Fotofizička karakterizacija kinazolinskih derivata: potencijal za WOLED tehnologiju

master's thesis

• Title (english): Photophisical characterization of quinazoline derivates: potential for WOLED technology
• Author: Anđela Goluža
• Mentor: Iva Džeba (mentor)
• Committee member: Iva Juranović Cindrić (predsjednik povjerenstva)
• Committee member: Željka Soldin (član povjerenstva)
• Committee member: Đani Škalamera (član povjerenstva)
• Committee member: Ivan Nemet (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2024-12-18, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Kinazolinski spojevi specifičnog tipa strukture koja ima elektron-donorski i elektron-privlačeći dio su pogodni za molekulski dizajn ciljanih svojstava. U okviru ovog rada provedena je spektroskopska karakterizacija kinazolinskih derivata u različitim otapalima i krutom stanju. Određivana su fotofizička svojstva spojeva, a posebno se ispitao utjecaj protonacije s obzirom na položaje elektron-donorskih supstituenata u odnosu na elektron deficijentni (akceptorski) kinazolinski kromofor. Stacionarnom fluorimetrijom određeni su relativni i apsolutni kvantni prinosi fluorescencije spojeva u otopinama, odnosno u krutim uzorcima u integracijskoj sferi. Određeno je vrijeme života fluorescencije spojeva metodom vremenski koreliranog brojanja pojedinačnih fotona. Iz emisijskih spektara spojeva određene su kromatične koordinate prema CIE 1931 sustavu boja (fr. Commission Internationale de l'Éclairage). Laserskom pulsnom fotolizom ispitana su dodatna fotofizička svojstva kroz detekciju tranzijenata. Na temelju dobivenih rezultata fotofizičkih svojstava spojeva, predložene su nove molekulske strukture za sintezu, potencijalni emiteri bijele svijetlosti usmjereni za primjenu u uređajima WOLED (eng. White Organic Light-Emitting Diode).

Abstract (english)

Quinazoline compounds with a specific structure that has both electron-donating and electron-accepting parts are suitable for molecular design targeting specific properties. This master thesis features the spectroscopic characterization of quinazoline derivatives in different solvents and in the solid state. The photophysical properties of these compounds were determined, with particular focus on the effect of protonation with respect to the positions of the electron- donating substituents in relation to the electron-deficient (accepting) quinazoline chromophore. Steady-state fluorimetry was used to determine the relative or absolute fluorescence quantum yields of the compounds in solutions or solid samples within an integrating sphere. The fluorescence lifetimes of the compounds were determined using the time-correlated single- photon counting method. The color coordinates were calculated from the emission spectra of the compounds according to the CIE 1931 color system (fr. Commission Internationale de l'Éclairage). Further photophysical properties were investigated by laser flash photolysis technique. Based on the results obtained on the photophysical properties of the compounds, new molecular structures were proposed for synthesis as potential white light emitters for application in WOLED devices (White Organic Light-Emitting Diodes).

• Keywords: kinazolini; kvantni prinos fluorescencije; LPF; TCSPC; WOLED
• Keywords (english): fluorescence; LFP; quantum yield; quinazoline; TCSPC; WOLED
• Language: croatian
• URN:NBN: urn:nbn:hr:217:616032
• Study programme: Title: Graduate university studies in chemistry; specializations in: Graduate university studies in chemistry; Course: Graduate university studies in chemistry; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra kemije (sveučilišni/a magistar/magistra kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2025-12-18
• Created on: 2025-01-09 14:45:38