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Proceedings Paper

A new approach to preparation of standard LEDs for luminous intensity and flux measurement of LEDs
Author(s): Seung-Nam Park; Seongchong Park; Dong-Hoon Lee
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Paper Abstract

This work presents an alternative approach for preparing photometric standard LEDs, which is based on a novel functional seasoning method. The main idea of our seasoning method is simultaneously monitoring the light output and the junction voltage to obtain quantitative information on the temperature dependence and the aging effect of the LED emission. We suggested a general model describing the seasoning process by taking junction temperature variation and aging effect into account and implemented a fully automated seasoning facility, which is capable of seasoning 12 LEDs at the same time. By independent measurements of the temperature dependence, we confirmed the discrepancy of the theoretical model to be less than 0.5 % and evaluate the uncertainty contribution of the functional seasoning to be less than 0.5 % for all the seasoned samples. To demonstrate assigning the reference value to a standard LED, the CIE averaged LED intensity (ALI) of the seasoned LEDs was measured with a spectroradiometer-based instrument and the measurement uncertainty was analyzed. The expanded uncertainty of the standard LED prepared by the new approach amounts to be 4 % ~ 5 % (k=2) depending on color without correction of spectral stray light in the spectroradiometer.

Paper Details

Date Published: 21 September 2006
PDF: 7 pages
Proc. SPIE 6355, Advanced LEDs for Solid State Lighting, 63550G (21 September 2006); doi: 10.1117/12.692741
Show Author Affiliations
Seung-Nam Park, Korea Research Institute of Standards and Science (South Korea)
Seongchong Park, Korea Research Institute of Standards and Science (South Korea)
Dong-Hoon Lee, Korea Research Institute of Standards and Science (South Korea)


Published in SPIE Proceedings Vol. 6355:
Advanced LEDs for Solid State Lighting
Chang-Hee Hong; Tsunemasa Taguchi; Jung Han; Lianghui Chen, Editor(s)

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