자료유형  

 학위논문

Control Number  

0017162626

International Standard Book Number  

9798384463849

Dewey Decimal Classification Number  

539

Main Entry-Personal Name  

Ivancevic, Marko R.

Publication, Distribution, etc. (Imprint  

[S.l.] : Princeton University., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

185 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-04, Section: B.

General Note  

Advisor: Loo, Yueh-Lin.

Dissertation Note  

Thesis (Ph.D.)--Princeton University, 2024.

Summary, Etc.  

요약Organic semiconductors are promising materials due to their tunable optical properties, facile processing, and mechanical flexibility. Advancing their applications requires a deeper understanding of organic semiconductors, particularly how intermolecular interactions can be manipulated to achieve selective complexation. Improving our understanding of organic semiconductor phosphorescence, an uncommon photophysical process of organic semiconductors, is also essential. Multi-component organic semiconductor systems are useful for such investigations. In exploring fullerene-buckybowl solution complexation, we identify extending buckybowl π-surfaces strengthens buckybowl-fullerene complexation. We find stronger complexation with fullerenes when the buckybowl dipole moment is increased through heteroatom inclusion.We investigate second-scale room temperature phosphorescence of organic semiconductors, a phenomenon known as ultralong room temperature phosphorescence (URTP). URTP is generally rare due to quenching by nonradiative recombination processes. We enable URTP in various organic semiconductors by embedding them in rigid polymer hosts and thermally annealing to induce sub-micron aggregation. We deduce sub-micron organic semiconductor aggregates suppress nonradiative recombination and reduce diffusional exciton quenching, and we propose URTP is more ubiquitous than previously thought.We find contorted hexabenzocoronene (cHBC) exhibits uniquely efficient red URTP. This stems from the proximity of a higher-lying triplet to the lowest-lying singlet enhancing intersystem crossing, and comparatively slow fluorescence decay. Eliminating C-H stretching modes, which disproportionately contribute to nonradiative recombination, by perdeuterating cHBC significantly prolongs its URTP lifetime, generating the longest-lived organic red-emitter to our knowledge. We developed a melt-processable perdeuterated cHBC and rubbery polymer composite that is compatible with 3D printing, enabling the development of customizable phosphorescent objects.We demonstrate ubiquitous access to URTP in nanoparticles comprising an organic semiconductor, homopolymer, and surfactant stabilizer made by flash nanoprecipitation (FNP). FNP offers precise control over nanoparticle size and composition. The URTP lifetime of the nanoparticle dispersions is stable to drying and redispersion. Moreover, this nanoparticle form factor is extendable to formulating anti-counterfeiting inks, or bioimaging.This thesis highlights the use of multi-component organic semiconductor systems to better understand the intermolecular interactions and photophysical phenomena governing their behavior. Using this insight, we realize unique properties of organic semiconductors that contribute to generating materials that can fit new applications.

Subject Added Entry-Topical Term  

Molecular physics.

Subject Added Entry-Topical Term  

Organic chemistry.

Subject Added Entry-Topical Term  

Molecular chemistry.

Index Term-Uncontrolled  

Aggregation

Index Term-Uncontrolled  

Buckybowls

Index Term-Uncontrolled  

Nanoparticles

Index Term-Uncontrolled  

Organic semiconductors

Index Term-Uncontrolled  

Photophysics

Added Entry-Corporate Name  

Princeton University Chemical and Biological Engineering

Host Item Entry  

Dissertations Abstracts International. 86-04B.

Electronic Location and Access  

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Control Number  

joongbu:656519