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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

386
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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Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

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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.
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Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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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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Phosphor Ceramic Composite for Tunable Warm White Light.

Ross A Osborne1,2, Nerine J Cherepy1, Peter S Bleier2

  • 1Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, CA 94550, USA.

Materials (Basel, Switzerland)
|July 13, 2024
PubMed
Summary

New composite phosphor ceramics using K2SiF6:Mn4+ (KSF) and Y3Al5O12:Ce3+ (YAG) achieve warm white LED light. These materials offer improved thermal conductivity and reduced droop for advanced lighting applications.

Keywords:
LEDsceramicscompositeslightingphosphors

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Area of Science:

  • Solid-state lighting
  • Materials science
  • Luminescence

Background:

  • Developing efficient and stable phosphors is crucial for high-quality LED lighting.
  • Traditional phosphor-in-glass or phosphor-in-silicone technologies face limitations in thermal management and long-term stability.
  • Narrowband red phosphors and yellow phosphors are key components for achieving warm white light emission in LEDs.

Purpose of the Study:

  • To fabricate and characterize composite phosphor ceramics for warm white LED lighting.
  • To investigate the optical and thermal properties of K2SiF6:Mn4+ (KSF) and Y3Al5O12:Ce3+ (YAG) composites.
  • To explore the potential of these composites for high-performance LED applications.

Main Methods:

  • Fabrication of composite phosphor ceramics with KSF as the matrix and YAG as dispersed particles.
  • Optical characterization of emission spectra under blue LED excitation, varying YAG loading and ceramic thickness.
  • Measurement of thermal conductivity and color quality parameters (color temperature, CRI, R9).

Main Results:

  • Achieved warm white light with a color temperature of 2716 K, a high Color Rendering Index (CRI) of 92.6, and an R9 value of 77.6.
  • Observed a modest improvement in thermal conductivity (up to 9%) with YAG addition.
  • Developed and validated a predictive model for emission spectra based on composite parameters.

Conclusions:

  • KSF/YAG composite phosphor ceramics are effective for generating high-quality warm white light.
  • The composites show potential for higher-drive LED applications due to enhanced thermal conductivity and reduced efficiency droop.
  • Tunability of emission spectra by adjusting material composition and structure offers design flexibility.