Single-composition Al³⁺-singly doped ZnO phosphors for UV-pumped warm white light-emitting diode applications

Area of Science:

• Materials Science
• Solid-State Lighting
• Luminescence

Background:

• High-quality white light is crucial for advanced light-emitting devices.
• Developing full-visible-spectrum phosphors is key to achieving superior light quality.

Purpose of the Study:

• To report a novel broad-band-emitting phosphor based on single-composition Al-doped ZnO.
• To evaluate its performance for UV-pumped warm white light-emitting diodes (WLEDs).

Main Methods:

• Synthesized Al-doped ZnO phosphors.
• Characterized photoluminescence properties under UV excitation.
• Fabricated a prototype WLED using the developed phosphor.

Main Results:

• The Al-doped ZnO phosphor exhibited full spectrum emission (400-800 nm) with a quantum efficiency of 43%.
• Achieved a prototype UV-pumped warm WLED with a high color rendering index (CRI) of 87 and a correlated color temperature (CCT) of 4067 K.
• Demonstrated promising performance with an activation energy of 0.22 eV.

Conclusions:

• Single-composition Al3+-singly doped ZnO phosphor is a viable candidate for UV-pump warm white LEDs.
• The developed phosphor shows potential for next-generation lighting applications requiring high light quality.