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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...
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...

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Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
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An efficient, thermally stable cerium-based silicate phosphor for solid state white lighting.

Jakoah Brgoch1, Christopher K H Borg, Kristin A Denault

  • 1Solid State Lighting and Energy Center, University of California, Santa Barbara, Santa Barbara, California 93106, USA. jrbrgoch@mrl.ucsb.edu

Inorganic Chemistry
|July 5, 2013
PubMed
Summary
This summary is machine-generated.

A new cerium-doped barium yttrium silicate (Ba9Y2Si6O24:Ce(3+)) shows promise as a blue-green phosphor for solid-state lighting. Its efficient luminescence and tunable properties make it suitable for near-UV LED applications.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Luminescence

Background:

  • Development of efficient phosphors is crucial for advancing solid-state lighting technologies.
  • Cerium-doped silicates are explored for their luminescent properties.
  • Barium yttrium silicates offer a promising host lattice for luminescent ions.

Purpose of the Study:

  • To synthesize and characterize a novel cerium-substituted barium yttrium silicate phosphor.
  • To evaluate its photoluminescent properties for solid-state lighting applications.
  • To investigate the effects of cerium concentration and temperature on luminescence and explore color tunability.

Main Methods:

  • Synthesis of Ba9Y2Si6O24:Ce(3+) phosphor.
  • Structural characterization using synchrotron X-ray powder diffraction.
  • Photoluminescent characterization, including excitation and emission spectra, quantum yield measurements, and high-temperature studies.
  • Solid solution formation with scandium for color tuning.

Main Results:

  • The synthesized Ba9Y2Si6O24:Ce(3+) exhibits efficient blue-green emission with a quantum yield of approximately 60%.
  • The material shows strong excitation at 394 nm, suitable for near-UV LED excitation.
  • Concentration quenching of Ce(3+) occurs above ~3 mol%, and efficiency drops by 25% at 500 K.
  • Solid solutions with scandium (Ba9(Y(1-y)Sc(y))(1.94)Ce(0.06)Si6O24) allow for red-shifted, tunable emission.

Conclusions:

  • Ba9Y2Si6O24:Ce(3+) is an efficient blue-green phosphor with potential for near-UV LED applications.
  • The phosphor demonstrates good thermal stability and tunable emission properties through solid solution formation.
  • This material offers a viable pathway for developing advanced solid-state lighting solutions with customized color characteristics.