2021
DOI: 10.3390/ma15010013
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Review of Low-Frequency Noise Properties of High-Power White LEDs during Long-Term Aging

Abstract: Low-frequency noise investigation is a highly sensitive and very informative method for characterization of white nitride-based light-emitting diodes (LEDs) as well as for the evaluation of their degradation. We present a review of quality and reliability investigations of high-power (1 W and 3 W) white light-emitting diodes during long-term aging at the maximum permissible forward current at room temperature. The research was centered on the investigation of blue InGaN and AlInGaN quantum wells (QWs) LEDs cov… Show more

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“…In semiconductors, including light-emitting diodes, four main types of noise can be identified: thermal (Johnson-Nyquist), shot (Poisson), generation-recombination (GR), and pink (or flicker noise, or 1/f ) noise. 3 Thermal noise is caused by the equilibrium thermal motion, and random and independent events of charge carriers crossing a potential barrier lead to the occurrence of shot noise. Both thermal and shot noise are characterized by a white spectrum, meaning they do not depend on frequency.…”
Section: Types Of Noise In Light-emitting Diodesmentioning
confidence: 99%
“…In semiconductors, including light-emitting diodes, four main types of noise can be identified: thermal (Johnson-Nyquist), shot (Poisson), generation-recombination (GR), and pink (or flicker noise, or 1/f ) noise. 3 Thermal noise is caused by the equilibrium thermal motion, and random and independent events of charge carriers crossing a potential barrier lead to the occurrence of shot noise. Both thermal and shot noise are characterized by a white spectrum, meaning they do not depend on frequency.…”
Section: Types Of Noise In Light-emitting Diodesmentioning
confidence: 99%