Recent Research Progress of Mn⁴⁺-Doped A₂MF₆ (A = Li, Na, K, Cs, or Rb; M = Si, Ti, Ge, or Sn) Red Phosphors Based on...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• White light emitting diodes (WLEDs) are crucial for energy-efficient lighting, with red phosphors enhancing their quality.
• Manganese-4+ (Mn⁴⁺) doped fluoride phosphors show promise for WLEDs due to their optical properties and stability, but suffer from hydrolysis.
• Core-shell structures offer a solution to improve the water resistance of Mn⁴⁺-doped fluorides.

Purpose of the Study:

• To review the recent research progress on Mn⁴⁺-doped fluoride A₂MF₆ phosphors with core-shell structures for WLED applications.
• To analyze the impact of core-shell structures on luminescence, water resistance, and synthesis methods.
• To discuss future challenges and development directions in this field.

Main Methods:

• Literature review focusing on Mn⁴⁺-doped fluoride phosphors with core-shell structures.
• Analysis of shell layer classification, synthesis techniques, and luminescent mechanisms.
• Evaluation of the effect of core-shell structures on luminescent properties and water resistance.

Main Results:

• Core-shell structures significantly enhance the water resistance of Mn⁴⁺-doped fluoride phosphors.
• Various shell materials and synthesis methods are explored to optimize luminescent properties.
• The luminescent mechanism and spectral characteristics are influenced by the core-shell architecture.

Conclusions:

• Core-shell engineering is an effective strategy to overcome the hydrolysis limitations of Mn⁴⁺-doped fluoride phosphors.
• These improved phosphors are suitable for high-quality WLED applications.
• Further research is needed to address remaining challenges and unlock future potential.