IndiGo fluo UVA-C: a fluorescence spectrometer with UVA & UVC excitation

The IndiGo Fluo UVA UVC is a portable fluorescence spectrometer combining two complementary electroluminescent excitation domains: near-ultraviolet (365 nm UVA) and deep germicidal ultraviolet (255 nm UVC). This dual optical path enables instantaneous on-site comparative analysis across long-wave and short-wave (LW/SW) regimes without bulky discharge lamps or dedicated benchtop installations.

Equipped with an array of 4 × UVA LEDs at 365 nm (100 mW) and 2 × UVC LEDs at 255 nm (20 mW) operating in regulated pulsed mode, the instrument accurately records emission spectra from 380 to 780 nm. Engineered for direct surface contact analysis on solids and adaptable to liquids and powders via modular holders, this optical head is 100% interchangeable on the universal IndiGo UV-Vis core.

Optical Architecture & Dual UVA / UVC Excitation features

• Calibrated dual LED excitation array:
  • UVA channel (4 × 365 nm): 100 mA nominal current delivering 100 mW aggregate optical power. Benchmark excitation for conjugated organic fluorophores, security inks, and crystalline defects.
  • UVC channel (2 × 255 nm): 300 mA nominal current providing 20 mW total optical power. Deep energetic excitation for inorganic luminescent centers, mineral activators, and level-3 security taggants.
• Sequential drive & regulated pulsing:
  • UVA and UVC channels activate alternately to eliminate spectral overlap.
  • SpectroLab sequencing: automated acquisition protocols capturing sequential UVA and UVC spectra in a single trigger action.
  • Fine current regulation: pulsed modulation adjustable from 1% to 100% on each channel, ensuring optical repeatability while preventing sample photodegradation.
• High-selectivity optical filtering:
  • Collection filtering (Standard): built-in Long-Pass (LP) 385 nm edge filter at the spectrometer slit, rejecting excitation line scatter to monitor the visible spectrum from 380 to 780 nm.
  • Excitation purity (Option): Short-Pass (SP) 395 nm clean-up filters mounted in front of the LEDs to strip residual visible out-of-band emission.
• High resolution with standard 25 µm slit: fitted standard with a 25 µm slit (< 1.5 nm resolution) to separate transition metal and rare-earth emission multiplets. Optional 70 µm (< 5 nm) and 150 µm (< 10 nm) slits available for higher photon flux.
• CMOS detector options:
  • ON Semi MT9M001 (Standard): reliable, field-proven sensor for quality control, authentication, and education.
  • Sony IMX334 monochrome: low-noise, high-dynamic-range 2D CMOS sensor recommended for weak UVC-induced photoluminescence.
• Interchangeable head architecture: the UVA UVC module mounts tool-free on the IndiGo UV-Vis base and swaps seamlessly with UVA, UVA UVB, or laser modules.

Optical Safety by Design (60° Emission cone)

Non-coherent LED sources provide safe, manageable handling in mobile workflows:

• 60° beam divergence: wide conical, uncollimated emission causes optical irradiance (W/cm²) to decrease rapidly with distance from the aperture.
• Direct contact measurement: placed flush against solid specimens, documents, or minerals, the head contains UV radiation during acquisition.
• Safety guidance: no mechanical interlock is required. Due to short-wavelength 255 nm UVC emission, never look directly into the aperture when energized, and wear standard UV-blocking safety eyewear during open-beam tests.

Sampling Modularity: Solids, Powders & Liquids

Engineered to handle diverse laboratory and field sample presentations:

• Flush solid contact: direct non-destructive positioning on rough minerals, cut gemstones, identity documents, banknotes, and polymer components.
• Quartz cuvette holder: accommodates standard 10 × 10 mm suprasil quartz cuvettes (required for 255 nm UVC transmission) for liquid assays.
• Vials & powder holders: dedicated accessories for powdered minerals, pigments, and tablets.

Key Applications & Analytical fields

Cross-referencing photoluminescence under 365 nm (LW) and 255 nm (SW) provides unmatched spectral discrimination:

• Advanced gemology & field mineralogy:
  • Natural vs. synthetic diamonds: spectral identification of optical color centers (N3, H3, NV) and verification of HPHT or CVD synthetic diamond responses under UVC.
  • Diagnostic mineral luminescence: distinct LW/SW reactions in scheelite (strong blue emission under 255 nm, inert at 365 nm), manganese-activated calcite, willemite, benitoite, and fluorite.
  • Treatment detection: spotting resin filling and thermal enhancement across emeralds, sapphires, and rubies.
• High-security identity & document authentication:
  • Level-3 UVC security inks: screening invisible security features responding selectively to 254/255 nm on passports, currency, and tax stamps.
  • Cross-spectral certification: dual-band verification combining UVA and UVC spectral profiles for secure traceability.
• Materials science & technical coatings:
  • Resins and photopolymers: curing verification and formulation control for specialized UVC-reactive protective coatings.
  • Semiconductors and optics: surface cleanliness verification, photoresist residue detection, and phosphor film characterization.
• Environmental & industrial hygiene:
  • Surface inspection: indirect cleanliness validation via organic residue fluorescence under UVC excitation.
  • Inorganic taggants: authenticating covert tracers activated exclusively in the deep UV band.

Technical Specifications

SpectroLab Software Ecosystem & Analytics

• SpectroLab (Included, free, unlimited license): dedicated current adjustment for UVA and UVC channels, automated LW/SW routines, background subtraction, peak area integration, and standard data export formats (.xlsx, .csv, .txt, .spc).
• Android application: Bluetooth connectivity for field operations, GPS metadata tagging, and portable spectral library management.
• Expert / Capture chemometrics suite (Option): multivariate analysis (PCA) merging UVA and UVC spectral data into composite vectors for automated mineral sorting and document validation.

💡 OEM Integration & Custom Development

Looking to integrate a dual UVA/UVC optical head into an industrial sorting setup or validate security marks under 255 nm excitation? GoyaLab supplies adaptable OEM modules and develops bespoke mechanical sampling interfaces.

👉 Contact our engineering team to evaluate your project or request a quote

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