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Related Concept Videos

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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Photoluminescence: Applications01:14

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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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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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Related Experiment Video

Updated: Apr 12, 2026

Low-energy Cathodoluminescence for OxyNitride Phosphors
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Red-blue-green solid state light sources using a narrow line-width green phosphor.

A Liu, A Khanna, P S Dutta

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    |May 14, 2015
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    Summary
    This summary is machine-generated.

    Using a narrow green phosphor aligned with human eye sensitivity boosts luminous efficacy of radiation (LER) by 20 lm/W for Red-Green-Blue (RGB) emitters. This enhances energy efficiency in lighting applications.

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    Area of Science:

    • Solid-state lighting
    • Photonic materials science
    • Human visual perception

    Background:

    • Traditional Red-Green-Blue (RGB) emitters often utilize phosphors with broad emission spectra.
    • This broadness can lead to inefficiencies as emitted light may not perfectly align with peak human visual sensitivity.
    • Optimizing luminous efficacy of radiation (LER) is crucial for energy-efficient lighting solutions.

    Purpose of the Study:

    • To investigate the impact of a narrow line-width green phosphor, precisely tuned to the human eye's peak sensitivity, on the LER of RGB emitters.
    • To explore the potential for further LER enhancement by balancing narrow-band green emission with conventional red and blue phosphors.
    • To identify suitable applications for these enhanced light sources.

    Main Methods:

    • Fabrication and characterization of a narrow line-width green phosphor.
    • Integration of this green phosphor with standard red and blue phosphors in RGB emitter systems.
    • Measurement and comparison of LER for the novel RGB system against traditional RGB sources.
    • Analysis of color quality metrics, including deviation from the Planckian locus.

    Main Results:

    • A significant improvement in LER of 20 lm/W was achieved compared to traditional RGB sources.
    • The narrow green phosphor, aligned with peak human eye sensitivity, was key to this improvement.
    • Trade-offs between LER and deviation from the Planckian locus were demonstrated by combining phosphors.
    • The developed light sources show potential for high energy efficiency and intensity.

    Conclusions:

    • Narrow line-width green phosphors aligned with human visual sensitivity offer substantial LER improvements for RGB emitters.
    • These phosphors enable high-efficiency, high-intensity lighting solutions suitable for applications where color quality can be slightly compromised.
    • Potential applications include automotive lighting, outdoor areas, industrial warehouses, and public transportation hubs.