Temperature Dependence of Edge Emission in Single-Crystal Cadmium Sulfide

The temperature dependence of the two series of edge emission lines in single-crystal CdS has been studied in the range of 4.2 to 350^∘{}K. The "blue" or short-wavelength lines persist to 350^∘{}K, and at least three bands are directly associated with the low-temperature lines. The shortest wavelength band has a peak at 5092 {} at 300^∘{}K and is associated with line B₁¹ of Pedrotti and Reynolds which appears at 4853 {} at 4.2^∘{}K. The slope of the curve of wavelength versus temperature of this line is quite linear in the temperature range 175 to 350^∘{}K with slope of 6×{}10^-4 eV/^∘{}K. At lower temperatures the slope becomes less and in the range 4.2 to 100^∘{}K is 2×{}10^-4 eV/^∘{}K. In the case of the green fluorescence, under stimulation by 250-keV electrons at a current of 5 {μ}A/cm², there is a band with a peak intensity at 5490 {} at 300^∘{}K. At 77^∘{}K the peak intensity of this band is at 5250 {}. The intensity of the band is three orders of magnitude less at 300^∘{}K than at 77^∘{}K.