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Related Concept Videos

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...
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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.
A pair of electrons in a...
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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Crystal Field Theory - Octahedral Complexes02:58

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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.
CFT focuses on...
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Valence Bond Theory

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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Related Experiment Video

Updated: Jun 23, 2026

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

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Published on: November 15, 2016

Phosphorescent iridium(III) complexes: toward high phosphorescence quantum efficiency through ligand control.

Youngmin You1, Soo Young Park

  • 1Department of Materials Science & Engineering, Seoul National University, San 56-1, Shillim-Dong, Kwanak-Gu, Seoul 151-744, Korea.

Dalton Transactions (Cambridge, England : 2003)
|May 26, 2009
PubMed
Summary

Researchers reviewed eight methods to boost phosphorescence quantum efficiency in iridium(III) complexes by modifying ligand structures. Understanding these intramolecular controls is key for developing efficient organic light-emitting devices (OLEDs).

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Area of Science:

  • Materials Science
  • Photochemistry
  • Organic Electronics

Background:

  • Iridium(III) complexes are crucial for highly efficient electrophosphorescence in organic light-emitting devices (OLEDs).
  • Significant advancements have been made in color-tunability, stability, and efficiency of these complexes.
  • However, a collective understanding of structure-property relationships for phosphorescence quantum efficiency remains underdeveloped.

Purpose of the Study:

  • To comprehensively review methods for achieving high phosphorescence quantum efficiency in iridium(III) complexes.
  • To explore the relationship between ligand structure modifications and phosphorescence quantum efficiency.
  • To provide guidelines for developing more efficient phosphorescent iridium(III) complexes.

Main Methods:

  • Review of eight distinct intramolecular control methods to enhance phosphorescence quantum efficiency.
  • Analysis of ligand structure variations, including geometric isomer control, rigid structures, and substituent effects.
  • Examination of excited state interactions, such as mixing of 1MLCT and 3LC states, and energy transfer mechanisms.

Main Results:

  • Ligand structure modulation profoundly impacts both phosphorescence color and quantum efficiency.
  • Methods include geometric isomer control, restricted intramolecular motion, state mixing, and dendrimer incorporation.
  • Sensitized phosphorescence and confinement of emissive regions are also effective strategies.

Conclusions:

  • Judicious selection and chelate disposition of ligand structures are critical for optimizing phosphorescence efficiency.
  • Understanding intramolecular excited state interactions is key to controlling radiative and non-radiative transitions.
  • The reviewed guidelines offer a pathway for designing superior phosphorescent iridium(III) complexes for OLED applications.