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Photoluminescence: Applications01:14

Photoluminescence: Applications

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...
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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.
A pair of electrons in a...
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

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...
Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.

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Related Experiment Video

Updated: May 23, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
14:11

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Published on: June 10, 2021

Phosphorescent perylene imides.

Barbara Ventura1, Heinz Langhals, Bernd Böck

  • 1Istituto ISOF-CNR, Via P. Gobetti 101, 40129 Bologna, Italy.

Chemical Communications (Cambridge, England)
|March 23, 2012
PubMed
Summary

Asymmetrically substituted perylene imide derivatives PIa and PIx exhibit phosphorescence at 77 K. These compounds show distinct triplet energies and lifetimes, confirmed by C(60) triplet sensitization experiments.

Area of Science:

  • Organic Chemistry
  • Photophysics
  • Materials Science

Background:

  • Perylene imide derivatives are known for their photophysical properties.
  • Phosphorescence in organic molecules is crucial for applications like organic light-emitting diodes (OLEDs).
  • Understanding triplet state dynamics is key to controlling luminescence.

Purpose of the Study:

  • To investigate the phosphorescence properties of asymmetrically substituted perylene imide derivatives (PIa and PIx).
  • To determine the triplet energies and lifetimes of PIa and PIx.
  • To confirm triplet energy levels using sensitization experiments.

Main Methods:

  • Synthesis of asymmetrically substituted perylene imide derivatives PIa and PIx.
  • Phosphorescence spectroscopy in glassy matrices at 77 K.

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Last Updated: May 23, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
14:11

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

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Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
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Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
06:08

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera

Published on: December 27, 2018

  • Triplet sensitization experiments using C(60) triplet.

    • Main Results:

    • PIa and PIx exhibit phosphorescence at cryogenic temperatures (77 K).
    • PIa shows a phosphorescence lifetime of 49.0 ms and a triplet energy of 1.79 eV.
    • PIx displays a lifetime of 13.5 ms and a triplet energy of 1.68 eV.

    Conclusions:

    • Asymmetric substitution significantly influences the phosphorescence characteristics of perylene imides.
    • The determined triplet energies and lifetimes provide insights into their potential for optoelectronic applications.
    • Sensitization experiments validate the triplet energy levels of these novel compounds.