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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...
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.
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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Related Experiment Video

Updated: Jun 5, 2026

In Depth Analyses of LEDs by a Combination of X-ray Computed Tomography (CT) and Light Microscopy (LM) Correlated with Scanning Electron Microscopy (SEM)
10:42

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Published on: June 16, 2016

Phosphor-converted LED modeling by bidirectional photometric data.

Chien-Hsiang Hung1, Chung-Hao Tien

  • 1Department of Photonics, Institute of Electro-optical Engineering, National Chiao Tung University, Hsinchu, Taiwan.

Optics Express
|December 18, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to analyze how phosphors in light-emitting diodes convert and scatter light. The findings improve understanding of phosphor characteristics for advanced white lighting applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Phosphor-converted light-emitting diodes (pcLEDs) are crucial for modern lighting.
  • The optical behavior of phosphors involves complex light conversion and scattering.
  • Understanding these mechanisms is key to optimizing pcLED performance.

Purpose of the Study:

  • To develop a methodology for characterizing phosphor conversion and scattering.
  • To investigate the influence of illumination and viewing geometries.
  • To validate the proposed characterization model using a commercial pcLED.

Main Methods:

  • Measurement of bidirectional scattering distribution functions (BSDFs).
  • Characterization of phosphor layer mechanisms in pcLEDs.
  • Utilizing a commercially available pcLED with conformal phosphor coating for validation.

Main Results:

  • The proposed methodology effectively characterizes phosphor conversion and scattering.
  • BSDF measurements provide insights into the optical behavior.
  • The model shows close agreement with experimental measurements.

Conclusions:

  • The developed characterization method offers new perspectives for phosphor-based technologies.
  • This work enhances the understanding of light interaction within pcLEDs.
  • The findings are applicable to the design of advanced white lighting solutions.