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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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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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Variables Affecting Phosphorescence and Fluorescence01:26

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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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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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Rational Design of Nitride Phosphor-In-Glass with Robust Stability and Photoluminescence Performance.

Yuting Zhang1, Yuting Ye1, Guoying Zhao1

  • 1School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, PR China.

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Researchers developed a novel telluride glass phosphor-in-glass, enhancing stability for red nitride phosphors. This material maintains high quantum efficiency and enables precise color tuning for advanced white light-emitting diodes.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Optoelectronics

Background:

  • Phosphor-in-glass (PiG) composites offer combined luminous efficiency and thermal stability.
  • Red nitride phosphors are crucial for high-quality lighting but are structurally unstable during glass synthesis.
  • Developing a compatible glass matrix is key to preserving phosphor performance in PiG.

Purpose of the Study:

  • To create a stable glass matrix for red nitride phosphors.
  • To enhance photon utilization and thermal stability in PiG devices.
  • To achieve high-performance white light-emitting diodes (LEDs) with precise color tuning.

Main Methods:

  • Devised a telluride glass matrix with a refractive index matched to nitride phosphors.
  • Utilized a lower glass-transition temperature to protect phosphor particles during high-temperature processing.
  • Fabricated and characterized phosphor-in-glass composites and assembled white LED modules.

Main Results:

  • The telluride glass exhibited a refractive index (RI = 2.15@615 nm) closely matching nitride phosphor (∼2.19).
  • Phosphor-in-glass retained 93% of the original phosphor's quantum efficiency.
  • The assembled white LED module achieved a color rendering index of 93.7, luminous efficacy of 80.4 lm/W, and correlated color temperature of 5850 K.

Conclusions:

  • The developed telluride glass matrix effectively stabilizes red nitride phosphors in PiG composites.
  • This approach significantly improves photon utilization and thermal stability for high-quality illumination.
  • The results demonstrate potential for advancing inorganic packaging and high-performance white LEDs.