Highly Efficient Broadband Yellow Phosphor Based on Zero-Dimensional Tin Mixed-Halide Perovskite.

Area of Science:

• Materials Science
• Solid-State Chemistry
• Photonics

Background:

• Organic-inorganic hybrid metal halide perovskites are promising for white light-emitting diodes (WLEDs).
• Controlling perovskite structure tunes emission properties from narrow to broadband.
• Existing phosphors often rely on rare-earth elements.

Purpose of the Study:

• To develop a highly efficient, rare-earth-free broadband yellow light emitter.
• To investigate zero-dimensional tin mixed-halide perovskites for WLED applications.
• To demonstrate the performance of the developed emitter in UV-pumped WLEDs.

Main Methods:

• Synthesized a zero-dimensional tin mixed-halide perovskite: (C4N2H14Br)4SnBrxI6-x (x = 3).
• Characterized the material's photoluminescence properties, including emission spectrum and quantum efficiency.
• Fabricated UV-pumped WLEDs using the synthesized yellow emitter and a commercial blue phosphor.

Main Results:

• Achieved a broadband yellow emission peaking at 582 nm with a large full width at half-maximum (126 nm).
• Obtained a high photoluminescence quantum efficiency of approximately 85% at room temperature.
• Demonstrated WLEDs with high color rendering indexes (up to 85) using the novel phosphor.

Conclusions:

• Zero-dimensional tin mixed-halide perovskites are effective broadband yellow light emitters.
• The developed material offers a rare-earth-free alternative for efficient WLEDs.
• This phosphor enables high-performance WLEDs with excellent color rendering.