Ga2O3 has shown 3 direct allowed transitions of different energy in the a,b and c-axes. When measuring the bandgap with polarized light, each of these transitions can be probed so you can observe different bandgaps with a Tauc plot ~ 4.2-5.12 eV. My question is if these different direct-allowed transitions could produce different scintillation emissions from either photoluminescence or cathodoluminescence?
Hello Jacob,
absorption measurements (tauc plot) can give precise informations concerning the band structure of materials. You can vary energy, polarization and k-value of incident radiation.
Luminescence gives integral information. Cathodoluminescence excites electrons in a quasi free state (ionizes the material). The charges then thermalize into band states with different probabilities and recombine as a function of their different lifetimes into the ground state. Photoluminescence is more precise because the start state depends on energy, polarization and selection rules. No "inclined" transitions are possible.The end state after thermalization therefore differ from cathodoluminescence.
With Regard
R. Mitdank
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