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首页> 外文期刊>Talanta: The International Journal of Pure and Applied Analytical Chemistry >Absorbance measurements with light-emitting diodes as sources: Silicon photodiodes or light-emitting diodes as detectors?
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Absorbance measurements with light-emitting diodes as sources: Silicon photodiodes or light-emitting diodes as detectors?

机译：使用发光二极管作为源的吸光度测量：硅光电二极管或发光二极管作为检测器？

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摘要

Light-emitting diodes may also serve as light detectors, and the combination of two of these devices, one serving as light source, the other for detection, has been reported repeatedly for use in analytical photometry. A comparative study of the performance of light-emitting diodes in this role and that of a standard photodiode is reported herein. The spectral sensitivities of the light-emitting diodes were found to be as narrow as their emission bands, but shifted to shorter wavelengths, so that the spectral overlaps between emission and sensitivity of the same devices are very limited. The photocurrents of the light-emitting diodes were found to be about ten times lower than those of the photodiode. In the discharge mode (the time for discharge of the p-junction by the photocurrent is measured) as well as the photovoltaic mode, both of which had previously been reported for light-emitting diodes used as detectors in photometric devices, the performance of a light-emitting diode was on a level that is adequate for many analytical purposes, but the photodiode generally gave better precision and the signals showed faster settling times.
机译：发光二极管也可以用作光检测器，并且已经重复报道了这些装置中的两个的组合，一个用作光源，另一个用作检测，已用于分析测光法。本文报道了在这种作用下发光二极管的性能与标准光电二极管的性能的比较研究。发现发光二极管的光谱灵敏度与它们的发射带一样窄，但是转移到较短的波长，使得相同器件的发射和灵敏度之间的光谱重叠非常有限。发现发光二极管的光电流比光电二极管的光电流低大约十倍。在放电模式（通过光电流测量p / n结的放电时间）以及光伏模式下，这两种模式先前都曾报道过用作光度计检测器的发光二极管，发光二极管的发光二极管的水平足以满足许多分析目的，但是光电二极管通常具有更高的精度，并且信号显示出更快的建立时间。

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