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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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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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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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Low-energy Cathodoluminescence for OxyNitride Phosphors
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Laser-driven phosphor-converted white light source for solid-state illumination.

Anthony F George, Sara Al-waisawy, Jason T Wright

    Applied Optics
    |March 15, 2016
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    Summary
    This summary is machine-generated.

    This study introduces a novel solid-state luminaire using laser diodes for efficient white light. This laser-pumped technology offers improved energy efficiency and avoids light-emitting diode (LED) droop issues.

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    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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    Area of Science:

    • Solid-state lighting
    • Photonics and optoelectronics

    Background:

    • Growing demand for energy-efficient and high-quality lighting solutions.
    • Limitations of traditional light-emitting diodes (LEDs), such as efficiency droop.
    • Emerging interest in laser diodes as efficient pump sources for white light generation.

    Purpose of the Study:

    • To design and construct a domestic/office-type solid-state luminaire powered by a violet laser diode.
    • To investigate the performance and characteristics of a laser-pumped white light system.
    • To compare laser diode pumping with LED pumping for energy efficiency and longevity.

    Main Methods:

    • Utilized an integrated violet laser-diode module as the pump source.
    • Employed a trichromatic phosphor blend (rare-earth phosphors with europium) for downconversion.
    • Detailed mechanical and optical design of the reflector and phosphor plate.
    • Characterized pump light, downconverted light, chromaticity variations, and laser speckle effects.

    Main Results:

    • Demonstrated a functional solid-state luminaire driven by laser diode light.
    • Analyzed the optical and mechanical design parameters of the luminaire.
    • Investigated the impact of pump power on chromaticity coordinates and laser speckle.
    • Provided a comparative discussion on energy conversion efficiency and longevity.

    Conclusions:

    • Laser diode-pumped phosphors offer a promising alternative to LEDs, potentially overcoming droop limitations.
    • The developed luminaire design is suitable for domestic and office applications.
    • Further research into energy conversion efficiency and long-term stability is warranted for practical implementation.