A large-chip standard LED with superior long-term stability have been developed at NIST. The standard LED uses a large, specialty die rated for 50 W but is operated under 3 W to eliminate aging effect. The standard LED was seasoned for one year and measured for its long-term stability for three years. The measurement result shows that the long-term stability is on the level of 0.1 % in the three-year time. The LED can be used as a transfer standard for luminous intensity, luminance, and total luminous flux.
Proceeding of the 29th Quadrennial Session of the CIE
, Zhao, W.
and Miller, C.
STANDARD LEDS WITH SUPERIOR LONG-TERM STABILITY, Proceeding of the 29th Quadrennial Session of the CIE, Washington, DC, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=928008
(Accessed September 27, 2021)