Accession Number : AD0631044

Title :   OPTICAL AND ELECTRICAL PROPERTIES OF DIAMOND.

Descriptive Note : Annual summary rept. no. 2, 1 Nov 64-31 Oct 65,

Corporate Author : SOREQ RESEARCH ESTABLISHMENT ISRAEL ATOMIC ENERGY COMMISSION YAVNEH

Personal Author(s) : Halperin,A.

Report Date : 31 OCT 1965

Pagination or Media Count : 11

Abstract : THERMOLUMINESCENCE OF SEMICONDUCTING AND INSULATING DIAMONDS: Glow curves showed peaks near 150 and 250 degrees K. Blue thermoluminescence could be excited by wavelengths up to 0.4 micron. Red -emitting glow peaks were found at 175 and 290 K that could be excited up to about 0.6 micron. DARK CURRENT AND PHOTOCONDUCTIVITY IN SEMICONDUCTING DIAMOND: Direction of rectification between 80 and 373 K indicated p-type conductivity. ELECTROLUMINESCENCE (EL) OF SEMICONDUCTING DIAMONDS: At low temperature the emission spectrum was mainly blue, the red becoming comparatively stronger at higher temperature. Plots of the log of the EL brightness vs 1/square root of V gave 2 straight lines differing in slope, with higher slope at higher voltages. EL was observed with voltages smaller than the 5.5-ev band gap. THEORETICAL INVESTIGATIONS (see also AD-621 037, AD-621 038): Kinetics of luminescence were investigated when electrons are excited to the conduction band before falling to a center and when transition is through a discrete excited state.

Descriptors :   (*DIAMONDS, OPTICAL PROPERTIES), (*SEMICONDUCTORS, ELECTRICAL PROPERTIES), (*LUMINESCENCE, SEMICONDUCTORS), ELECTROLUMINESCENCE, THERMAL PROPERTIES, PHOTOCONDUCTIVITY, FREQUENCY, KINETIC THEORY, ELECTRICAL CONDUCTIVITY, LOW TEMPERATURE, ISRAEL

Subject Categories : Crystallography
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE