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Related Concept Videos

P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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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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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
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Light as Energy01:35

Light as Energy

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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.
Photons
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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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Smartphone-Driven Low-Power Light-Emitting Device.

Hea-Ja An1, Kyung-Won Kim1, Mun-Ho Ryu2,3

  • 1Department of Healthcare Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si 54896, Jeollabuk-do, Republic of Korea.

Journal of Healthcare Engineering
|October 26, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a smartphone-controlled LED device for color therapy, offering adjustable light intensity for alternative medicine applications. The device utilizes pulse width modulation (PWM) calibration for accurate light output.

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Area of Science:

  • Biomedical Engineering
  • Alternative Medicine
  • Photomedicine

Background:

  • Low-level light (laser) therapy (LLLT) research has predominantly used lasers.
  • Recent advancements show increased interest in using light-emitting diodes (LEDs) for LLLT.
  • Color therapy is an alternative medicine modality with growing interest.

Purpose of the Study:

  • To develop a smartphone-driven, low-power LED device for color therapy.
  • To enable precise control over light intensity and emission time.
  • To offer a portable and accessible alternative medicine tool.

Main Methods:

  • A smartphone application controls a device with a control unit and color probe via USB On-The-Go (OTG).
  • Pulse width modulation (PWM) is used for intensity control without feedback.
  • A calibration process measures intensity at 10% PWM intervals for linear correction.

Main Results:

  • The device successfully controls illumination intensity and emission time.
  • Linear calibration of PWM values ensures accurate light intensity output.
  • The developed device demonstrates potential for varied therapeutic applications.

Conclusions:

  • A novel smartphone-controlled LED device for color therapy has been successfully developed.
  • The device offers adjustable light intensity through calibrated PWM, enhancing its therapeutic utility.
  • This technology presents a promising, accessible tool for alternative medicine and photomedicine.