INVESTIGATION ON SEMICONDUCTING DIAMONDS.
SOREQ RESEARCH ESTABLISHMENT ISRAEL ATOMIC ENERGY COMMISSION YAVNEH
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Some luminescence phenomena typical of semiconducting diamonds was investigated. The main thermoluminescent and phosphorescent emission was found to be blue the TL peaks appeared at 150K and 260K, as observed in the case of photoluminescence and electroluminescence. The blue emission was excited by uv light between 2250A and 4000A. Excitation of the 260K peak was superlinear for some excitation wavelengths, and this peak could not be bleached by infrared light. The 150K peak intensity seemed to be linear with the dose, and under certain conditions bleaching effects appeared. Visible and infrared light applied to the crystal before the uv irradiation caused an interesting change in the blue TL peak intensities, reducing the intensity of the 150K peak and enhancing sometimes quite markedly the 260K one. Red peaks at 175K and 280K could be excited by uv and visible light, the excitation being linear or sublinear with dose. Decay curves of phosphorescence were of the Becquerel form, with the power varying between 0.5 and 1.5. These results have an important bearing on the energy levels in the forbidden energy gap of semiconducting diamonds, and on transitions between them. A possible use of these phenomena is as a relatively easy means of selecting the rare semiconducting samples among which are the blue diamonds, out of the common diamond variety. Author
- Solid State Physics