Thermal degradation kinetics of LED lamps in step-up-stress and step-down-stress accelerated degradation testing

Cai, Miao; Yang, Daoguo; Zheng, Jianna; Mo, Yuezhu; Huang, Jianlin; Xu, Jiwen; Chen, Wenbin; Zhang, Guoqi; Chen, Xianping

doi:10.1016/j.applthermaleng.2016.07.065

Cited by 20 publications

(4 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several highly accelerated degradation tests are analyzed under different high levels of temperature and humidity. The thermal degradation kinetics of LED lamps as a system is studied in [12] using step-down and step-up stress accelerated degradation test(ADT) to compare the decay mechanisms due to different thermal stress loads in both experiments. The results suggest that the LED package and phosphor play a significant role in the degradation of the entire LED system.…”

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

“…Studies on accelerated life testing can be divided into several main directions: developing hypotheses and statistical models necessary for estimating reliability indicators and confidence intervals [3]; optimization of models and accelerated test plans [4][5][6]; accelerated fatigue tests used on different industrial materials and products [7][8][9][10][11][12]; and the extension of the scope of application of accelerated testing techniques on various industrial products [13][14][15][16][17]. The extremely varied and complex stresses applied to the aerospace components have led to experimental studies, in order to ensure the proper functioning and the required reliability under maximum stress regime, at a minimum material and labour use.…”

Section: Introductionmentioning

confidence: 99%

Reliability and Lifetime Assessment of Glider Wing’s Composite Spar through Accelerated Fatigue Life Testing

2020

View full text Add to dashboard Cite

The evaluation of the reliability and the lifetime of aerospace components has become an important segment of the design stage. The aeronautical components are subjected to complex, rigorous tests and have a long test life. The main goal in the field of aviation is to have components with high reliability and quality and to meet the mandatory requirements and regulations. The spars are stiffening components positioned along the wing and which take up most of the load and are tested for fatigue over a long period of time. The spar which was analysed in this study has a sandwich structure with GFRP (glass fiber reinforced plastic) skin and foam core. In this paper, the performances in the static and dynamic conditions of the GFRP-foam sandwich structures cut out of the composite spar of a glider were analysed. Additionally, using accelerated techniques based on the three-point fatigue bending test, the main reliability indicators of the GFRP-foam sandwich structures were determined. Using the statistical processing of the experimental data and the Inverse Power Law–Weibull acceleration model, the mean number of cycles to failure, in normal testing conditions of the GFRP-foam specimens was determined, with a value of 102,814. Using the accelerated testing techniques of the GFRP-foam sandwich structures an important decrease of the test time (8.43 times) was obtained.

show abstract

“…To solve this problem, the SSADT technique can be regarded as one effective alternatives, since it combines the effects of multiple stress levels in a single test. The SSADT test has been already successfully employed in several electronics and LEDs for lifetime predictions such as by He [21], Cai [22,23], Qian [24], Wang [25], Benavides [26], Tseng [27], Hu [28], etc. However, applications of using SSADT in UV LEDs are rarely found in literature.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Step-Stress Accelerated Degradation Test Strategy for Ultraviolet Light Emitting Diodes

et al. 2019

View full text Add to dashboard Cite

III-nitride-based ultraviolet light emitting diode (UV LED) has numerous attractive applications in air and water purification, UV photolithography, and in situ activation of drugs through optical stimulus, solid state lighting, polymer curing, and laser surgery. However, the unclear failure mechanisms and uncertainty reliability have limited its application. Therefore, a design of an appropriate reliability test plan for UV LEDs has become extremely urgent. Compared to traditional reliability tests recommended in LED lighting industry, the step-stress accelerated degradation test (SSADT) is more cost-effective and time-effective. This paper compares three SSADT testing plans with temperature and driving currents as stepwise increasing loads to determine an appropriate test strategy for UV LEDs. The study shows that: (1) the failure mechanisms among different SSADT tests seem to be very different, since the driving current determines the failure mechanisms of UV LEDs more sensitively, and (2) the stepped temperature accelerated degradation test with an appropriate current is recommended for UV LEDs.

show abstract

Thermal degradation kinetics of LED lamps in step-up-stress and step-down-stress accelerated degradation testing

Cited by 20 publications

References 28 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

Reliability and Lifetime Assessment of Glider Wing’s Composite Spar through Accelerated Fatigue Life Testing

Investigation of Step-Stress Accelerated Degradation Test Strategy for Ultraviolet Light Emitting Diodes

Contact Info

Product

Resources

About