Degradation of AlInGaP red LEDs under drive current and temperature accelerated life tests

Vázquez, M.; Núñez, Neftalí; Nogueira, Eduardo; Borreguero, A.

doi:10.1016/j.microrel.2010.07.057

Cited by 43 publications

(28 citation statements)

References 18 publications

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“…8. This power luminosity evolution has been observed by other authors [16][17][18]. Related with failure analysis we have observed two types of failures: Both types of failures have been analyzed by means of microscopic optical inspection and I-V curves measurement.…”

Section: Failure Analysissupporting

confidence: 76%

Accelerated life test of high luminosity AlGaInP LEDs

Nogueira

Vázquez

Mateos

2012

Microelectronics Reliability

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Specific tests to assess reliability of high luminosity AllnGaP LED for outdoor applications are needed. In this paper tests to propose a model involving three parameters: temperature, humidity and current have been carried out. Temperature, humidity and current accelerated model has been proposed to evaluate the reliability of this type of LED. Degradation and catastrophic failure mechanisms have been analyzed. Finally we analyze the effect of serial resistance in power luminosity degradation.

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Section: Failure Analysissupporting

confidence: 76%

Accelerated life test of high luminosity AlGaInP LEDs

Nogueira

Vázquez

Mateos

2012

Microelectronics Reliability

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“…The nonmonotonous evolution of optical output and I -V characteristic of LEDs is a well-established fact and is usually attributed to the competition of negative and positive degradation modes [31]- [34]. Such a competition can be understood in terms of a multicomponent defect model [35], [36], which accounts for two recombinationenhanced processes: 1) the growth of nonradiative recombination defect complexes from finite resources of pre-existing defects that do not cause nonradiative recombination and 2) the effect of the annealing resulting in a reduction in the number of nonradiative recombination centers.…”

Section: Discussionmentioning

confidence: 99%

Effect of Aging on the Photoelectrical Properties of AlGaInP LEDs

Meškauskas

Dabašinskas

Žukauskas

2016

IEEE Trans. Electron Devices

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We report on the nonmonotonous variation of photoelectrical properties of commercial AlGaInP LEDs during the aging process. The light-generated current and short-circuit photocurrent were found to drop by the factors of 2 and 1.5, respectively, after about 3 h of aging at the rated forward current of 1400 mA with subsequent recovery and stabilization within ∼1000 h of aging. The temporal minima of photocurrents were accompanied by increased photoconductivity revealed from the negative differential photovoltage under modulated photoexcitation as well as by the minimum of optical output and the maximum of the ideality factor of the LEDs at low forward currents. The observed temporal variation of the photoelectrical properties was attributed to the interplay of recombinationenhanced growth and annealing of defects responsible for nonradiative recombination and photoconductivity in the active and cladding layers of the LEDs, respectively.

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“…In addition, the sensitivity of the resulting predictive models to wavelength drift was investigated, as LEDs are well known to be susceptible to drifts unless rigorously controlled. [10][11][12] Kiwifruit data set…”

Section: Introductionmentioning

confidence: 99%

An Optimised Six-Wavelength Model for Predicting Kiwifruit Dry Matter

Shafie

Künnemeyer

McGlone

et al. 2015

Journal of Near Infrared Spectroscopy

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Optimised wavelength selection is important to the development of new types of inexpensive and portable near infrared instruments that might be used on fruit in orchards. The use of discrete bandwidth devices, such as light-emitting diodes, requires preselection of a small number of discrete wavelengths. In this work, a kiwifruit data set consisting of 834 absorbance spectra and corresponding fruit dry-matter measurements, an important maturity indicator for kiwifruit, has been subjected to an exhaustive wavelength search to build optimal multiple linear regression models of up to seven wavelengths. Using a standard partial least-squares model as a benchmark, a six-wavelength model has been identified as an optimum, predicting kiwifruit dry matter with r 2 of 0.88 and root mean square error of prediction (RMSEP) of 1.22%. The sensitivity of the model to shifts in the key wavelengths was also evaluated, revealing that a 1 nm offset or a 0.25 nm random noise component would be enough to increase the RMSEP by around 0.04% in actual dry matter value or 3% in relative percentage terms.

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Degradation of AlInGaP red LEDs under drive current and temperature accelerated life tests

Cited by 43 publications

References 18 publications

Accelerated life test of high luminosity AlGaInP LEDs

Accelerated life test of high luminosity AlGaInP LEDs

Effect of Aging on the Photoelectrical Properties of AlGaInP LEDs

An Optimised Six-Wavelength Model for Predicting Kiwifruit Dry Matter

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