Resumo

GUERRA BLANCO, Ernesto Alejandro; FERNANDEZ LABRADA, Diego de los Angeles  e  VIDALES-BASURTO, Claudia Andrea. Archimedean copulas for reliability evaluation of LEDs used in lighting. Energética [online]. 2023, vol.44, n.2, pp. 94-101.  Epub 02-Ago-2023. ISSN 1815-5901.

Due to the complexity of LEDs failure modes and mechanisms, its reliability is a key research issue. Existing methods for LEDs reliability prediction only consider one failure mode: lumen degradation or color change; however, working with only one failure mode could limit the scope of the analysis. This paper shows the procedure for obtaining reliability models of white LEDs through of bivariate copulas, from ''times to failure'' taken from the consulted literature. The results obtained show that the best fitting copula model, according to the Akaike Information Criterion (AIC) is the Clayton copula, whose Kendall correlation coefficient indicates that the characteristic parameters ''lumen maintenance” and ''variation of chromaticity coordinates'' are not completely independent.

Palavras-chave : white LEDs; reliability analysis; bivariate copulas; AIC; lifetime.

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