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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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Fluorescence and Phosphorescence: Instrumentation01:25

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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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Flame Photometry: Lab01:16

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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Photoluminescence: Fluorescence and Phosphorescence01:23

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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.
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A Snapshot of 118 Solid State Lighting Testing Laboratories' Capabilities.

C Cameron Miller1, Hannah Hasting1, María E Nadal1

  • 1National Institute of Standards and Technology, 100 Bureau Drive, Stop 8442, Gaithersburg, MD 20899-8442.

Leukos
|April 15, 2024
PubMed
Summary

Proficiency testing for Solid-State Lighting (SSL) products revealed general accuracy in photometric and electrical measurements. However, RMS current measurements showed unexpected variability, prompting further investigation into testing methodologies.

Keywords:
LEDMeasurement Assurance ProgramProficiency TestingSolid State Lighting

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Area of Science:

  • Photometry and Radiometry
  • Solid-State Lighting Metrology
  • Electrical Measurements

Background:

  • The National Institute of Standards and Technology (NIST) established a Measurement Assurance Program (MAP) in 2010 for Solid-State Lighting (SSL) products.
  • The MAP program aimed to complement laboratory accreditation, ensuring measurement capabilities aligned with the growing SSL market.

Purpose of the Study:

  • To report the findings of the inaugural NIST MAP for SSL, assessing worldwide laboratory performance.
  • To analyze measurement data for photometric, colorimetric, and electrical quantities against NIST's reference values.

Main Methods:

  • 118 international laboratories participated in the first SSL MAP.
  • Statistical analysis was performed on measurements of photometric, colorimetric, and electrical quantities.
  • Fit parameters and discrepancies between laboratory and NIST measurements were evaluated.

Main Results:

  • Most laboratory results for total luminous flux and luminous efficacy were within +/- 4% of NIST measurements.
  • Significant discrepancies and outliers were observed in RMS current measurements, exceeding expectations.
  • Potential causes for RMS current variability include issues with 4-pole sockets and AC power supply sensitivity.

Conclusions:

  • Accredited laboratories generally demonstrate good capability in SSL photometric and electrical measurements.
  • Further research is needed to address the variability in RMS current measurements for SSL products.
  • NIST is conducting additional research to improve consistency in SSL measurement results within the testing community.