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Related Concept Videos

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...
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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.
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

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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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Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
07:03

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Published on: November 15, 2016

Bright terbium chelate phosphors.

E L Fink1

  • 1Lockheed Aircraft Service Company,Ontario, California 91764, USA.

Applied Optics
|January 12, 2010
PubMed
Summary
This summary is machine-generated.

Coordination with a tripyrazolylborate adduct significantly boosts radiative quantum efficiencies in terbium chelate phosphors. This enhancement is attributed to shielding the terbium ion from detrimental low-frequency vibrations within the solid-state resin.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Inorganic Chemistry

Background:

  • Terbium (Tb) compounds are known for their luminescent properties.
  • Enhancing the radiative quantum efficiency of phosphors is crucial for applications in lighting and displays.
  • Solid-state environments can introduce non-radiative decay pathways that reduce luminescence.

Purpose of the Study:

  • To investigate the effect of tripyrazolylborate adduct coordination on the photophysical properties of terbium chelate phosphors.
  • To determine the extent to which radiative quantum efficiencies can be improved.
  • To elucidate the mechanism behind the observed efficiency enhancement.

Main Methods:

  • Synthesis of terbium chelate phosphors coordinated with a tripyrazolylborate adduct.
  • Spectroscopic measurements to quantify radiative quantum efficiencies.
  • Analysis of vibrational modes to assess shielding effects.

Main Results:

  • A significant enhancement in radiative quantum efficiencies, up to a factor of ten, was observed.
  • Coordination with the tripyrazolylborate adduct effectively shields the terbium ion.
  • Low-frequency vibrations of the solid-state resin environment are mitigated.

Conclusions:

  • Tripyrazolylborate adducts are effective ligands for enhancing the luminescence of terbium chelate phosphors.
  • Shielding the central metal ion from lattice vibrations is a viable strategy to improve quantum efficiency.
  • This approach holds promise for developing advanced luminescent materials.