An innovative Si package for high-performance UV LEDs

Kaepplinger, Indira; Taeschner, Robert; Mitrenga, Dennis; Karolewski, Dominik; Li, Long; Meier, Christian; Schaedel, Martin; Ortlepp, Thomas

doi:10.1117/12.2509395

Cited by 4 publications

(5 citation statements)

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“…The far field pattern exhibits four local maxima at 40° inclined to the chip normal caused by nearly 50% of the emitted light being emitted via the side surfaces of the LED chip 25 . To obtain a more directional radiation, a specially designed silicon-based surface mounted device package 32 , with an integrated aluminum reflector was used for the packaging of the LEDs (Fig. 1 c).…”

Section: Resultsmentioning

confidence: 99%

“…The far-UVC LED chips were flip-chip mounted on 3.5 mm × 3.5 mm surface-mounted device (SMD) Si-based packages (developed by CiS Forschungsinstitut für Mikrosensorik GmbH) with a thermal conductivity of 150 W/(m·K) using AuSn solder paste 32 . The thickness of the Au–Sn layer was determined to be 15 µm.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, the radiation pattern of the active region was determined by the degree of polarization ((TE − TM)/(TE + TM) = − 0.4) 51 . The light scattering at the ELO AlN/sapphire interface and the rough sapphire sidewalls of the chip, as well as the reflection at the Al-reflector of the Si-based SMD package were taken into account 32 , 51 . Surface roughness was described by the distribution of corresponding microscopic slope angles.…”

Section: Methodsmentioning

confidence: 99%

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Skin tolerant inactivation of multiresistant pathogens using far-UVC LEDs

Glaab

Ploch

Cho

et al. 2021

Sci Rep

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Multiresistant pathogens such as methicillin-resistant Staphylococcus aureus (MRSA) cause serious postoperative infections. A skin tolerant far-UVC (< 240 nm) irradiation system for their inactivation is presented here. It uses UVC LEDs in combination with a spectral filter and provides a peak wavelength of 233 nm, with a full width at half maximum of 12 nm, and an irradiance of 44 µW/cm2. MRSA bacteria in different concentrations on blood agar plates were inactivated with irradiation doses in the range of 15–40 mJ/cm2. Porcine skin irradiated with a dose of 40 mJ/cm2 at 233 nm showed only 3.7% CPD and 2.3% 6-4PP DNA damage. Corresponding irradiation at 254 nm caused 15–30 times higher damage. Thus, the skin damage caused by the disinfectant doses is so small that it can be expected to be compensated by the skin's natural repair mechanisms. LED-based far-UVC lamps could therefore soon be used in everyday clinical practice to eradicate multiresistant pathogens directly on humans.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Skin tolerant inactivation of multiresistant pathogens using far-UVC LEDs

Glaab

Ploch

Cho

et al. 2021

Sci Rep

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“…Without a filter lid, both LEDs show an identical emission spectrum for all emission angles. With increasing polar emission angle, the peak position and shape of the spectra remain identical but the spectral intensity decreases, following the typical far-field radiation pattern of LEDs in a package with an integrated aluminum reflector [22]. When mounting either a filter S lid or a filter L lid on these LEDs, the spectra change substantially.…”

Section: Spectral Properties Of the Filter And The Led Emissionmentioning

confidence: 76%

“…The wafers were processed with standard microfabrication techniques to LEDs with an actively emitting area of 0.157 mm 2 and 0.485 mm 2 using Pt-based p-contacts and V/Al-based n-contacts [21]. After dicing, 1.06 mm × 0.66 mm and 1 mm × 1 mm chips were flip-chip mounted on Si-based surface-mounted device (SMD) packages with an integrated aluminum reflector [22] as shown in figure 1(a).…”

Section: Methodsmentioning

confidence: 99%

Spectrally pure far-UVC emission from AlGaN-based LEDs with dielectric band pass filters

Guttmann

Ploch

Gundlach

et al. 2022

J. Phys. D: Appl. Phys.

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AlGaN-based far ultraviolet-C (UVC) light emitting diodes (LEDs) with a peak emission wavelength below 240 nm typically show a long-wavelength tail at >240 nm that is detrimental to the use of the devices for skin-friendly antisepsis. We present the development of far-UVC LEDs with reduced long-wavelength emission using a HfO2/SiO2-based distributed Bragg reflector (DBR) filter. When the DBR filter is directly mounted on an LED package, the long-wavelength emission around 250 nm is reduced by two orders of magnitude while the transmitted output power is reduced down to 18%–27% of the initial value for DBR filters with cut-off wavelengths at 237–243 nm. As the transmission through the DBR filter depends strongly on the angle of incidence of the radiation, the transmitted output power of the spectrally pure far-UVC radiation can be doubled when an additional collimating lens is used on top of the LED package before passing through the filter.

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A review on thermal management of light-emitting diodes: From package-level to system-level

Li,

Tan,

et al. 2024

Applied Thermal Engineering

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An innovative Si package for high-performance UV LEDs

Cited by 4 publications

References 0 publications

Skin tolerant inactivation of multiresistant pathogens using far-UVC LEDs

Skin tolerant inactivation of multiresistant pathogens using far-UVC LEDs

Spectrally pure far-UVC emission from AlGaN-based LEDs with dielectric band pass filters

A review on thermal management of light-emitting diodes: From package-level to system-level

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