Realizing Near-Unity Photoluminescence Efficiency in Antimony-Doped Indium-Based Halides Induced by Strong...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Photophysics

Background:

• Developing zero-dimensional (0D) hybrid halides with large Stokes shifts and efficient broad-band emission is crucial for solid-state lighting (SSL).
• Challenges remain in creating highly emissive, stable, and low-toxicity 0D hybrid halides for SSL applications.

Purpose of the Study:

• To explore a novel indium-based 0D hybrid halide with enhanced photoluminescence properties.
• To investigate the potential of this material as a phosphor for white-light-emitting diodes (WLEDs).

Main Methods:

• Synthesis of a novel indium-based metal halide, A5In2Cl16·4H2O, featuring isolated inorganic octahedrons.
• Sb-doping to induce broad-band yellow emission.
• Experimental and theoretical studies to understand the emission mechanism (triplet self-trapped excitons).
• Fabrication of WLED devices using the synthesized phosphor.

Main Results:

• Sb-doped A5In2Cl16·4H2O exhibits efficient broad yellow emission with a photoluminescence quantum yield (PLQY) up to 98%.
• The emission originates from triplet self-trapped excitons in [SbCl6]3- octahedrons due to strong electron-phonon coupling.
• A WLED device using the material achieved a color rendering index of 87.8 and luminous efficiency of 36.18 lm/W.

Conclusions:

• The developed indium-based hybrid halide is a promising candidate for environmentally friendly, efficient, and stable UV-excited broad-band emission materials.
• This material demonstrates significant potential for practical applications in solid-state lighting.
• The study provides insights into designing high-performance luminescent materials based on hybrid halides.