Light-emitting-diode Lambertian light sources as low-radiant-flux standards applicable to quantitative luminescence-intensity imaging

Planar-type Lambertian light-emitting diodes (LEDs) with a circular aperture of several tens of μ m to a few mm in diameter were developed for use as radiant-flux standard light sources, which have been in strong demand for applications such as quantitative or absolute intensity measurements of weak...

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Bibliographic Details
Published in:Review of scientific instruments 2017-09, Vol.88 (9), p.093704-093704
Main Authors: Yoshita, Masahiro, Kubota, Hidehiro, Shimogawara, Masahiro, Mori, Kaneo, Ohmiya, Yoshihiro, Akiyama, Hidefumi
Format: Article
Language:English
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Summary:Planar-type Lambertian light-emitting diodes (LEDs) with a circular aperture of several tens of μ m to a few mm in diameter were developed for use as radiant-flux standard light sources, which have been in strong demand for applications such as quantitative or absolute intensity measurements of weak luminescence from solid-state materials and devices. Via pulse-width modulation, time-averaged emission intensity of the LED devices was controlled linearly to cover a wide dynamic range of about nine orders of magnitude, from 10 μ W down to 10 fW. The developed planar LED devices were applied as the radiant-flux standards to quantitative measurements and analyses of photoluminescence (PL) intensity and PL quantum efficiency of a GaAs quantum-well sample. The results demonstrated the utility and applicability of the LED standards in quantitative luminescence-intensity measurements in Lambertian-type low radiant-flux level sources.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5001733