Engineering a Reversible Primary Battery Structure in SrZnOS:Eu²⁺,Dy³⁺ for Multi-Modal Red Luminescence

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Developing efficient red phosphors activated by divalent europium (Eu²⁺) under visible light is crucial for photonics, optoelectronics, and white-light-emitting diodes (LEDs).
• Existing materials often require ultraviolet (UV) excitation, limiting their application scope and efficiency.

Purpose of the Study:

• To rationally design a novel SrZnOS:Eu²⁺,Dy³⁺ phosphor with high-density traps and a double metastable state.
• To achieve robust red luminescence under visible light excitation for advanced applications.
• To explore multi-modal luminescence properties for potential use in secure information storage and displays.

Main Methods:

• Engineered the SrZnOS matrix by constructing a reversible infinitesimal photoelectrochemical layered micro-unit battery structure.
• Co-doped the matrix with divalent europium (Eu²⁺) and trivalent dysprosium (Dy³⁺) ions.
• Characterized the photoluminescence, persistent luminescence, and stimulated luminescence properties.

Main Results:

• Synthesized SrZnOS:Eu²⁺,Dy³⁺ exhibiting intense red photoluminescence at 620 nm under 468 nm visible light excitation.
• Achieved emission intensity comparable to commercial UV-excited phosphors.
• Demonstrated multi-modal luminescence, including red persistent luminescence and tunable photo/thermo/mechano-stimulated luminescence.

Conclusions:

• The engineered SrZnOS:Eu²⁺,Dy³⁺ phosphor is a promising candidate for visible light-driven red emission applications.
• The material's multi-modal luminescence properties open avenues for secure information storage and advanced display technologies.
• Photoelectrochemical cell engineering provides a viable strategy for designing functional oxide-based luminescent materials.