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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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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...
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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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Intensity-Modulated Photoluminescence Spectroscopy for Revealing Ionic Processes in Halide Perovskites.

Sarah C Gillespie1,2, Agustin O Alvarez1, Jarla Thiesbrummel1

  • 1LMPV-Sustainable Energy Materials Department, AMOLF Institute, Science Park 104 Amsterdam, 1098XG, The Netherlands.

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|July 17, 2025
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Intensity-modulated photoluminescence spectroscopy (IMPLS) offers a new, contact-free optical method to study mobile ions in halide perovskites. This technique overcomes limitations of electrical methods, enabling better understanding of ion diffusion crucial for device performance.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Photonic Devices

Background:

  • Mobile ions in halide perovskites significantly impact device performance, but their properties are difficult to quantify.
  • Existing electrical techniques are limited to operational devices and can be obscured by interfacial recombination, hindering the study of ionic contributions.

Purpose of the Study:

  • To introduce and validate intensity-modulated photoluminescence spectroscopy (IMPLS) as a fully optical, contact-free method for characterizing mobile ions in halide perovskites.
  • To demonstrate IMPLS's capability in distinguishing between different ionic processes, such as defect formation and diffusion.

Main Methods:

  • Utilized intensity-modulated photoluminescence spectroscopy (IMPLS) to measure photoluminescence intensity amplitude and phase as a function of excitation modulation frequency.
  • Applied an optical equivalent circuit model to fit the IMPLS data obtained from a Cs$_{0.07}$(FA$_{0.83}$MA$_{0.17}$)$_{0.93}$Pb-(I$_{0.83}$Br$_{0.17}$)$_{3}$ perovskite film.
  • Correlated IMPLS findings with intensity-modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS) measurements on corresponding devices.

Main Results:

  • Identified two characteristic lifetimes from IMPLS data: 2.1 ms (likely defect formation) and 77 s (likely ionic diffusion).
  • The observed ionic diffusion feature aligns with results from IMPS/IMVS measurements.
  • Demonstrated IMPLS's effectiveness on various perovskite sample types, including films and full devices.

Conclusions:

  • IMPLS is a powerful, non-invasive optical technique for characterizing slow ionic processes in halide perovskites.
  • This method overcomes the limitations of electrical characterization, providing new insights into mobile ion behavior.
  • IMPLS significantly expands the available toolkit for understanding and optimizing perovskite materials for electronic and photonic applications.