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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

965
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
965

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Updated: Jan 7, 2026

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Programmable Light-Driven Color Tuning of Perovskite Quantum Dots.

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  • 1Dept. of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27606, United States.

ACS Central Science
|December 31, 2025
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Summary
This summary is machine-generated.

We developed a self-driving lab to precisely tune metal halide perovskite nanocrystal bandgaps using light. This method optimizes optical properties and scales efficiently for industrial applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Precise bandgap tuning of metal halide perovskite (MHP) nanocrystals (NCs) is crucial for optoelectronics and photocatalysis.
  • Photoinduced anion exchange reactions (PIAERs) offer control but face challenges in mechanistic understanding and optimization due to a vast parameter space.

Purpose of the Study:

  • To develop a material-efficient, autonomous system for optimizing PIAERs in MHPs.
  • To enable precise, scalable, and sustainable bandgap tuning of MHP nanocrystals across the UV-visible spectrum.

Main Methods:

  • Integration of a single-droplet microfluidic photoreactor, in situ spectroscopy, and Bayesian optimization within a fluidic self-driving laboratory (FSDL).
  • Machine learning-guided exploration of a complex parameter landscape to identify optimal synthesis conditions.
  • Surrogate modeling to derive mechanistic insights into anion exchange kinetics.

Main Results:

  • The FSDL autonomously identified synthesis conditions maximizing photoluminescence quantum yield and minimizing emission line width for target wavelengths.
  • Distinct kinetic regimes for Br-→Cl- and Br-→I- exchanges were revealed, enabling reaction-specific tuning.
  • Protocols scaled from droplet (∼10 μL) to continuous-flow (∼50-250 mL·day-1) without reoptimization, maintaining performance and demonstrating knowledge scalability across 4 orders of magnitude in throughput.

Conclusions:

  • The FSDL provides a reproducible, mechanistically informed route for programmable, light-directed bandgap tuning in MHP NCs.
  • This approach is industrially relevant, scalable, and energy-efficient, paving the way for advanced MHP applications.