Precise Hue Control in a Single-Component White-Light Emitting Perovskite Cs₂ SnCl₆ through Defect Engineering Based...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• All-inorganic perovskites offer high photoluminescence (PL) efficiency for solid-state lighting due to abundant energy states for self-trapped excitons (STE).
• Achieving stable, single-component white light emitters remains a challenge in materials science.

Purpose of the Study:

• To realize a single-component white light emitter using a perovskite material.
• To investigate the mechanism of dual emissions and tunable white light properties.
• To understand the impact of heterovalent doping on material properties.

Main Methods:

• Synthesis of single-component perovskite Cs₂ SnCl₆ :La³⁺ microcrystals.
• Characterization of photoluminescence properties, including dual emission bands.
• Investigation of tunable white light properties via energy transfer and compositional variation.
• Density Functional Theory (DFT) calculations to study electronic structure and defect states.

Main Results:

• A single-component perovskite Cs₂ SnCl₆ :La³⁺ microcrystal exhibited dual emissions (blue and yellow) from self-trapped excitons (STE1 and STE2).
• The blue emission (450 nm) originated from the intrinsic Cs₂ SnCl₆ host, while the yellow emission (560 nm) was induced by La³⁺ doping.
• Tunable white light hue was achieved by controlling energy transfer, excitation wavelength, and Sn⁴⁺ /Cs⁺ ratios.
• DFT calculations and experimental results confirmed the influence of La³⁺ doping on electronic structure and defect states.

Conclusions:

• A facile approach for novel single-component white light emitters was demonstrated using perovskite Cs₂ SnCl₆ :La³⁺.
• The study provides fundamental insights into defect chemistry in heterovalent ion-doped perovskite luminescent crystals.
• This work paves the way for advanced applications in solid-state lighting.