LAboratoire de Spectrochimie Infrarouge et Raman – UMR 8516
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Photoluminescence

Photoluminescence spectrometer (PL)

This unique spectrometer has been specifically developed for the needs of the laboratory in photoluminescence. The heart of this instrument consists of a Horiba Jobin-Yvon iHR320 spectrometer with 2 inputs and 2 outputs. The 2 entries are coupled with a macro-sample device or an optical microscope Olympus respectively. The outputs are used for the detection in the UV-visible domain on the one hand and the infrared on the other.

macro entryspectrometer microscope

CCD detector InGaAs detector

IHR320 spectrometer

This spectrometer has a focal length of 320 mm, and slits of 8 mm in height . The slit widths are adjustable continuously from 0 to 2 mm.

There is a turret of 3 gratings with the following characteristics:
Traits/mmBlaze (nm)
300600
900850
1200750

With a 1200gr/mm grating the typical resolution is 0.18 nm at 500nm (with the CCD detector) while it is better than 0.1 nm at about 1000 nm (with the InGaAs detector).

The iHR320 spectrometer is a fully automated spectrometer. It is controlled by the Labspec V. 5 using Windows software.

The 2 entries:

The selection of an entry is made by rotation of an internal mirror in the spectrometer.

“Front entrance” or microscope entrance

The microscope is equipped with a camera instead of the eyepiece for the visualization of the sample.
This microscope has 3 objective lenses: 10 x, 50 x and 100 x and an achromatic Cassegrain microscope objective with mirrors 15 x.
Coloured filters can be interposed between the output of the microscope and the entrance to the spectrometer.

“Side entrance” or macroscopic entrance

The macroscopic sample plate is equipped with a 2 lenses with a x3 magnification and an image rotator optic that makes it possible to project the image of a horizontal laser beam waist onto the vertical slit. Depending on the spectral range studied, 2 pairs of lenses are available: 1 pair covers the area visible-NIR region and another is dedicated to the 700nm-1550nm range.

The 2 outputs:

The output selection is made by the rotation of an internal mirror in the spectrometer

“Front exit” or multichannel output UV-visible-NIR

It is possible to study the PL in the range 350-1100 nm. The output beam from the spectrometer is sent onto a camera CCD matrix (1024 × 256) cooled by the Peltier effect at -70°C; the pixel size is 26 × 26 μm. The various spectral components are obtained simultaneously.

“Side exit” or single channel NIR

The beam coming out of the spectrometer is sent onto a single channel NIR InGaAs detector with a diameter of 2 mm. The detector has an operating wavelength range from 800 to 1700 nm and is cooled by a Peltier effect at -30 ° C. To record a spectrum we have to scan the spectral domain by rotation of the grating.

Available laser radiations:

The wavelengths are those of an ionized Argon laser.
• in the ultra-violet : 334, 351 et 364 nm
• in the visible : 458, 476, 488 et 514 nm