Lifetime Analysis of Commercial 3 W UV-A LED

Orobón, Francisco José Arqués; Vázquez, M.; Núñez, Neftalí

doi:10.3390/cryst10121083

Cited by 8 publications

(7 citation statements)

References 44 publications

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“…UV-7 was operated at an If value that was the lowest percentage of the maximum rated current for any of the products in the test matrix, but was operated at the same overall current as other comparable high-powered UV-C LEDs (e.g., UV-5, UV-6). Current densities used during RTOL-2 were generally lower than those found in most literature studies [14,15,17,20].…”

Section: Rtol-2mentioning

confidence: 53%

“…Although previous studies of the reliability of UV LEDs are more limited in scope than this report, there have been notable studies spanning the UV-A [12][13][14], UV-B [15,16], and UV-C [10, [16][17][18][19][20][21][22] bands. The forward current (If) densities in these studies ranged from 27 amps per square centimeter (A/cm 2 ) to 140 A/cm 2 .…”

Section: Previous Studies About Uv Led Reliabilitymentioning

confidence: 96%

“…Several general trends have emerged from these studies, and perhaps the most significant finding involved increased leakage currents at voltages well below the threshold voltage (Vth). The parasitic shunt circuits that give rise to such low voltage leakage currents appeared to reduce active carrier concentration through modifications of Shockley-Read-Hall (SRH) mechanisms and are thought to be directly tied to aging-induced reductions of emissions from UV-A, UV-B, and UV-C devices [10, [12][13][14][15][16][17][18][19][20]22]. Evidence for parallel shunt circuits is provided in the current-voltage (I-V) measurements of an LED by a growing feature at voltages below Vth.…”

Section: Previous Studies About Uv Led Reliabilitymentioning

confidence: 99%

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Operating Lifetime Study of Ultraviolet (UV) Light-Emitting Diode (LED) Products

Davis

Rountree

Pope

et al. 2022

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Light-emitting diodes (LEDs) can emit radiation that spans the range from near infrared (IR) to all three bands of ultraviolet (UV) radiation: UV-A, UV-B, and UV-C. This report focuses on LEDs that emit in one of the three UV bands because they have the potential to displace lowpressure mercury vapor (LPMV) lamps in a variety of industrial processes, including ink and adhesive curing, medical procedures, and germicidal disinfection. However, before emerging UV LED technologies can displace LPMV lamps, the efficiency and reliability of these sources must meet the user's expectations in each application. An earlier report focused on the construction and initial performance of commercial UV LED products in radiometric and current-voltage (I-V) tests [1]. This report focuses on the long-term performance and reliability of the same set of commercial products. The intent of this report is to provide to the lighting industry a benchmark of the state of UV LEDs as of mid-2021 when these products were purchased. Understanding the failure modes and failure rates of UV LEDs is important in improving UV product reliability at the LED, lamp, and luminaire level and is critical to developing products with higher efficiency, lower carbon footprint, and significantly reduced environmental impact than LPMV lamps.Operating Lifetime Study of Ultraviolet (UV) Light-Emitting Diode (LED) Products viii maintenance [RFM] was 0.50 or lower). Four products (i.e., UV-3, UV-5, UV-9, and UV-11) did not experience any failures during RTOL-1, but the other nine products had failure rates ranging from 10% to 100%. The most common failure mode was a parametric failure, which accounted for 50 failures during the test. Only seven DUTs failed abruptly, and four out of these seven devices were UV-2 DUTs. These findings demonstrate that there is a wide range of reliability in commercially available UV LED products.Different DUTs of the 13 UV LED products were divided into two groups for RTOL-2 based on their power rating. Group-A, which had If values less than 55 milliampere (mA), was operated for 2,500 hrs during RTOL-2, whereas Group-B, which had If values greater than 100 mA, was operated for 3,000 hrs during RTOL-2. Even though product operation times were longer in RTOL-2 compared with RTOL-1, the cumulative failure rate was lower, as might be expected for the milder stress conditions (i.e., lower If values). A total of 32 failures occurred during RTOL-2 (which is 25% of the total product population): 11 abrupt failures and 21 parametric failures. This finding corresponds to a cumulative failure rate of 25%. Most of the failures during RTOL-2 were concentrated in fewer products; this observation was in contrast to findings from RTOL-1, during which failures were more widespread. For example, during RTOL-2, 7 abrupt failures occurred in the UV-2 DUTs and a greater than 50% parametric failure rate was measured for the UV-8 and UV-14 DUTs. These three products accounted for 22 out of the 32 failures recorded in RTOL-2.Based on this work and combine...

