ZOLIX OmniFluo990 Steady-State and Time-Resolved Fluorescence Spectrometer

Overview

The ZOLIX OmniFluo990 is a high-performance, modular steady-state and time-resolved fluorescence spectrometer engineered for quantitative molecular photophysics research. It operates on the principle of photoluminescence (PL) excitation and emission detection using double monochromator architecture—comprising an excitation monochromator (Gloria75X 75 W xenon lamp + Omni-λ3027i) and an emission monochromator (Omni-λ3027i)—to deliver exceptional spectral purity and stray light suppression (<1×10⁻⁵). Its core measurement capability spans both intensity-domain (steady-state) and time-domain (time-correlated single-photon counting, TCSPC) fluorescence analysis, enabling precise determination of quantum yield, excited-state lifetimes, anisotropy decay, and time-resolved emission spectra (TRES). The system’s optical design minimizes internal scattering and chromatic aberration through optimized beam path geometry and blazed grating selection (1200/600/300 g/mm), supporting rigorous compliance with ASTM E1358 (fluorescence quantum yield) and ISO 17025 traceability requirements in accredited laboratories.

Key Features

• Modular dual-monochromator architecture with independent excitation and emission pathways for ultra-low stray light and high wavelength fidelity (±0.2 nm accuracy, ±0.1 nm repeatability)
• TCSPC data acquisition module (DCS900PC) offering timing resolution from 16 ps to 33.55 µs across 65,535 channels, supporting lifetime measurements from sub-nanosecond to 10-second scales
• Cooled red-sensitive photomultiplier tube (CR131) with spectral response from 185–900 nm and dark count ≤100 CPS at –10 °C, ensuring low-noise detection under extended integration
• Configurable grating set: 1200 g/mm (BLZ@500 nm), 600 g/mm (BLZ@750 nm), and 300 g/mm (BLZ@1250 nm) for optimal dispersion across UV-Vis-NIR ranges
• Large-capacity universal sample chamber (SAC-FLS) accommodating cuvettes, powders, thin films, and solid substrates—with optional motorized rotation, magnetic stirring, and water-jacketed temperature control interfaces
• Integrated automatic shutter system preventing detector saturation during sample exchange or alignment procedures

Sample Compatibility & Compliance

The OmniFluo990 supports diverse sample formats including standard 1-cm quartz cuvettes, micro-volume capillaries, powdered solids, spin-coated thin films, and optically dense colloidal suspensions. Its open optical architecture permits direct coupling to external cryostats (e.g., Oxford Instruments ITC503/CF1200 series) and fiber-optic probes for in-situ or remote measurements. All hardware and software modules are designed to meet essential regulatory expectations for analytical instrumentation: firmware timestamps, user-access logs, and audit-trail-enabled data recording align with FDA 21 CFR Part 11 principles; spectral calibration routines reference NIST-traceable Hg/Ne emission lines; and quantum yield calculations follow USP and IUPAC recommendations for absolute and relative methods.

Software & Data Management

ZolixScan v4.x is a Windows 10-native application providing full instrument control, real-time visualization, and post-acquisition processing. It implements GLP-compliant data handling—including electronic signatures, version-controlled method templates, and immutable raw-data archiving (HDF5 format). Steady-state functions include excitation scans, emission scans, synchronous scans, and 3D excitation-emission matrices (EEMs). Time-resolved capabilities cover kinetic decay fitting (multi-exponential convolution), lifetime mapping, TRES slicing, and global analysis using singular value decomposition (SVD). Quantum yield computation integrates reference standards (quinine sulfate, quinine bisulfate) with integrated sphere correction and inner-filter effect compensation. Export options support CSV, ASCII, and vendor-neutral JCAMP-DX for LIMS integration.

Applications

This system serves advanced research and quality control applications in academic photophysics labs, OLED/QLED materials development, pharmaceutical photostability assessment, nanomaterial characterization (quantum dots, perovskites, carbon dots), and environmental sensing (PAHs, humic substances). Its ability to resolve multi-exponential decays enables mechanistic studies of energy transfer (FRET), electron transfer kinetics, and conformational dynamics in proteins and nucleic acids. When paired with liquid nitrogen cryostats or Peltier stages, it delivers temperature-dependent lifetime and spectral shifts required for Arrhenius and Eyring analysis per ISO 14644-1 cleanroom validation protocols.

FAQ

What is the minimum detectable lifetime with the OmniFluo990?
The system achieves instrumental response function (IRF) widths <25 ps when configured with the 1200 g/mm grating and CR131 PMT, enabling reliable resolution of lifetimes down to ~500 ps.
Can the OmniFluo990 measure fluorescence quantum yield quantitatively?
Yes—it supports both absolute (integrating sphere-assisted) and relative (reference-standard-based) quantum yield protocols compliant with USP and IUPAC guidelines.
Is the software validated for regulated environments?
ZolixScan includes configurable audit trails, user role management, and electronic signature support—designed to facilitate 21 CFR Part 11 readiness upon site-specific validation.
Does the system support NIR detection beyond 900 nm?
Yes—via optional Hamamatsu detectors (e.g., R5509-73: 300–1700 nm) and compatible 300 g/mm gratings, extending steady-state and TCSPC operation into the short-wave infrared.
How is wavelength calibration performed and maintained?
Calibration uses onboard Hg/Ne spectral lamps with automated peak identification; calibration files are stored per grating position and recalled dynamically during scan execution.