How does a spectrofluorometer work and what are its main components?

A spectrofluorometer uses a broadband excitation source (commonly xenon arc, deuterium, or LEDs), an excitation monochromator or filter to select the excitation wavelength, and optics to illuminate the sample at 90° relative to the detection path to minimize scattered light. Emitted fluorescence is collected, passed through an emission monochromator or filter set, and detected by a photomultiplier tube (PMT), photodiode, or array detector, with signal processing electronics converting photon counts into calibrated spectra.

What are the main types of spectrofluorometers and how do they differ?

Common types include steady‑state spectrofluorometers (intensity vs wavelength only) and time‑resolved spectrofluorometers, which use pulsed excitation and time‑correlated single photon counting (TCSPC) or gated detection to measure fluorescence lifetimes. There are also microplate spectrofluorometers optimized for high‑throughput well‑plate assays, fiber‑coupled instruments for remote or in‑situ measurements, and confocal or microscopy‑based systems for spatially resolved fluorescence mapping.

Which key specifications should I consider when selecting a spectrofluorometer?

Critical parameters include spectral range for both excitation and emission (e.g., 200–800 nm), spectral bandwidth and resolution (e.g., 1–5 nm), sensitivity expressed as signal‑to‑noise ratio or detection limit for standard fluorophores, and stray light rejection or Raman/ Rayleigh scatter suppression. You should also check dynamic range, linearity, polarization capabilities (for anisotropy), and whether the instrument supports temperature control, automated cuvette changers, or microvolume accessories needed for your applications.

How do detector type and optical design impact performance and application fit?

PMT‑based systems typically offer higher sensitivity and lower noise for weak signals, while CCD/CMOS array detectors enable faster acquisition and full‑spectrum capture but may have lower sensitivity in the UV and higher dark noise. Double‑monochromator designs and cross‑beam geometries improve stray‑light rejection for highly scattering samples, whereas filter‑based instruments trade tunability and spectral resolution for higher throughput and speed in routine assays.

What affects pricing and lead time for spectrofluorometers, and which custom options are common?

Pricing is driven by optical complexity (single vs double monochromator), detector configuration (single PMT vs multiple detectors or arrays), time‑resolved capabilities, and integrated modules such as temperature‑controlled sample chambers or microplate readers. Lead times can range from a few weeks for standard benchtop units to several months for custom systems with specialized excitation sources (e.g., pulsed lasers), extended UV/NIR ranges, fiber‑optic sampling heads, or OEM‑specific mechanical and software interfaces.

How can I find, compare, and request quotes for spectrofluorometers on FindLight without creating an account?

On FindLight, navigate to Spectral Analysis > Spectroscopy Solutions > Spectrofluorometers to view all available instruments, then use filters such as spectral range, detector type, excitation source, and measurement mode to narrow results. You can open product pages in separate tabs to compare specifications side‑by‑side, and use the built‑in contact or “Request Quote” forms on each listing to send technical requirements directly to suppliers without registration; responses arrive via email.

Filter Products

Photomultiplier Tube (PMT)

Yes

Steady-State Fluorescence (Emission Spectra)

Excitation Spectra

Emission Scans (fixed excitation)

Excitation Scans (fixed emission)

Fluorescence Lifetime Measurement

Time-Resolved Emission Spectra (TRES)

Spectrofluorometers for Fluorescence Measurement

OmniFluo900 Series Spectrofluorometer

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Sold by: Zolix Instruments CO.,LTD Ships from: China

Specifications
Excitation Source Type:	N/A
Excitation Wavelength Range:	200 – 1700 nm
Emission Wavelength Range:	400 – 3700 nm
Detector Type:	Photomultiplier Tube (PMT)
Lifetime Measurement:	Yes

Did You Know?

Fluorescence spectroscopy is a technique that analyses the emitted fluorescence from a sample that has been excited by a beam of light (usually UV). The emitted light – the fluorescence – contains spectral information on the molecular vibrations of the studied sample. Generally, two types of instruments are currently available on market – filter fluorometers and spectrofluorometer. Filter Fluorometers contain an optical filtration system to filter out the excitation beam to allow high-sensitivity detection of the fluorescent light. In contrast, spectrofluorometers usually contain gratings based monochromator systems to isolate the incident excitation beam. Advances in the sensitivity of detection have recently allowed adapting this technique at microscopic levels for the study of biochemical and biophysical properties of cells by combining microscopy and fluorescence spectroscopy into a new technique called microfluorimetry.

Related Resources

Frequently Asked Questions

A spectrofluorometer is an instrument that measures the fluorescence emission spectrum of a sample as a function of excitation wavelength and emission wavelength. It typically provides excitation and emission spectra, intensity versus wavelength plots, excitation–emission matrices (EEMs), fluorescence lifetime data (if time‑resolved), and quantitative concentration measurements via calibration curves.

What Are Spectrofluorometers?

Spectrofluorometers are optical instruments designed to measure fluorescence emission as a function of excitation wavelength and intensity. A typical spectrofluorometer integrates an excitation source, monochromators or filters, sample compartment, emission optics, and a sensitive detector such as a photomultiplier tube (PMT) or photodiode array. By scanning excitation and emission wavelengths, spectrofluorometers generate excitation-emission matrices and calibrated fluorescence spectra for qualitative and quantitative analysis.

Typical Specifications and Performance Parameters

Key specifications for spectrofluorometers include excitation and emission wavelength ranges, typically covering UV to near-IR (e.g., 200–800 nm or wider), spectral bandwidth, and wavelength accuracy. Buyers should review spectral resolution (commonly 1–5 nm), stray light rejection, and sensitivity, often expressed as signal-to-noise ratio using a standard fluorophore such as Raman water or quinine sulfate.

Other relevant parameters for spectrofluorometers are:

Light source: Xenon arc lamps, xenon flash lamps, lasers, or LEDs.
Detection geometry: Right-angle, front-face, or fiber-coupled configurations.
Time-resolved capability: Options for lifetime measurements using pulsed sources and time-correlated detection.
Dynamic range and linearity: Important for quantitative assays.
Sample handling: Cuvette holders, temperature control, microplate capability, or integration with flow cells.

Use Cases for Spectrofluorometers

Spectrofluorometers are used in analytical chemistry, biophysics, materials science, and environmental monitoring. Common applications include protein and nucleic acid quantification, fluorescence labeling studies, quantum yield determination, characterization of fluorophores, evaluation of optical materials, and detection of trace contaminants. In industrial R&D, spectrofluorometers support quality control of fluorescent dyes, LEDs, and phosphors, as well as development of biosensors and nanomaterials.

Buyer Guidance on FindLight

When sourcing spectrofluorometers on FindLight, procurement engineers and researchers should compare excitation/emission ranges against fluorophore requirements, verify spectral resolution, and ensure sufficient sensitivity for low-concentration samples. Check whether the instrument supports steady-state only or also time-resolved fluorescence, and confirm compatibility with your preferred sample formats.

Evaluate detector type, optical configuration, and available accessories such as temperature-controlled sample holders or fiber probes. On FindLight you can review technical details for available spectrofluorometers, shortlist suitable models, and request quotes directly from manufacturers or distributors. No registration is required to contact suppliers or obtain pricing and lead-time information.