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Circularly polarized luminescence (CPL) spectra are said to contain important information for chemical reactions via excited states, such as the stable structure of excited molecules and their behaviors. Since the fluorescence intensity generated from the sample is relatively small and the CPL signal is even smaller, CPL signal detection was considered difficult. CPL-300 is based on the new J-1000 series, it detects this weak CPL signal with high sensitivity. Furthermore, CPL measurement can be used with higher sensitivity in a wider wavelength range by the new technology found this time.


Realization of extremely low stray light and high resolution measurement

CPL-300 adopts prism spectroscopy like J-1000 series.

As a result, no stray light or linearly polarized light is generated when the diffraction grating is used, so that the low-light side light which can not be achieved with the diffraction grating monochromator is realized. Also. This prism spectroscopy demonstrates high wavelength resolution capability in the ultraviolet region.


Ozone-free xenon light source

By installing ozone-free xenon light source (standard light source), excitation light with high intensity is emitted. (No nitrogen purge required)

In addition, if 150 W mercury xenon (option) is installed, high power excitation light can be used for measurement at mercury emission line wavelength.

Characteristics of circular polarized luminescence measurement system CPL-300

Object of measurement covered by circularly polarized luminescence (CPL)

The chirality of the ground state molecule can be known from usual CD measurement, but CPL measurement gives chirality information of the excited molecule. Besides fluorescent chiral organic compounds, chiral complexes of rare earths, proteins and others are compounds to be measured.


High sensitivity measurement with PEM and high sensitivity PMT detector

With the PEM modulation system and high sensitivity PMT, it is possible to detect very weak CPL signals not only with fluorescent signals but also with high sensitivity.


Extremely low stray light, high resolution measurement

We realized low-light measurement by prism spectroscopy and high-resolution measurement on short wavelength side. 

Extensive measurement and wavelength extension function

When ozone-free 150 W xenon light source is used, CPL measurement is possible within the range of 250 nm to 850 nm (improved type). Furthermore, by installing a 150 W xenon light source (option), excitation light irradiation can be used in the wavelength region shorter than 250 nm (Necessiture nitrogen purge).


Excitation side / fluorescence side wavelength scan

Fluorescence can scan excitation light with fixed excitation wavelength.


Abundant analysis tool

Conversion from CPL spectrum to Glum and ΔF is possible.



Model name
light source 150 W Xe lamp (air cooling system)
Detector Head-on type PMT
Modulator Piezoelastic modulator with temperature adjustment
Measurement wavelength range 250 nm to 850 nm 
400 nm to 1100 nm (special accessory wavelength extended PMT detector)
Scan method Continuous scan, step scan, automatic response scan
Stray light 0.001% or less
Size 2000 (W) x 700 (D) x 1000 (H) mm
weight 180 kg
Control, measure, analyze, save with spectrum manager Ver.2
Supported OS Windows 8.1 Professional (64 bit)
Data measurement Circularly polarized luminescence measurement (CD), total fluorescence component measurement (DC), CD / DC measurement
Data analysis g (lum) calculation, ΔI calculation


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