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Related Concept Videos

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...
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...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
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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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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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

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Published on: November 15, 2016

Phosphorescence enhancement triggered by pi stacking in solid-state [Cu(N-N)(P-P)]BF4 complexes.

Liming Zhang1, Bin Li, Zhongmin Su

  • 1Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 28, 2009
PubMed
Summary

Researchers observed enhanced phosphorescence in copper complexes ([Cu(N-N)(P-P)]BF4) in solid form. This enhancement, driven by molecular pi-stacking, results in a blue shift, higher quantum yield, and longer excited-state lifetime.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Coordination Chemistry

Background:

  • Copper complexes with diimine ligands are known for their photoluminescent properties.
  • Understanding solid-state phenomena is crucial for developing advanced optical materials.

Purpose of the Study:

  • To investigate and explain the phosphorescence enhancement phenomenon in [Cu(N-N)(P-P)]BF4 complexes in the solid state.
  • To identify the underlying mechanism responsible for the observed photophysical changes.

Main Methods:

  • Synthesis of [Cu(N-N)(P-P)]BF4 complexes.
  • Solid-state photoluminescence spectroscopy to measure emission spectra, quantum yields, and excited-state lifetimes.
  • Analysis of molecular packing and intermolecular interactions, specifically pi-stacking.

Main Results:

  • Observed significant phosphorescence enhancement in the solid state, characterized by an emission blue shift.
  • Documented a substantial increase in photoluminescence quantum yield.
  • Measured a prolonged excited-state lifetime compared to solution or amorphous states.
  • Correlated the enhancement with the suppression of nonradiative decay pathways due to intermolecular pi-stacking.

Conclusions:

  • The phosphorescence enhancement in [Cu(N-N)(P-P)]BF4 complexes is attributed to the suppression of nonradiative processes facilitated by pi-stacking interactions in the solid state.
  • The presence of pi surfaces in the diimine ligands promotes this intermolecular interaction, leading to widespread phosphorescence enhancement in this class of copper complexes.