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SPEX Triplemate Spectrophotometer for low temperature photoluminescence
Operational Procedure
1. Mounting the Sample
1a. Close the vacuum valve V1 connected to pumping system, loosen the fastener of the exhaust hole, rotate and loosen the sealing O-ring, and exhaust vacuum.
1b. Gently rotate the outer shield of the sample holder and pull it out.
1c. Gently rotate the inner shield of the sample holder and take it out.
1d. Take out the old sample.
1e. Mount the new sample, keep surface clean. With help of the argon laser, adjust the position of the sample.
1f. Put back the inner shield of the sample holder.
1g. Close the exhaust hole, turn on the mechanical pump, hold the outer shield and simultaneously open the vacuum valve V1.
2. Cooling CCD Detector
2a. Make sure that the CCD power is on before cooling. Fill the liquid nitrogen in the cooling tank of the CCD detector with a dewar bottle.
2b. Click the icon of SHORTCUT TO HWINIT, monitor the cooling temperature. It takes 3 to 4 hours to reach 140 K. When temperature reaches 140 K, type E.
3. Cooling the Sample
The pumping system include and a mechanical pump and air-cooled diffusion pump. When the vacuum reaches 10-3 torr, turn on the compressor. Remember check compressor cooling water lines and make sure water is on before turn on the compressor.
Make sure the cooling valve J-T is open, wait about 1.5 hours, when the temperature reaches about 150 K, close the valve V1, and turn J-T valve to 5-turns open. When the temperature reaches 40K, close the J-T
valve. Wait one hour, till temperature controller T1 shows 3.2K.
4. Photoluminescence Measurements
Click the icon of SHORTCUT TO ISAMAIN, set the experiment parameters and begin data acquisition. The spectrometer is calibrated using the Argon laser.
Experimental Apparatus for Low Temperature Photoluminescence
For the theory of Photoluminescence please click here
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