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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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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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IR Absorption Frequency: Delocalization01:04

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Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Photoelectric Effect02:26

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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Giant five-photon absorption from multidimensional core-shell halide perovskite colloidal nanocrystals.

Weiqiang Chen1, Saikat Bhaumik2, Sjoerd A Veldhuis2

  • 1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University (NTU), 21 Nanyang Link, SPMS-PAP 03-05, Singapore 637371, Singapore.

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Halide perovskite nanocrystals demonstrate unprecedented five-photon absorption, overcoming limitations of organic molecules and conventional semiconductors. This breakthrough offers significant advantages for advanced multiphoton imaging applications.

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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Multiphoton absorption is crucial for applications like in vivo imaging and photodynamic therapy.
  • Higher-order nonlinear absorption, such as five-photon absorption, offers enhanced spatial confinement and penetration depth for bioimaging.
  • Organic chromophores and semiconductor nanocrystals have limitations in five-photon absorption efficiency.

Purpose of the Study:

  • To investigate halide perovskite colloidal nanocrystals for efficient higher-order multiphoton absorption.
  • To explore the potential of these nanocrystals in overcoming current limitations in five-photon absorption applications.
  • To demonstrate the feasibility of using perovskite nanocrystals for next-generation multiphoton imaging.

Main Methods:

  • Synthesis of multidimensional type I core-shell halide perovskite nanocrystals (methylammonium lead bromide/octylammonium lead bromide).
  • Characterization of five-photon absorption and upconversion fluorescence properties.
  • Comparison of five-photon action cross-sections with organic molecules and conventional semiconductor nanocrystals.

Main Results:

  • Halide perovskite nanocrystals exhibit highly efficient five-photon-excited upconversion fluorescence.
  • These nanocrystals possess five-photon action cross-sections at least 9 orders larger than state-of-the-art organic molecules.
  • The performance is unprecedented for semiconductor nanocrystals in five-photon absorption.

Conclusions:

  • Halide perovskite nanocrystals transcend current limitations in five-photon absorption.
  • Their superior performance opens new avenues for advanced multiphoton imaging.
  • These materials represent a significant advancement for next-generation bioimaging technologies.