Optimizing Upconversion Quantum Yield via Structural Tuning of Dipyrrolonaphthyridinedione Annihilators

Area of Science:

• Photophysical processes
• Organic chemistry
• Materials science

Background:

• Triplet-triplet annihilation upconversion (TTA-UC) converts low-energy photons to higher-energy ones.
• TTA-UC requires sensitizers and annihilator molecules.
• Limited annihilator families have been explored for TTA-UC applications.

Purpose of the Study:

• To investigate dipyrrolonaphthyridinediones (DPNDs) as novel annihilators for TTA-UC.
• To explore how structural modifications of DPNDs impact upconversion efficiency.
• To compare the performance of DPND annihilators with existing state-of-the-art materials.

Main Methods:

• Synthesis and characterization of novel dipyrrolonaphthyridinedione (DPND) derivatives.
• Photophysical studies to evaluate TTA-UC performance, including upconversion quantum yield (UCQY).
• Comparative analysis of DPNDs against established annihilators like rubrene.

Main Results:

• Dipyrrolonaphthyridinediones (DPNDs) were successfully employed as annihilators in TTA-UC systems.
• Structural modifications of DPNDs led to significant enhancements in upconversion quantum yield (UCQY).
• An optimized DPND annihilator achieved a maximum internal UCQY of 9.4%, nearly doubling that of rubrene.

Conclusions:

• DPNDs represent a promising new class of molecular annihilators for TTA-UC.
• Tailoring DPND structures is an effective strategy to boost TTA-UC efficiency.
• These findings expand the scope of molecular design for advanced photon upconversion technologies.