Photochemical hole burning media
A photochemical hole burning medium is composed of a material in which a rare earth complex and a reducing agent is dispersed in a solid matrix. The rare earth complex may be at least one complex selected from the group consisting of a europium (III) crown ether complex, a europium (III) polyether complex, and a europium (III) cryptand complex.
1. A photochemical hole burning medium, comprising a material in which a rare earth complex and a reducing agent are dispersed in a solid matrix; wherein
the photochemical hole burning medium is used at low temperatures; and
said rare earth complex is at least one complex selected from the group consisting of a europium (Ill) crown ether complex, a europium (III) polyether complex, and a europium (III) cryptand complex,
wherein said reducing agent is an organic tin compound represented by RSnSnR in which R is an alkyl group or an aryl group.
2. The photochemical hole burning medium set forth in claim 1 , wherein said solid matrix is at least one glass-forming compound selected from the group consisting of silica, germanium oxide, boron oxide, phosphorus pentaoxide and tellurium oxide.
3. The photochemical hole burning medium set forth in claim 2 , wherein at least one compound selected from the group consisting of Al 2 O 3 , Ga 2 O 3 , In 2 O 3 , TiO 2 , ZrO 2 , Nb 2 O 5 and Ta 2 O 5 is contained in said solid matrix.
4. The photochemical hole burning medium set forth in claim 1 , wherein the reducing agent has an oxidation/reduction potential of not more than 1 V.