Environmentally Friendly Synthesis of Near-Unity UV/Violet-Emitting Cerium-Based Metal Halides with Reversible...

Area of Science:

• Materials Science
• Photochemistry
• Solid-State Chemistry

Background:

• Efficient UV and violet luminescent materials are crucial for photoelectric applications.
• Conventional synthesis methods face challenges with scalability, harsh conditions, and toxic solvents.

Purpose of the Study:

• To develop a green, low-cost, and scalable synthesis for high-efficiency UV-violet phosphors.
• To explore the potential of these materials in advanced applications like information security.

Main Methods:

• Solution-phase synthesis of Cs3CeCl6·3H2O and Cs3CeCl6.
• Photoluminescence quantum yield (PLQY) measurements.
• Investigation of reversible phase transitions triggered by external stimuli.

Main Results:

• Achieved high PLQY values of 93.54% for Cs3CeCl6·3H2O and 91.82% for Cs3CeCl6.
• Cs3CeCl6·3H2O exhibits dual emission peaks at 334 and 356 nm, among the shortest for metal halide perovskites.
• Demonstrated reversible phase transitions responsive to thermal, solvent, and moisture stimuli.

Conclusions:

• Introduced a new family of highly efficient UV-violet phosphors via a scalable green synthesis.
• Established a multilevel information encryption system based on the material's stimuli-responsive phase transitions.
• Highlighted novel design strategies for smart luminescent materials in information security and anticounterfeiting.