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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...
Colors and Magnetism03:02

Colors and Magnetism

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.
Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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...
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.
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...

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Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
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Published on: November 15, 2016

A novel reddish-orange phosphor, NaLi2PO4:Eu3+.

K N Shinde1, S J Dhoble

  • 1NS Science and Arts College, Bhadrawati, Chandrapur 442902, India. kartik_shinde@rediffmail.com

Luminescence : the Journal of Biological and Chemical Luminescence
|February 25, 2012
PubMed
Summary

Novel reddish-orange phosphors based on sodium lithium phosphate (NaLi(2)PO(4)) doped with europium (Eu(3+)) were synthesized. These materials show efficient near-UV excitation and strong emission, with optimal performance at 1 mol% europium concentration.

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Phase-Dependent Control of Trap Depth and Persistent Luminescence in Strontium Aluminate Phosphors

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Area of Science:

  • Materials Science
  • Solid-state Chemistry
  • Luminescence

Background:

  • Development of novel phosphors is crucial for advanced lighting and display technologies.
  • Europium (Eu(3+)) ions are well-known for their characteristic emission in the visible spectrum, particularly red and orange hues.
  • Phosphate-based materials offer a versatile host for luminescent dopants.

Purpose of the Study:

  • To synthesize and characterize novel Eu(3+)-activated NaLi(2)PO(4) phosphors.
  • To investigate the photoluminescence properties, including excitation and emission spectra.
  • To understand the effect of Eu(3+) doping concentration on luminescence and identify concentration quenching mechanisms.

Main Methods:

  • Solid-state reaction method for phosphor synthesis.
  • X-ray diffraction (XRD) for structural analysis.
  • Photoluminescence (PL) spectroscopy for optical property evaluation at room temperature.

Main Results:

  • Successful synthesis of Eu(3+)-activated NaLi(2)PO(4) phosphors.
  • Effective excitation by near-UV light (370-410 nm).
  • Strong reddish-orange emission attributed to Eu(3+) 5D(0) → 7FJ transitions, with 5D(0) → 7F(1) being dominant.
  • Concentration quenching observed at 1 mol% Eu(3+) doping.

Conclusions:

  • NaLi(2)PO(4):Eu(3+) phosphors are promising candidates for reddish-orange emitting materials.
  • The luminescence properties are strongly dependent on Eu(3+) concentration.
  • Understanding the quenching mechanism is key for optimizing phosphor performance.