Award Date

5-15-2026

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Chemistry and Biochemistry

First Committee Member

Dong-Chan Lee

Second Committee Member

Jun Kang

Third Committee Member

Zhange Feng

Fourth Committee Member

Jaeyun Moon

Number of Pages

215

Abstract

Small organic fluorophores that emit light in the far red (FR) and near-infrared (NIR) regions have attracted considerable attention due to their applications in optoelectronics and biomedical imaging. However, developing FR/NIR solid-state emitters is challenging due to aggregation-caused quenching (ACQ) and the energy gap law, both of which significantly reduce emission efficiency. This work presents systematic molecular engineering to achieve bright FR/NIR solid-state emission.

The dissertation is structured into three chapters: 1) Chapter 1 identifies a molecular side group that suppresses ACQ in the solid state. 2) in Chapter 2, the highly emissive platform found in Chapter 1 is modified with a terminal electron-acceptor, introducing a new strategy to enable solid-state emission in the NIR region. 3) Chapter 3 presents aggregation-induced dihedral angle compression (AIDAC) as a novel approach for enabling red-shifted emission with high quantum yields. Application of this concept in molecular design leads to the development of an efficient FR solid-state emitter. The work in this dissertation could provide general molecular design guidelines for developing efficient FR/NIR solid-state emitters.

Keywords

Aggregation-caused quenching (ACQ); Donor-acceptor; Fluorescence; Quantum yield; Solid-state emission; π-π interaction

Disciplines

Chemistry | Engineering Science and Materials | Materials Science and Engineering | Organic Chemistry

File Format

PDF

File Size

14500 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

Rights

IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/

Download

Available for download on Tuesday, May 15, 2029


Share

COinS