| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high-sensitivity optical recording medium by setting the gap Tauc corresponding to the energy gap in an amorphous state to a specified range in an amorphous phase of a recording material, esp., after forming films. SOLUTION: Using a recording material having a gap Tauc obtained from the light absorption spectrum due to transition of its amorphous phase between bands or an optical gap of 0.18-0.58 eV, a recording medium capable of efficiently absorbing red or blue-green semiconductor laser lights at a high sensitivity and easily initially crystallizable is realized. The material having a gap Tauc ranging from 0.18 eV to 0.58 eV is mainly composed of Ag, In, Sb, Te, Ho and N, esp. N controls the gap Tauc which is changeable by the N quantity according to designs, thus leading to a high sensitivity, improved preserve characteristics, improved repetition characteristic, etc. |
