Photoinduced anion exchange for spatially patterned perovskite ASE: Enabling full-color pixelated lasing displays

Area of Science:

• Materials Science
• Optoelectronics
• Photonics

Background:

• Laser displays are crucial for augmented/virtual reality, wearables, and optical communications.
• Achieving full-color patterned lasing requires precise control over light emission.

Purpose of the Study:

• To develop an effective photoinduced vapor-solid anion exchange (PVAE) strategy for amplified spontaneous emission (ASE) control.
• To enable full-color tunable laser displays using CsPbX3 perovskites.

Main Methods:

• Regulating photoswitchable anion exchange in CsPbX3 (X = Cl, Br, I) perovskites via PVAE.
• Tuning anion exchange rates using illumination wavelength and intensity.
• Achieving compositional transitions (CsPbIBr2 → CsPbBr3 → CsPbClBr2) under UV activation.

Main Results:

• Demonstrated precise temporal modulation of ASE peaks across 470-710 nm full-color spectra.
• Achieved spatially modulated multicolor ASE patterns.
• Exhibited wide microscale emission wavelength modulation in both temporal and spatial domains.

Conclusions:

• PVAE is a dual-mode platform for high-precision pixelated laser displays.
• This strategy offers practical solutions for programmable high-resolution lasing displays and dynamic laser anticounterfeiting labels.