Novel red-emitting phosphors A₂HfF₆:Mn⁴⁺ (A = Rb⁺, Cs⁺) for solid-state lighting

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Developing efficient red-emitting phosphors is crucial for advanced lighting applications.
• Manganese-doped fluoride materials are explored for their luminescent properties.

Purpose of the Study:

• Synthesize and characterize novel single-phase red-emitting phosphors A₂HfF₆:Mn⁴⁺ (A = Rb⁺, Cs⁺).
• Investigate their structural and luminescence properties.
• Evaluate their potential for use in white light-emitting diodes (w-LEDs).

Main Methods:

• Ion exchange method for phosphor synthesis.
• Structural analysis (e.g., X-ray diffraction).
• Luminescence spectroscopy to determine excitation and emission profiles.
• Quantum yield measurements.
• Fabrication of LED devices.

Main Results:

• Successfully synthesized single-phase A₂HfF₆:Mn⁴⁺ phosphors.
• Observed broad blue excitation bands and intense red emission with high internal quantum yields (0.556 for Rb₂HfF₆:Mn⁴⁺, 0.652 for Cs₂HfF₆:Mn⁴⁺).
• Demonstrated high chemical and thermal stability.
• Fabricated w-LEDs with tunable color properties, optimizing optical performance.

Conclusions:

• A₂HfF₆:Mn⁴⁺ phosphors exhibit excellent luminescent properties and stability.
• These phosphors are highly promising for enhancing the performance of white light-emitting diodes (w-LEDs).
• The synthesized materials offer a viable route for next-generation lighting solutions.