A centimeter-sized water-resistant blue-light-emitting zero-dimensional hybrid halide for solid-state lighting

Area of Science:

• Materials Science
• Solid-State Chemistry
• Photophysics

Background:

• Zero-dimensional (0D) organic-inorganic hybrid halides show promise for light emission.
• Environmental instability is a key limitation for these materials.
• Developing stable blue emitters is crucial for advanced lighting applications.

Purpose of the Study:

• To synthesize and characterize centimeter-sized single crystals of a novel 0D hybrid halide, (MAPPA)CdBr4·H2O.
• To investigate the photoluminescence properties and environmental stability of the synthesized material.
• To evaluate the material's performance in white light-emitting diodes (WLEDs).

Main Methods:

• Crystal growth of (MAPPA)CdBr4·H2O.
• Photoluminescence spectroscopy (excitation-wavelength-independent, power-dependent, temperature-dependent).
• Time-resolved spectroscopy and density functional theory (DFT) calculations.
• Environmental stability tests (water and air exposure).
• Fabrication and testing of WLED devices.

Main Results:

• Synthesized centimeter-sized (MAPPA)CdBr4·H2O single crystals with blue emission (PLQY 46.7%).
• Emission is excitation-independent and stable under varying power.
• Demonstrated remarkable environmental stability (50 days water, 150 days air).
• Achieved warm-white emission (CRI 91) in WLEDs with stable chromaticity.
• DFT calculations confirmed emission originates from Br-4p → Cd-5s/Br-4p transitions.

Conclusions:

• The synthesized (MAPPA)CdBr4·H2O is a robust 0D halide hybrid with excellent environmental stability.
• This material offers a viable pathway for developing stable blue emitters for next-generation solid-state lighting.
• The findings provide valuable design insights for future stable hybrid halide development.