Study on a Highly Thermostable Dy³⁺-Activated Borophosphate Phosphor

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Developing multifunctional phosphors is challenging.
• High thermal stability is crucial for white-light-emitting diodes (LEDs).
• Thermal quenching resistance, while good for LEDs, hinders optical temperature sensing.

Purpose of the Study:

• To synthesize a highly thermostable phosphor for simultaneous lighting and thermometry applications.
• To investigate the luminescent and temperature-sensing properties of a novel phosphor.
• To evaluate the potential of the phosphor in white-LED devices and optical thermometry.

Main Methods:

• Synthesis of Ba₃(ZnB₅O₁₀)PO₄ (BZBP)-based phosphor doped with Dy³⁺.
• Characterization of luminescence properties under 350 nm excitation at various temperatures.
• Fabrication of a white-LED device using the synthesized phosphor.
• Assessment of temperature sensing using fluorescence intensity ratio (FIR) technology.

Main Results:

• The Dy³⁺-doped phosphor demonstrated excellent thermal stability, with only a 12% luminescence intensity loss up to 473 K.
• The fabricated white-LED device achieved a high color rendering index (R_a = 93) and a correlated color temperature (CCT) of 3996 K.
• The phosphor exhibited a maximum relative sensitivity of 0.0379 K^-1 at 298 K for temperature sensing via FIR.

Conclusions:

• The developed Dy³⁺-doped BZBP phosphor is suitable for high-stability white-LED lighting.
• The phosphor shows significant potential for accurate optical thermometry applications.
• This material offers a promising multifunctional solution for integrated lighting and sensing systems.