Photo Luminescence Spectrometer

Equipment Details: 

Make : Horiba Jobin Yron

Model : Fluorolog 3, FL3-11

 

Instrumentation:

It consists of an excitation source, excitation monochromator, sample chamber, emission monochromator and detector.  Steady state excitation source is a xenon lamp.

 

Technical Specification:

Spectrometer

Single-grating,Czerny-Turner with all reflective optics

Resolution

0.2 nm

Accuracy

± 0.5 nm

Speed

150 nm/s

Range

 0–1300 nm

Sensitivity

4000:1 signal-to-noise ratio

Sample detector

R928P photomultiplier tube in photon- counting mode, from 240-850 nm.

 

Equipment Photo: 
Contact Person: 

I). Dr Sunit Rane (Instrument Incharge) Office No: 020-25989273

Email id : sunit@cmet.gov.in

II)Characterization Incharge, Office no 020-25989273

Location: 
Pune Laboratory
Working Principles: 

This instrument is equipped with a steady state and transient excitation source, and a photomultiplier tube.  Steady state excitation source was a xenon lamp with broad spectral emission covering entire visible part of electromagnetic spectrum. A monochromator placed before the sample chamber selects the wavelength used to excite the sample. This monochromator is generally a combination of gratings. The excitation wavelength is generally selected from the absorption spectrum of the material being excited and corresponds to the wavelength for maximum absorption intensity. Upon excitation, electrons inside the material move to higher excited state and, their, they relax to the lowest vibrational state. After a certain delay time, electron makes a transition to the ground state by emitting a photon. This delay time is called as the excited state lifetime of material, which is measured using time resolved PL measurements. In time resolved PL measurements, light with small pulse duration (typically few ps) is used to excite the material to its higher excited state and then the PL intensity is detected as a function of time. This intensity decays with time and this decay gives a measure of excited state lifetime.