Provided is a material containing at least one phosphorescent metal complex, and a compound represented by the following formula :wherein at least one of R1 to R3 is a 9-carbazolyl group which is optionally substituted or an azacarbazolyl group having 2 to 5 nitrogen atoms which is optionally substituted. The decal sheet includes an image on a surface, a decal on the image, and another image on the decal. The digestion membrane contains an immobilized protease such as trypsin, which cleaves the electroblotted proteins into fragments during electroblotting with such high enzyme cleavage capacity and efficiency that one pass of the polypeptide through the membrane is sufficient. Through the use of the present invention, a user can provide the proper amount of compressive support that is required for each area of the torso.