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Section: Rtol-2mentioning

confidence: 53%

Section: Previous Studies About Uv Led Reliabilitymentioning

confidence: 96%

Section: Previous Studies About Uv Led Reliabilitymentioning

confidence: 99%

See 1 more Smart Citation

Operating Lifetime Study of Ultraviolet (UV) Light-Emitting Diode (LED) Products

Davis

Rountree

Pope

et al. 2022

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“…The heat generated increases the LED junction temperature, reducing the light output, which is a major factor in the sterilization effect. Therefore, it is important to properly manage the operating temperature generated by the UVC LED irradiation ( Arques-Orobon et al, 2020 ).…”

Section: Resultsmentioning

confidence: 99%

Effect of Ultraviolet-C Light-Emitting Diode Treatment on Disinfection of Norovirus in Processing Water for Reuse of Brine Water

Yoon¹,

Ha²,

Park³

et al. 2022

Front. Microbiol.

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Processes in the food industry that use large amounts of water have been an important cause of waterborne disease outbreaks, as they expose individuals to risks for waterborne disease transmission. Developing technologies to ensure the hygiene and safety of food-processing steps is an urgent concern from an economic perspective. Furthermore, economic benefits can be derived if the processed water can be reused under microbiologically safe conditions. Among the major manufacturing processes in the kimchi industry, the brining process for salted kimchi cabbages requires a considerable amount of brine (approximately 2,000–2,500 l/1,000 kg of raw cabbage). The aim of this study was to establish virucidal conditions with ultraviolet-C light-emitting diodes (UVC LEDs) that can ensure the microbiological safety of brine water samples with various turbidities for reuse after disinfection. For quantitative analysis, first of all, magnetic bead separation (MBS) technique was used to capture and recover the human norovirus (HuNoV) virus particles; propidium monoazide (PMA) combined with RT-qPCR (PMA-RT-qPCR) was subsequently used to selectively detect infectious norovirus. Overall, as the turbidity of the brine water samples increased, the reduction in the HuNoV genogroup II genotype 4 (HuNoV GII.4) levels by UVC LED disinfection decreased. The derived inactivation rate constant (kinac) and inactivation curves (calculated using the log-linear model) were studied as a function of turbidity based on the exponential one-phase inactivation kinetics of HuNoV. Using an impeller system set at 100 rotations/min (rpm) with an eight-nephelometric turbidity unit (NTU) sample (the lowest turbidity studied), the kinact based on the levels of viral genomic RNA concentrations was approximately 2.15-fold higher than that observed without rotation (0 rpm). Moreover, the kinact increased 1.69-fold with a 56-NTU sample (the highest turbidity studied) when the impeller system was set at 100 rpm. UVC LED treatment decreased the HuNoV GII.4 population more effectively in conjunction with the impeller system (100 rpm) than without the impeller system. Our novel findings and model provide fundamental and scientific data that may help reuse brine water and ensure its microbiological safety through disinfection. Our study highlights the benefits of UVC LED treatment in successfully eliminating waterborne viruses in a prompt, resistance-reducing, and energy-efficient approach at the laboratory scale, which lays the foundation for future plant-scale studies of UVC LED-disinfection systems.

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“…Unlike the numerous publications analyzing the degradation behavior of blue and phosphor-converted LEDs, only a few papers were published regarding the degradation mechanisms and behavior of In 1−x Ga x N-based UV-A LEDs [13], [15], [16], [17], [18], [19], [20], [21]. Compared directly with emitters of the blue spectral range, a significantly shorter lifetime of ultraviolet or near-ultraviolet structures can be observed [3].…”

Section: Introductionmentioning

confidence: 99%

Lifetime Prediction of Current-and Temperature-Induced Degradation in Silicone-Encapsulated 365 nm High-Power Light-Emitting Diodes

et al. 2023

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We report on the degradation mechanisms and dynamics of silicone encapsulated ultraviolet A (UV-A) high-power light-emitting diodes (LEDs), with a peak wavelength of 365 nm. The stress tests were carried out for a period of 8665 hours with forward currents between 350 mA and 700 mA and junction temperatures up to 132 • C. Depending on stress condition, a significant decrease in optical power could be observed, being accelerated with higher operating conditions. Devices stressed at a case temperature of 55 • C indicate a decrease in radiant flux between 10 -40 % varying with measurement current, whereas samples stressed at higher case temperatures exhibit crack formation in the silicone encapsulant accompanied by electromigration shorting the active region. The analyzed current and temperature dependency of the degradation mechanisms allows to propose a degradation model to determine the device lifetime at different operating parameters. Additional stress test data collected at different aging conditions is used to validate the model's lifetime predictions.

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Lifetime Analysis of Commercial 3 W UV-A LED

Cited by 8 publications

References 44 publications

Operating Lifetime Study of Ultraviolet (UV) Light-Emitting Diode (LED) Products

Operating Lifetime Study of Ultraviolet (UV) Light-Emitting Diode (LED) Products

Effect of Ultraviolet-C Light-Emitting Diode Treatment on Disinfection of Norovirus in Processing Water for Reuse of Brine Water

Lifetime Prediction of Current-and Temperature-Induced Degradation in Silicone-Encapsulated 365 nm High-Power Light-Emitting Diodes

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