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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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Using electric appliances for a longer period of time consumes more electrical energy and results in a higher electric bill. The energy produced by the transfer of electrons from one point to another is known as electrical energy. If power is delivered at a constant rate, the electrical energy can be defined as the product of power used by the device for a period of time. The energy unit on electric bills is the kilowatt-hour, where one kilowatt-hour is equivalent to 3.6 × 106 joules.
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Light as Energy01:35

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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
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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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Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter
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[White organic light-emitting diodes applied for lighting technology].

Qing-Yu Huang, Su-Ling Zhao, Zheng Xu

    Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
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    White electroluminescent organic light-emitting devices (WOLEDS) offer a highly efficient, cost-effective solid-state lighting alternative to incandescent lamps. This review details WOLEDS principles, structures, and recent advancements in lighting technology.

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    Area of Science:

    • Solid-state lighting
    • Organic electronics
    • Materials science

    Context:

    • Lighting constitutes 22% of US building electricity consumption.
    • Inefficient incandescent lamps account for 40% of lighting energy use.
    • Growing demand for energy-efficient lighting solutions.

    Purpose:

    • To review the principles and common structures of WOLEDS.
    • To investigate the mechanisms of different WOLEDS structures.
    • To summarize key technologies and recent research progress in WOLEDS.

    Summary:

    • Discusses the fundamental principles behind white electroluminescent organic light-emitting devices (WOLEDS).
    • Explores various common WOLEDS structures and analyzes their operational mechanisms.
    • Highlights critical technologies and reviews the latest advancements in WOLEDS research and application.

    Impact:

    • WOLEDS present a promising next-generation solid-state lighting source.
    • Potential for significantly improved energy efficiency compared to incandescent lighting.
    • Offers advantages in low-cost, high-throughput manufacturability for lighting applications.