Photoluminescence Spectroscopy

Photoluminescence spectroscopy is a efficient, non-destructive and contactless method of probing electronic properties of material, especially for direct-band semiconductors. It is therefore widely used to determine the bandgap energy, alloy composition and other optical and electrical properties of semiconductor. Photoluminescence is also very sensitive to very small levels of impurities that emit light.

Here in Quantum Optoelectronics Laboratory, we are able to perform photoluminescence measurements with different pump sources. Measurements at temperature ranges between 77K and room temperature can also be performed.

• Photoluminescence system with a Ti: sapphire laser system:
  1. Light Source: Coherent Mira-900F Ti: sapphire laser
     
     

     	Fundamental	2nd Harmonic	3rd Harmonic
     Wavelength Available:	~810nm	~405nm	~275nm
     Pulsewidth:	200 fs	250 fs	250 fs
     Repetition rate:	76 MHz (reducible)

  2. Spectrometer: Instrument SA, Inc. HR-320
  3. Dry ice cooled GaAs Photomultiplier
• Photoluminescence system with an Ar Ion laser:
  1. Light source: Coherent Innova-90 laser system
     
     

     Wavelength available:	485 nm	514 nm
     Mode:	CW and Pulse mode available

  2. Spectrometer: Jarrell Ash 82-020 spectrometer
  3. Dry ice cooled S-1 Photomultiplier with a cavity dumper for pulsed operation, 485 and 514 nm tunable
• Photoluminescence system with a XeCl Excimer laser:
  1. Light source: Lambda Physik LPXi-120i XeCl laser
     
     

     Wavelength available:	308 nm
     Power:	200 mj/pulse

  2. Spectrometer: Instrument SA, Inc. HR-640
  3. Air ice cooled S-20 Photomultiplier

Instrumentation

• Coherent Mira-900F Ti: sapphire system