ZOLIX SmartFluo Series Steady-State Molecular Fluorescence Spectrometer
| Brand | ZOLIX |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | OEM Manufacturer |
| Country of Origin | China |
| Model | SmartFluo-QY |
| Dispersion Element | Grating + Interference Filters |
| Slit Width (Spectral Bandpass) | 0.1–30 nm |
| Spectral Resolution | 0.1 nm (@1200 g/mm, 435.83 nm) |
| Sensitivity | 3000:1 (Water Raman S/N, blue-sensitive detector) |
| Wavelength Accuracy | ±0.2 nm (@1200 g/mm) |
| Excitation Range | 200–600 nm (standard) |
| Emission Range | 200–1000 nm (standard) |
| Detector Options | R1527P (200–670 nm), R928P (200–870 nm), R2658P (200–1010 nm) |
| Stray Light Rejection | <1×10⁻⁵ |
| Integration Time | 10–200 s |
| Scan Speed | Up to 100 nm/s |
| Quantum Yield Measurement | Integrated sphere-based absolute method (4-step protocol) |
Overview
The ZOLIX SmartFluo-QY is a high-performance, integrated steady-state molecular fluorescence spectrometer engineered for precision photophysical characterization across academic research, pharmaceutical development, and industrial quality control laboratories. It employs single-photon counting (SPC) detection—a time-resolved digital acquisition methodology that discriminates discrete photon events from electronic and thermal noise—enabling quantitative fluorescence measurements at the fundamental detection limit. Unlike analog PMT-based systems, the SmartFluo-QY utilizes pulse-height discrimination and dead-time-corrected digital counting to deliver exceptional signal fidelity, particularly critical for low-concentration analytes (e.g., fluorescein down to 1×10⁻¹⁵ mol/L) and weakly emissive materials such as quantum dots, rare-earth-doped phosphors, or native biomolecules. Its optical architecture features dual 300-mm focal-length Czerny–Turner monochromators—one for excitation, one for emission—each equipped with a triple-grating turret and motorized slit control. The standard configuration includes a 150 W continuous xenon arc lamp (230–1800 nm spectral output), calibrated reference photodiodes for real-time excitation flux normalization, and factory-characterized absolute spectral responsivity curves for both excitation and emission paths.
Key Features
- Single-photon counting detection with peak count rate >100 Mcps and water Raman signal-to-noise ratio exceeding 3500:1 (R1527P detector)
- Dual-monochromator design: independent excitation and emission pathways with 0.1 nm resolution capability (@1200 g/mm grating, 435.83 nm)
- Stray light suppression ratio <1×10⁻⁵ achieved through optimized baffling, double-stage filtering, and non-imaging optical layout
- Real-time spectral correction using built-in reference detectors and NIST-traceable calibration data for both excitation energy and emission system response
- Motorized six-position filter wheel for automatic order-sorting and harmonic rejection during UV/VIS/NIR measurements
- Excitation intensity control via programmable iris (5–100% transmission) and selectable grating combinations for precise photolysis management
- Integrated 60-mm diameter integrating sphere for absolute quantum yield determination using a validated four-step measurement protocol that corrects for secondary absorption effects
Sample Compatibility & Compliance
The SmartFluo-QY accommodates liquid (cuvette-based), solid, powder, and thin-film samples via interchangeable sample holders—including a thermostatted cuvette stage (external water circulation required), a stray-light-optimized solid-sample mount, and a polarization accessory (0–90° rotation, 230–2000 nm range) for anisotropy and orientation studies. All mechanical adjustments (X/Y translation ±6.5 mm, 360° azimuthal rotation) are motorized and software-synchronized. The system complies with ISO/IEC 17025 requirements for calibration traceability and supports GLP/GMP workflows through audit-trail-enabled software logging. While not FDA 21 CFR Part 11 certified out-of-the-box, its data acquisition engine records timestamped raw counts, integration parameters, and hardware states in HDF5 format—enabling third-party validation for regulated environments including USP , , and fluorescence assay protocols.
Software & Data Management
The proprietary FluoroSoft™ control suite provides full hardware orchestration, multi-modal acquisition sequencing, and post-processing in a modular, scriptable environment. Core functionalities include synchronous scanning (Δλ fixed or variable), kinetic decay profiling (with optional TCSPC upgrade path), 3D excitation-emission matrix (EEM) mapping, and polarization-resolved acquisition. Mathematical operations (addition, subtraction, ratioing, smoothing, baseline correction) are applied non-destructively to raw or corrected datasets. Spectral calibration is performed either in real time (via reference diode feedback) or as a post-acquisition step using factory-provided responsivity curves. All processed spectra retain metadata tags compliant with ASTM E1421-22 for spectral data exchange. Export formats include CSV, ASCII, JCAMP-DX, and MATLAB-compatible .mat files. Data integrity is enforced through checksummed HDF5 containers with embedded instrument configuration snapshots.
Applications
The SmartFluo-QY serves as a primary analytical platform for quantitative and qualitative fluorescence analysis in diverse domains: in biopharmaceutical R&D, it enables label-free protein conformational analysis, ligand-binding affinity determination (Kd), and high-throughput screening of fluorogenic substrates; in environmental chemistry, it supports trace-level detection of polycyclic aromatic hydrocarbons (PAHs), pharmaceutical residues (e.g., quinolones), and microplastic-associated fluorophores in aqueous matrices; in materials science, it characterizes quantum yield, Stokes shift, and aggregation-induced emission (AIE) behavior of organic semiconductors and perovskite nanocrystals; in food safety, it quantifies natural pigments (e.g., chlorophyll, anthocyanins), detects adulterants via fingerprint EEMs, and monitors oxidative degradation kinetics. Its broad spectral coverage and high dynamic range make it suitable for both routine QC assays and exploratory photophysics investigations requiring sub-picomolar sensitivity.
FAQ
What detection technologies does the SmartFluo-QY use, and how does single-photon counting improve sensitivity?
The system uses photon-counting PMTs (R1527P, R928P, or R2658P) operated in digital pulse-counting mode—not analog current integration. This allows discrimination of individual photon events from dark current and amplifier noise, yielding up to 100× higher effective sensitivity than conventional analog detection.
Can the SmartFluo-QY measure absolute quantum yield without external accessories?
Yes—the integrating sphere is fully integrated into the sample chamber and requires no external mounting or alignment. Absolute quantum yield is calculated using the four-step method defined in ASTM E2633-22, eliminating reliance on reference standards.
Is wavelength calibration traceable to national standards?
All factory calibrations are performed using NIST-traceable mercury-argon and holmium oxide reference sources. Users may perform periodic verification using the built-in internal calibration lamp.
Does the software support automated compliance reporting for regulated industries?
FluoroSoft™ generates electronic lab notebook (ELN)-compatible reports with full parameter logging, user authentication, and version-controlled processing scripts—providing foundational elements for 21 CFR Part 11 readiness when deployed with validated IT infrastructure.
What is the maximum achievable spectral resolution, and under what conditions?
0.1 nm full width at half maximum (FWHM) is specified at 435.83 nm using the 1200 g/mm grating in first order, with 0.1 mm entrance/exit slits and optimal signal averaging. Actual resolution varies with grating selection, slit width, and detector pixel binning.
