr Táborský, Ph.D., Prof. Petar Todorov, Ph.D.
This Ph.D. thesis investigates novel organic photoluminescent materials and examines how molecular structure, intermolecular interactions, and environmental factors influence their optical properties. The work focuses on π-conjugated systems with tuneable emission, excited-state switching, and solid‑state fluorescence, mainly on far-red (FR) and near-infrared (NIR) emitting materials relevant for optoelectronics and bioimaging applications. Conducted research explores how intramolecular rotation, hydrogen bonding, aggregation, protonation, metal coordination, and crystal packing influence radiative and non‑radiative processes. Several classes of organic fluorescent materials were investigated, such as stimuli-responsive hydroxyphtalimides, phthalimide boron difluoride Schiff base complexes, polycyclic hydroxybenzimidazoles, azo‑phthalimide photoswitches, and push-pull substituted stilbenes. The theoretical background is supported by experimental results obtained by steady‑state and time‑resolved emission spectroscopy, NMR spectroscopy, and dynamic light scattering measurements. The presented studies reveal control over excited-state intramolecular proton transfer (ESIPT) and aggregation-induced emission (AIE) processes through restriction of molecular motion, investigate solvatochromic and mechanochromic behaviour, and show how studied materials exhibit environmental sensitivity. Finally, the work investigates visible‑light‑responsive materials with enhanced Z‑isomer stability and explore colour‑tuneable solid‑state fluorescence in crystalline stilbenes in relation to crystal packing and exciton localization. The work also explores a host-guest strategy for preparing water‑dispersible binary‑dye nanoparticles with intense FR and NIR emission, efficient energy transfer, and fluorescence brightness suitable for bioimaging applications. The Selected publications chapter summarizes five peer‑reviewed publications and one manuscript, pointing out the author’s contribution to the development of functional organic luminophores. These publications are an integral part of the thesis and are included in the Appendix chapter. In summary, this thesis expands the understanding of photophysical mechanisms in organic conjugated systems and demonstrates design principles for creating colour‑tuneable and functional luminescent materials.
Organic dyes, fluorescence, phthalimide, stilbene, charge transfer, molecular rotation, solid-state emission, aggregation-induced emission (AIE), ESIPT (proton transfer), colour switching, host-guest systems, mechanochromism, solvatochromism
Date of defence
29.06.2026
Date of publish
28.06.2029
Result of the defence
Defended (thesis was successfully defended)
Process of defence
Předseda komise představil doktoranda a předal mu slovo. Ing. Smolka absolvoval zahraniční stáž na univerzitě v Sofii. Zúčastnil se několika konferencí v České republice a v zahraničí. Je spoluautorem několika článků v impaktovaných časopisech, v jednom případě je uveden jako první autor. Obhajoba proběhla v angličtině. Jeden z oponentů prof. Todorov byl připojen online.
Language of thesis
English
Faculty
Fakulta chemická
Department
Institute of Physical and Applied Chemistry
Study programme
Physical Chemistry (DPCP_FCH_N)
Composition of Committee
prof. Ing. Jozef Krajčovič, Ph.D. (předseda) prof. Ing. Martin Weiter, Ph.D. (člen) doc. Ing. Petr Dzik, Ph.D. (člen) doc. RNDr. Tomáš Slanina, PhD (člen) prof. Mgr. Dominik Heger, PhD. (člen) doc. Mgr. Petr Táborský, Ph.D. (člen) Prof. Petar Todorov, Ph.D. (člen)
Supervisor’s reportprof. Mgr. Martin Vala, Ph.D.
Reviewer’s reportdoc. Mgr. Petr Táborský, Ph.D.
Reviewer’s reportProf. Petar Todorov, Ph.D.
Reasons for publication postponement
Publication of the final thesis has been postponed in compliance with the provisions of Section 47b (4) of Act No. 111/1998 Coll., on the Higher Education Institutions and on amendments and supplements to other acts, as amended.
The submitted dissertation thesis contains novel and significant findings in the given scientific field that have not yet been published. Their disclosure within the dissertation thesis could jeopardize the possibility of publishing these results in high-quality scientific journals.
Responsibility: Mgr. et Mgr. Hana Odstrčilová