High power deep UV-LEDs for analytical optical instrumentation

Li, Yan; Dvorak, M.W.; Nesterenko, Pavel N.; Nuchtavorn, Nantana; Macka, Mirek

doi:10.1016/j.snb.2017.08.085

Cited by 28 publications

(19 citation statements)

References 34 publications

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“…A flow-focusing microfluidic device, consisting of double cross-junctions, for the high-throughput production of monodisperse water-in-oil-in-water (W/O/W) emulsions was described. [84] Both the sizes and the number of inner droplets are all controllable for the generated W/O/W emulsions.…”

Section: Flow-focusing Devices For the Fabrication Of Dropletsmentioning

confidence: 99%

Microfluidics for Biosynthesizing: from Droplets and Vesicles to Artificial Cells

Xie

Xiong

et al. 2019

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Fabrication of artificial biomimetic materials has attracted abundant attention. As one of the subcategories of biomimetic materials, artificial cells are highly significant for multiple disciplines and their synthesis has been intensively pursued. In order to manufacture robust “alive” artificial cells with high throughput, easy operation, and precise control, flexible microfluidic techniques are widely utilized. Herein, recent advances in microfluidic‐based methods for the synthesis of droplets, vesicles, and artificial cells are summarized. First, the advances of droplet fabrication and manipulation on the T‐junction, flow‐focusing, and coflowing microfluidic devices are discussed. Then, the formation of unicompartmental and multicompartmental vesicles based on microfluidics are summarized. Furthermore, the engineering of droplet‐based and vesicle‐based artificial cells by microfluidics is also reviewed. Moreover, the artificial cells applied for imitating cell behavior and acting as bioreactors for synthetic biology are highlighted. Finally, the current challenges and future trends in microfluidic‐based artificial cells are discussed. This review should be helpful for researchers in the fields of microfluidics, biomaterial fabrication, and synthetic biology.

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Section: Flow-focusing Devices For the Fabrication Of Dropletsmentioning

confidence: 99%

Microfluidics for Biosynthesizing: from Droplets and Vesicles to Artificial Cells

Xie

Xiong

et al. 2019

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117

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“…It is therefore important to have a stable light output between the two measurements. Lifetime is usually defined as the time when the light output exceeds a specified range of fluctuations [23]. The emission spectra of the common UV sources, i.e., xenon flash lamp, deuterium lamp, mercury lamp, and UV LED, are shown in Figure 5.…”

Section: Uv Sourcesmentioning

confidence: 99%

“…LEDs have been successfully applied in analytical chemistry [27,28,29] and led to the development of affordable, cost-effective, and compact instrument designs with low power consumption. Bui et al [30], Dasgupta et al [31], and Yan Li et al [23] have reviewed the development and application of LED in analytical sciences. For details, the interested readers are invited to refer to these articles.…”

Section: Uv Sourcesmentioning

confidence: 99%

“…UV LEDs show parasitic broadband emission in the visible region, which should be taken into account when designing an absorption-based detector for UV applications [35]. A typical example of parasitic emission in the output spectrum of UV-C LED is shown in Figure 6c [23]. Parasitic emission is dominant at a low forward current (<5 mA) [36] and is predominantly caused by the presence of undesirable bands of lower energy bands in the emitting semiconductor [37,38,39] or the presence of fluorescence or phosphorescence contaminant in LED structure [40].…”

Section: Uv Sourcesmentioning

confidence: 99%

“…Recently, aluminum nitride-based (AlN) LEDs have been developed, which give high optical power out (1.5 mW, 100 mA) with a low value of parasitic emission in comparison with sapphire-based LEDs (30 mA). Li et al [23] investigated the performances of an AlN based LED for analytical applications and reported that AlN based LEDs have minimal parasitic emission in comparison with the sapphire based LEDs as shown in Figure 6c. The ratios of parasitic emission to the desired UV emissions were 0.0002% and 8% for AlN and sapphire based LEDs, respectively.…”

Section: Uv Sourcesmentioning

confidence: 99%

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Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review

Khan

Newport

Calvé

2019

Sensors

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Several gas molecules of environmental and domestic significance exhibit a strong deep-UV absorption. Therefore, a sensitive and a selective gas detector based on this unique molecular property (i.e., absorption at a specific wavelength) can be developed using deep-UV absorption spectrophotometry. UV absorption spectrometry provides a highly sensitive, reliable, self-referenced, and selective approach for gas sensing. This review article addresses the recent progress in the application of deep-UV absorption for gas sensing owing to its inherent features and tremendous potentials. Applications, advancements, and challenges related to UV emission sources, gas cells, and UV photodetectors are assessed and compared. We present the relevant theoretical aspects and challenges associated with the development of portable sensitive spectrophotometer. Finally, the applications of UV absorption spectrometry for ozone, NO2, SO2, and aromatic organic compounds during the last decades are discussed and compared. A portable UV absorption spectrophotometer can be developed by using LEDs, hollow core waveguides (HCW), and UV photodetectors (i.e., photodiodes). LED provides a portable UV emission source with low power input, low-intensity drifts, low cost, and ease of alignment. It is a quasi-chromatic UV source and covers the absorption band of molecules without optical filters for absorbance measurement of a target analyte. HCWs can be applied as a miniature gas cell for guiding UV radiation for measurement of low gas concentrations. Photodiodes, on the other hand, offer a portable UV photodetector with excellent spectral selectivity with visible rejection, minimal dark current, linearity, and resistance against UV-aging.

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Eu(II)‐Activated Silicates for UV Light‐Emitting Diodes Tuning into Warm White Light

et al. 2020

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White‐light‐emitting diodes (WLEDs) are the main white light source for general lighting due to high‐luminous efficacy (>150 lm W−1), long lifespan (5 × 104 h), and environmentally friendly properties. Despite the current maturity and reliability of the solid state‐lighting field, the control of the correlated color temperature (CCT) tuning is still a challenge, arising from the lack of red emission color in the current design of commercial WLEDs. Moreover, as this aspect is often associated with dysregulations of the human circadian rhythm, the need for novel WLEDs is of enlarged societal relevance. In this scope, herein, warm WLED prototypes are fabricated by coating near‐UV‐emitting LEDs with a mixture of the yellow‐emitting polyphasic Sr2SiO4:Eu(II) (S2S) and the blue‐emitting BaMgAl10O17:Eu(II) (BAM) phosphors dispersed in poly(methyl methacrylate). As the amount of S2S increases in the phosphor mixture, the CCT values of the WLEDs decrease from 6500 K (ideal for daylight application) to 4000 K (ideal for night light application), with a luminous efficacy of radiation of 404 lm W−1, among the best figures of merit for WLEDs. Furthermore, all the WLED devices also display a desirable color rendering index (CRI > 75), comparable with the commercial WLED, independent on the operating voltage.

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High power deep UV-LEDs for analytical optical instrumentation

Cited by 28 publications

References 34 publications

Microfluidics for Biosynthesizing: from Droplets and Vesicles to Artificial Cells

Microfluidics for Biosynthesizing: from Droplets and Vesicles to Artificial Cells

Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review

Eu(II)‐Activated Silicates for UV Light‐Emitting Diodes Tuning into Warm White Light

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