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Biasing of P-N Junction01:16

Biasing of P-N Junction

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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
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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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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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Related Experiment Video

Updated: Dec 24, 2025

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
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    Area of Science:

    • Ophthalmology
    • Photobiology
    • Public Health

    Background:

    • LED technology has advanced significantly, increasing efficiency and optical radiation emission.
    • The development of white and UV LEDs has led to widespread use in general lighting and consumer products.
    • Concerns exist regarding potential retinal cell damage from LED optical radiation, particularly blue and white light.

    Purpose of the Study:

    • To evaluate the safety of optical radiation emissions from light-emitting diodes (LEDs).
    • To assess the potential risks of LED exposure concerning human retinal health.
    • To review current research on LED-related optical radiation effects.

    Main Methods:

    • Review of in vitro and animal studies on LED-induced retinal damage.
    • Analysis of epidemiological studies linking light exposure to age-related macular degeneration (AMD).
    • Evaluation of existing safety standards for light sources.

    Main Results:

    • In vitro and animal studies suggest potential retinal damage from high irradiance/long exposure to blue/white LEDs, but direct extrapolation to humans is limited.
    • Acute retinal damage in humans from typical blue or white LED exposure has not been demonstrated.
    • Adverse health effects from LEDs are primarily linked to temporal light modulation (flicker) and glare, not direct retinal damage.

    Conclusions:

    • Current evidence does not support acute retinal damage from typical human exposure to blue or white LEDs.
    • Potential long-term effects, such as age-related macular degeneration (AMD), warrant continued investigation, drawing parallels with sunlight exposure.
    • Established safety standards for lamps, not lasers, should be applied for evaluating LED optical radiation safety; further research on emerging technologies is necessary.