Photon upconversion sensitized by earth-abundant transition metal complexes.

Area of Science:

• Materials Science
• Photochemistry
• Sustainable Chemistry

Background:

• Sensitized triplet-triplet annihilation upconversion (sTTA-UC) is a process converting two low-energy photons into one high-energy photon.
• Traditional sTTA-UC relies on expensive noble metal photosensitizers (e.g., Pt, Pd, Os) with excellent photophysical properties.
• There is a growing need for sustainable and cost-effective alternatives in upconversion technologies.

Purpose of the Study:

• To review recent advancements in sTTA-UC using earth-abundant transition metal complexes.
• To explore the energy transfer mechanisms and upconversion performance of these novel materials.
• To discuss their applications and future perspectives in catalysis and energy conversion.

Main Methods:

• Literature review of recent research on earth-abundant transition metal complexes in sTTA-UC.
• Analysis of energy transfer pathways and photophysical properties.
• Evaluation of upconversion efficiency and application-specific performance.

Main Results:

• Earth-abundant 3d (Cr, Mn, Fe, Co, Cu, Zn) and 4d (Zr, Mo) metal complexes demonstrate significant potential as photosensitizers.
• These complexes offer advantages including lower cost, reduced toxicity, and enhanced sustainability.
• Promising upconversion performance and diverse applications in catalysis and energy conversion have been reported.

Conclusions:

• Earth-abundant transition metal complexes represent a viable and sustainable alternative to noble metals for sTTA-UC.
• Further research into these materials can drive innovation in photocatalysis, energy conversion, and other fields.
• Development of novel photosensitizers based on earth-abundant metals is crucial for future applications.