Multiplication Processes of Electronic Excitations in PbCl_2 Crystals Exited by Vacuum Ultraviolet Radiation

概要

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The excitation spectra for two intrinsic luminescence hands at 3.76eV (UV) and 2.62eV (BG) inPbCl_2 have hcen measured using synchrotron radiation in the energy range up to 25eV at 10K. Since the UV and BG hands are connected to excitonic luminescence and electron-hole (e-h) recombination luminescence, respectively, an analysis of the difference in their excitation spectra allows us to separate excitonic and e-h mechanisms in the multiplication of electronic excitations. It is found that the intensityof the UV emission is sharply increased at 9.8eV, which is higher than twice the band gap energy. Secondary cxcitons are formed by inelastic scattering of hot photoelectrons in the region above 9.8eV. On the other hand, the BG emission is gradually enhanced in the range of 9-12.5eV, and the intensity doubles at around 12.5eV. This result indicates that the creation of two e-h pairs per photon predominantly causes in the region above 12.5eV. The e-h multiplication originates not only in inelastic scattering of hot photoelectrons in the 12.5-25eV range but also in interband Auger recombination of holes in the Cl core levels with valence electrons in the 18-25eV range.
社団法人日本物理学会の論文
2003-03-15