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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

1.0K
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
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Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

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Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
851
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

1.6K
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
1.6K
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

4.7K
The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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In Depth Analyses of LEDs by a Combination of X-ray Computed Tomography CT and Light Microscopy LM Correlated with Scanning Electron Microscopy SEM
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Spectral assemblage using light emitting diodes to obtain specified lighting characteristics.

Jiang Lei, Gu Xin, Muqing Liu

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    |January 22, 2015
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    Summary

    This study explores spectral assemblage using Light Emitting Diodes (LEDs), optimizing light source arrangements for high luminous efficacy across various color temperatures and rendering indexes. The findings detail energy distributions for advanced lighting applications.

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    Area of Science:

    • Optics and Photonics
    • Solid-state lighting technology

    Background:

    • Light Emitting Diodes (LEDs) are advanced light sources with tunable spectral properties.
    • LEDs offer advantages in applications requiring precise light control, such as dimming and spectral customization.

    Purpose of the Study:

    • To investigate spectral assemblage techniques using LEDs.
    • To determine optimal LED arrangements for specific lighting requirements.
    • To maximize luminous efficacy for various correlated color temperatures (CCT) and color-rendering indexes (CRI).

    Main Methods:

    • Utilized an exhaustive and genetic algorithm to explore spectral arrangements.
    • Covered the visible spectrum from 400 to 700 nm.
    • Calculated maximum luminous efficacy for defined CCT and CRI targets.

    Main Results:

    • Identified valid spectral arrangements for LED light sources.
    • Determined peak luminous efficacy values for diverse lighting scenarios.
    • Presented the energy distribution corresponding to optimal spectral configurations.

    Conclusions:

    • Spectral assemblage with LEDs enables efficient and customizable light sources.
    • The study provides a framework for designing high-performance LED lighting systems.
    • Optimized energy distributions are crucial for achieving desired luminous efficacy and color quality.