(Poly)terephthalates with Efficient Blue Emission in the Solid State

Area of Science:

• Organic Chemistry
• Materials Science
• Photophysics

Background:

• Terephthalate derivatives are important building blocks in polymer chemistry.
• Tuning electronic properties of organic molecules is crucial for developing advanced materials.
• Fluorescent materials are essential for applications in lighting, displays, and sensing.

Purpose of the Study:

• To synthesize novel dialkoxyterephthalates and explore their photophysical properties.
• To investigate the potential of these compounds as fluorescent materials in solid-state applications.
• To develop blue fluorescent polymers and achieve white light emission.

Main Methods:

• Synthesis of dialkoxyterephthalates via alkylation and subsequent reactions.
• Characterization using absorption spectroscopy and theoretical calculations (Density Functional Theory).
• Evaluation of fluorescence quantum yields in solution and solid-state (PMMA films, powders).
• Copolymerization to create fluorescent polymers and doping for white light emission.

Main Results:

• Dialkoxyterephthalates were synthesized in good-to-high yields.
• Absorption spectra showed a band assignable to intramolecular charge-transfer.
• Compounds exhibited moderate-to-excellent blue fluorescence quantum yields in solution and solid state.
• Solid-state quantum yields were comparable or higher for diisopropoxy derivatives than dimethoxy.
• Copolymerization yielded brilliantly blue fluorescent polymers with high quantum yields.
• White emission was achieved by doping blue fluorescent polymers with a yellow emitter.

Conclusions:

• Dialkoxyterephthalates are promising blue emitters with efficient solid-state fluorescence.
• The synthesized polymers demonstrate potential for optoelectronic applications.
• Doping strategies can be employed to tune emission color, achieving white light.