High-performance electro-optic materials featuring enhanced thermal stability through dual-donor structural...

Area of Science:

• Materials Science
• Organic Chemistry
• Optoelectronics

Background:

• Organic electro-optic (EO) materials are vital for next-generation optoelectronic transceivers, requiring high EO efficiency and thermal stability.
• Current limitations include restricted chromophore loading and poor thermal stability during processing and application, hindering EO performance.

Purpose of the Study:

• To develop novel organic EO materials with improved chromophore loading and thermal stability.
• To investigate a dual-donor crosslinking strategy for enhancing molecular orientation and material robustness.

Main Methods:

• Synthesis of binary crosslinkable dual-donor chromophores (YZ1-YZ6) utilizing Diels-Alder and Huisgen cycloaddition reactions.
• Formation of polymeric crosslinked networks via electric-field poling at specific temperatures.
• Characterization of crosslinked films for EO coefficients, glass transition temperatures (Tg), and chromophore densities.

Main Results:

• Achieved large EO coefficients ranging from 257-301 pm/V.
• Obtained elevated glass transition temperatures (Tg) between 107-187°C.
• Demonstrated high chromophore densities of 3.73-4.26 × 10^20 molecules cm^-3.
• Exhibited excellent long-term thermal stability, with films retaining over 95% of initial r33 values after 500 hours at 85°C.

Conclusions:

• The proposed dual-donor crosslinking strategy effectively enhances thermal stability and EO performance in organic materials.
• This molecular-engineering approach enables the systematic development of high-performance organic EO materials for optoelectronic applications.