Anti-Thermal-Quenching Phosphors Based on Metal Halides.

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Thermal quenching (TQ) in phosphors limits applications at elevated temperatures due to nonradiative transitions.
• Current commercial anti-TQ phosphors primarily use metal oxides and nitrides, despite their rigid lattices.
• Metal halides, with inherently soft lattices, have emerged as promising anti-TQ materials since 2017.

Purpose of the Study:

• To review recent advances in anti-TQ metal halide phosphors.
• To discuss the mechanisms and applications of these materials.
• To highlight the potential of metal halides for high-power/high-temperature applications.

Main Methods:

• Literature review of anti-TQ metal halides published from 2017 to present.
• Analysis of structural design principles for anti-TQ phosphors.
• Discussion of optical-physical processes and synthesis methods.

Main Results:

• Metal halides demonstrate significant progress as anti-TQ phosphors, challenging the dominance of oxides and nitrides.
• Low synthesis temperatures and high photoluminescence quantum yields (PLQYs) are key advantages.
• The underlying anti-TQ mechanisms in soft-lattice metal halides are increasingly understood.

Conclusions:

• Metal halide phosphors are promising candidates for anti-TQ applications due to their favorable properties.
• Further fundamental research into their optical-physical processes is warranted.
• These materials offer opportunities for developing phosphors for demanding environments.