Ionic Liquid Engineered Defect-Driven Green Emitting Zero-Dimensional Cs4PbBr6 Microdisks
Debabrata Chakraborty1,2, Amit Akhuli1,2, Moloy Sarkar1,2
1School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute Jatni, Khurda, Bhubaneswar 752050, Odisha, India.
The Journal of Physical Chemistry Letters
|September 8, 2025
Summary
Researchers synthesized phase-pure zero-dimensional (0D) perovskite microdisks using ionic liquids. This method allows tuning of optical properties and confirms intrinsic green emission from defect-mediated recombination.
Area of Science:
- Materials Science
- Quantum Optics
- Nanotechnology
Background:
- Zero-dimensional (0D) perovskites are promising for optoelectronics due to unique excitonic properties.
- Challenges exist in producing phase-pure, size-tunable 0D perovskites and understanding their photophysics.
Purpose of the Study:
- To develop a room-temperature synthesis for phase-pure 0D perovskite microdisks.
- To investigate the influence of ionic liquids on morphology and optical characteristics.
- To elucidate the photophysical mechanisms behind the emission properties.
Main Methods:
- Ionic liquid (IL)-mediated antisolvent precipitation for Cs4PbBr6 microdisk synthesis.
- Morphological and structural characterization using TEM, SAED, PXRD, and EDX.
- Photoluminescence (PL) and fluorescence lifetime imaging microscopy (FLIM) for optical analysis.
- Temperature-dependent PL measurements to study emission mechanisms.
Main Results:
- Phase-pure Cs4PbBr6 microdisks synthesized via IL-mediated precipitation.
- Modulation of microdisk morphology and optical properties by varying IL parameters.
- Strong, intrinsic green emission confirmed, with no CsPbBr3 impurity contribution.
- Evidence of defect-mediated midgap recombination and high exciton-binding energy (~222 meV).
Conclusions:
- Ionic liquids are effective ligands for tuning 0D perovskite morphology and optical properties.
- The synthesized Cs4PbBr6 microdisks exhibit intrinsic green emission originating from defect-mediated recombination.
- This work provides a pathway for controlled synthesis of 0D perovskites for optoelectronic applications.
