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Related Concept Videos

Phase Transitions02:31

Phase Transitions

Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...

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Updated: Jun 30, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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All-Optically Switchable Platform Based on Phase-Change Material for Light-Emitting Device.

Olga Kushchenko1, Elena Bodiago1, Daniil Litvinov1

  • 1School of Physics and Engineering, ITMO University, St Petersburg 197101, Russia.

ACS Applied Materials & Interfaces
|December 18, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel optoelectronic device using phase-change materials (PCMs) and perovskite emitters. This innovation enables reversible control of light emission and the creation of rewritable patterns in LEDs.

Keywords:
Ge2Sb2Te5all-optical switchingemission patternshalide perovskiteslight-emitting devicesphase-change materials

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Area of Science:

  • Photonics and optoelectronics
  • Materials science
  • Device engineering

Background:

  • Phase-change materials (PCMs) are crucial in photonics, optoelectronics, and electronics.
  • PCMs offer tunable optical and electronic properties via phase switching.
  • Integrating PCMs with light-emitting materials enhances device functionality.

Purpose of the Study:

  • To develop a novel optoelectronic device integrating a perovskite emitter with a phase-change material.
  • To demonstrate reversible on/off control of electroluminescence (EL) via PCM phase switching.
  • To achieve pattern writing capabilities in EL devices without lithography.

Main Methods:

  • Fabrication of an optoelectronic device combining a perovskite emitter and a PCM.
  • Utilizing PCM phase transitions to modulate EL output.
  • Employing localized phase modification for pattern generation.

Main Results:

  • Demonstrated reversible on/off control of electroluminescence.
  • Achieved the ability to write distinct emission patterns by locally altering PCM phase.
  • Showcased pattern rewritability without the need for lithography.

Conclusions:

  • The developed device offers a new pathway for fast-response LEDs.
  • Enables reconfigurable and repeatedly rewritable emission patterns.
  • Highlights the potential of PCM-integrated perovskite devices for advanced optoelectronics.