Sb³⁺-Doped Rb₂HfCl₆ Perovskites as High-Performance Thermally Stable Single-Component Phosphors for White...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Optoelectronics

Background:

• Inorganic lead-free double perovskites are essential for reliable optoelectronic devices.
• Dual-doped perovskite phosphors often exhibit poor color stability due to thermal and electron-phonon interaction differences.
• Addressing color instability in perovskite phosphors is critical for advanced applications.

Purpose of the Study:

• To synthesize a stable, lead-free inorganic perovskite phosphor.
• To investigate the luminescence properties and stability of Sb3+-incorporated Rb2HCl6.
• To evaluate the potential of Rb2HCl6:Sb for white light-emitting diode (WLED) applications.

Main Methods:

• Co-precipitation method used for synthesizing single-doped Sb3+-incorporated Rb2HCl6 perovskite crystals.
• Photoluminescence spectroscopy employed to analyze emission bands under UV excitation.
• Fabrication of a white LED prototype to assess performance and stability.

Main Results:

• Rb2HCl6:Sb exhibits broad dual emission bands from singlet and triplet self-trapped excitons, tunable from cyan to orange-red (400-800 nm).
• The fabricated white LED demonstrated a high color rendering index and excellent long-term stability.
• The material shows exceptional thermal stability (>90% emission intensity at 100 °C) and resistance to humidity and oxygen.

Conclusions:

• Single-doped Rb2HCl6:Sb offers a promising alternative to co-doped phosphors due to its environmental friendliness, simple fabrication, and stable performance.
• The material's tunable luminescence and robust stability make it an ideal candidate for high-performance WLEDs.
• This study represents significant progress in developing reliable and thermally stable optoelectronic materials.