PARAMAGNETIC RESONANCE IN THE SOLID STATE.
Final rept., 1 Jan-30 Jun 65,
NEW YORK UNIV N Y RADIATION AND SOLID STATE LAB
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The relationship between fluorescence, fluorescence quenching, light stimulation, glow areas, and the photo-induced EPR signals in excited Cr, Cu activated ZnS phosphors was studied. Two types of trap levels exist deep traps due to chromium and shallow traps located in the neighborhood of ionized Cu activators their trap populations are determined. Electron in both types of traps respond to IR but with a quite different IR wavelength dependence. IR shifts electrons from deep to shallow levels heating shifts them in the reverse direction. IR raises electrons from deep traps into the conductivity level and is also absorbed by the ionized activators. The latter absorption gives rise to light stimulation or quenching. Author
- Electricity and Magnetism
- Solid State Physics