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Nanofabrication Facility
Capabilities & Equipment > Characterization Systems
Photo- and Electro-luminescence Characterization System
Electro- and Photo-Luminescence Setup. The optical cryostat can be used for measurements at temperatures ranging from 2.9 to 500 K.
Photoluminescence from different materials showing the spectral range of the spectrometer. The top axis shows the available excitation laser wavelengths listed above and their relative intensities (approx.). The Rh6G-PEO sample was fabricated by Nikhil Sharma and Darrin Pochan.
Photo- and Electro-luminescence spectroscopy techniques are widely used to investigate the optoelectronic properties of novel materials & devices. Our characterization system consists of an optical cryostat that allows to measure samples from 3.2 to 500 K. One 10-pin and one subminiature coax electrical terminals are available to connect the sample. Low-temperature measurements are achieved using either LHe (< 77K) or LN2 (77-300K) cryogen. For photoluminescence measurements, the excitation can be performed using the following lasers:
- Nitrogen (337 nm, 6 mW average power at 20 Hz, 4 nsec pulse, 1-30 Hz rep. rate)
- DUO Dye Laser (Nitrogen-pumped) - Tunable 360-600nm (*)
- Argon - Can Select from 454 nm (10 mW), 457 nm (300 mW), 465 nm (70 mW), 473nm (100mW), 476nm (600mW), 488nm (1.3W), 496nm (600mW), 502nm (300mW), 514nm (1.7W) or 529nm (350mW). (*)
- Frequency-stabilized DPSS (532 nm and 250 mW)
- Doubled Nd:YAG (532 nm and 250 mJ/pulse at 10 Hz)
- Lexel Dye Laser (Argon-pumped) - Tunable 500-850 nm (*)
- He-Ne (632 nm and 17 mW)
- DPSS (980 nm and 0.1 - 4.8 W)
- Nd:YAG (1064 nm and 450 mJ/pulse at 10 Hz)
(*) Curently being installed. Output power has not being verified yet.
The samples luminescence is collected by high-efficiency UV-grade mirrors and focused on the entrance slit of the triple-grating spectrometer. The spectrometer is equipped with high-sensitivity TE-cooled CCD (300-1000nm) and InGaAs (700-1650nm) cameras. The 6 gratings available allow for either high-throughput or high spectral resolution measurements over the entire (300-1650nm) spectral range.
