The Influence of Junction Temperature Variation of LED on the Lifetime Estimation During Accelerated Aging Test

Wang, Xiaoxun; Lei, Jing; Wang, Yao; Gao, Qun; Sun, Quan

doi:10.1109/access.2018.2885578

Cited by 17 publications

(10 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[15] performs accelerated degradation tests to establish a thermal stress limit for LEDs such that the accelerated conditions depict the degradation of LEDs for practical conditions. The thermal stress limit is established to be approx 100 • C. [16] performs experiments on seven different types of LED lamps to determine the effect of junction temperature on the performance of the LEDs during step stress accelerated degradation testing. Junction temperature is related to the ratio of white light power to blue light power.…”

Section: Introductionmentioning

confidence: 99%

Accelerated Testing Based Lifetime Performance Evaluation of LEDs in LED Luminaire Systems

Padmasali

Kini²

2021

IEEE Access

View full text Add to dashboard Cite

LED luminaires have taken over other traditional lighting solutions in all possible lighting applications due to advances such as high lifetime, power efficiency, adaptability in size, shape, and different color generations. The reliability of the LED luminaire as a system was determined by the lifetime performance of the driver electronics. The advancements in power electronics led to more reliable components and products. The LED luminaire's reliability is determined by the light output and color appearance quality, and quantity. The importance of single LEDs performance in the LED luminaires is most recently realized and needs to be explored. The manuscript presents the analyses of the lumen output and Duv based life estimation, the variations in color appearance in terms of xy chromaticity, and spectral power distribution of two luminaires having same electrical and optical specifications employing different type of LEDs subjected to different accelerated operating conditions. The results identify the predominant failure indicators for lumen and color changes, and show that LED physics & device packaging also play a significant role in the reliability study of an LED luminaire. The results of the manuscript are helpful for LED luminaire manufacturers to enhance the lifetime of LED luminaires by suitable moderation in the LED package design in terms of lumen output and color quality maintenance as per specific application requirements.

show abstract

Section: Introductionmentioning

confidence: 99%

Accelerated Testing Based Lifetime Performance Evaluation of LEDs in LED Luminaire Systems

Padmasali

Kini²

2021

IEEE Access

View full text Add to dashboard Cite

show abstract

“…In addition, in the LED light, the intensity of the light source decreases in inverse proportion to the turn-on time, which is called LED aging [21][22][23]. The most representative cause of LED aging is the internal LED temperature [24]. As the internal temperature of the LED increases, the intensity of the light source decreases and reaches a constant output after a long period of time [25].…”

Section: Introductionmentioning

confidence: 99%

LED Module Calibration Strategy to Improve Measurement Accuracy of TRO Concentration

Lee¹,

Kim

et al. 2021

Electronics

View full text Add to dashboard Cite

In order to limit various alien species by ballast water, electrolysis of ballast water is used to sterilize microorganisms. In this process, total residual oxidizer (TRO) is produced, and it is necessary to measure the precise TRO concentration to prevent excessive disinfection by-products and limit emissions. In this TRO concentration measurement system, a white LED module and RGB sensor are used to measure the absorbance through the DPD colorimetric method. The intensity of LED light has a little error for each LED module. In addition, the effect of LED aging in which the intensity of the light source decreases with the elapsed time. For this reason, the TRO concentration measurement error increases. To solve this problem, we propose an LED module calibration algorithm by current PI control and an optimal LED operation time derivation to reduce the effect of LED aging. A large number of LED modules were applied to various seawater environments. In the conventional method, the measurement accuracy and precision of the average TRO concentration were 6.56% and 9.54%, respectively, and measurement accuracy and precision through the proposed algorithm and LED aging optimization were greatly reduced to 0.10% and 0.85%, respectively. In addition, we derived that LED aging was minimized when the measurement time of LED light was 1 s and the turn-off time of the LED light was 10 s. Through these experimental results, we confirmed that the non-uniform LED light is improved by the proposed algorithm. Furthermore, the standard values for TRO concentration measurement (accuracy: less than 5%, precision: less than 2%) were satisfied.

show abstract

“…However, during package and application of PC white LEDs, the thermal effect should be a critical issue to be concerned, since GaN chips and phosphor materials used are both thermal sensitive. For PC white LEDs, only about 30% of input electric power is proved to be converted into light energy, while the rest is dissipated as heat which has been found to negatively affect optical performances [5], [6]. Therefore, the thermal management of PC white LEDs is important for lighting quality improving and energy saving.…”

Section: Introductionmentioning

confidence: 99%

Electrical and Thermal Effects of Tunable LED Systems on Lighting and Non-Visual Biological Characteristics

et al. 2020

View full text Add to dashboard Cite

The color, electrical, optical and thermal properties of light-emitting diode (LED) systems are highly dependent on one another. This paper proposes an analysis model that links the optical power, correlated color temperature (CCT), and circadian action factor (CAF) together with the electrical and thermal effects of phosphor-converted LEDs. The proposed model applies to tunable white LED systems with various color temperatures of LEDs whose spectral power distribution (SPD) can be individually controlled. The total optical power is due to the combined emitted optical power of both LEDs, the overall CCT is built upon a non-linear empirical LED model, and the overall CAF is quantified based on an extended Gaussian SPD model. The proposed prediction model consists a series of optical and chromatic evaluation, with which it is simple for LED system designers to comply. In model verification, the bi-color white LED source made up of a warm color LED (2700 K) and a cool color LED (7600 K) is adopted, with good agreement between the calculated and experimental results.

show abstract

The Influence of Junction Temperature Variation of LED on the Lifetime Estimation During Accelerated Aging Test

Cited by 17 publications

References 23 publications

Accelerated Testing Based Lifetime Performance Evaluation of LEDs in LED Luminaire Systems

Accelerated Testing Based Lifetime Performance Evaluation of LEDs in LED Luminaire Systems

LED Module Calibration Strategy to Improve Measurement Accuracy of TRO Concentration

Electrical and Thermal Effects of Tunable LED Systems on Lighting and Non-Visual Biological Characteristics

Contact Info

Product

Resources

About