The M-Center Luminescence in KCl and KBr Crystals

概要

論文の詳細を見る
The M-center luminescence in KCl and KBr crystals has been investigated extensively over a temperature range from about 4°K to 370°K. From the temperature dependence of the band width of the luminescence, vibrational frequencies influencing the M center in the excited states are estimated as 3.9 × 10^<12>cps and 3.8 × 10^<12>cps, respectively, in KCl and KBr crystals. By stimulating the crystal with M_4 light almost the same luminescence as that by M_1 light is observed in KCl. New absorption bands, M_L being associated with the M center and located at 360mμ, 308mμ, 250mμ, and 400mμ, 325mμ, 275mμ in KCl and KBr crystals, respectively, have been found, which may be analogous to the L bands of the F center. By comparing with the quantum yield of the F-center luminescence, the quantum yield of the M-center luminescence is estimated as 0.37±0.05 in KCl crystals at liquid nitrogen temperature. From the temperature dependence of the M-center luminescence intensity the energy gap between the first excited state and the bottom of the conduction band is found to be 0.38±0.01eV and 0.13±0.02eV in KCl and KBr crystals, respectively.
社団法人日本物理学会の論文
1968-05-05