280nm Bandpass Filter

Belonging to the ultraviolet C (UVC) spectrum, 280nm light exhibits high photon energy, enabling effective disruption of microbial DNA/RNA structures, while also demonstrating selective excitation capability for specific fluorescent molecules.

  • Application 1: UV Sterilization Systems - Deployed in UV disinfection equipment to precisely isolate the 280nm wavelength, it achieves efficient inactivation of bacteria, viruses, and other pathogens in air or water systems, ensuring hygiene standards in critical environments such as healthcare facilities and food processing plants.
  • Application 2: Biomolecular Analysis - Utilized in analytical instruments like fluorescence spectrophotometers, the 280nm bandpass filter selectively transmits this wavelength to facilitate accurate measurement of protein/nucleic acid fluorescence excitation or absorption spectra, supporting applications in biochemistry, molecular biology, and medical diagnostics.
  • Application 3: Semiconductor Quality Control - In research and industrial inspection, this filter enables non-destructive detection of sub-micron defects on semiconductor wafer surfaces by leveraging the unique penetration properties of 280nm light and its wavelength-specific selectivity, critical for advanced microelectronics manufacturing.
280nm Bandpass Filter
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4 items
Center Wavelength (nm)
FWHM (nm)
Optical Density(OD)

Filter

Center Wavelength (nm)
FWHM (nm)
Optical Density(OD)
US20240201131A1 - Native Fluorescence Detection for Protein Analysis

US20240201131A1 - Native Fluorescence Detection for Protein Analysis

Context: This patent describes a Capillary Electrophoresis (CE) system designed to detect proteins without using external dye labels. It relies on "Native Fluorescence Detection" (NFD).

Usage of Filter: The 280nm bandpass filter (specifically cited as having a transmission bandwidth of 270–290nm) is positioned in the optical path between the light source (laser-driven plasma) and the capillary tube containing the sample.

Function: Its function is to strictly isolate the excitation wavelength. It blocks all stray light from the broadband source, allowing only the 280nm UV light to pass through and irradiate the protein sample.

Result: This specific excitation causes the Tryptophan amino acids within the proteins to fluoresce naturally at ~350nm. By removing background noise with the filter, the system achieves a Limit of Detection (LOD) of 10-20 nM, which is 25 times more sensitive than standard UV absorbance methods.

US10561156B2 - Device for UV-LED Liquid Monitoring and Treatment

US10561156B2 - Device for UV-LED Liquid Monitoring and Treatment

Context: This patent (assigned to LARQ Inc.) covers portable water purification devices, such as self-cleaning water bottles, which use UV-C LEDs to neutralize bacteria in the liquid.

Usage of Filter: The 280nm bandpass filter is used over the internal photodetector (monitor sensor) located inside the cap or base of the device.

Function: The filter blocks visible light and ambient solar radiation (if the bottle is open or translucent) from reaching the sensor, ensuring the sensor measures only the intensity of the germicidal 280nm light emitted by the internal LEDs.

Result: This allows the device’s processor to accurately calculate the cumulative germicidal dose delivered to the water. It ensures the water is fully sterilized before stopping the cycle, optimizing battery life by preventing "over-dosing" beyond what is necessary.

US9603960B2 - Flexible Article for UV Disinfection with Feedback

US9603960B2 - Flexible Article for UV Disinfection with Feedback

Context: This patent describes a flexible or wearable UV disinfection device (e.g., a mat or wrap) that conforms to the shape of an object (like a door handle or medical tool) to sterilize it.

Usage of Filter: The 280nm bandpass filter is integrated into the "feedback sensor" assembly embedded within the flexible substrate.

Function: The filter acts as a discriminator for the feedback loop. It ensures the sensor detects only the reflected/backscattered 280nm light from the treatment surface, ignoring room lighting or other interference.

Result: This provides closed-loop verification, confirming that the target surface is actually receiving the UV-C radiation. If the sensor (behind the filter) does not detect the 280nm reflection (e.g., if the device is not wrapped correctly), the system can alert the user or shut down for safety.

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