Abstract: An organic electroluminescent device of the type comprises an organic layer 5, 5a or 5b having a luminescent region and provided between an anode 2 and a cathode 3. The organic layer contains a distyryl compound represented by the following general formula (1). Chemical Formula 1 general formula (1): wherein R1, R2, R3 and R4 are, respectively, groups which may be the same or different and independently represent an aryl group of the following general formula (2). general formula (2): in which R9, R10, R11, R12 and R13 may be the same or different and, respectively, represent a hydrogen atom provided that at least one of them is a saturated or unsaturated alkoxyl group or an alkyl group, and R5, R6, R7 and R8 may be the same or different and, respectively, represent a hydrogen atom provided that at least one of them represents a cyano group, a nitro group or a halogen atom.

Abstract: A method of recycling a disk recording medium includes the steps of retaining the disk recording medium in a liquid medium, the disk recording medium having a layered structure including a substrate, a dye layer, a reflective film, and a protective layer; radiating ultrasonic waves onto the disk recording medium such that the substrate and the reflective film are separated from each other; and bringing a solution into contact with the substrate separated from the reflective film such that the dye layer is separated from the substrate in order to recover the substrate, the solution dissolving the dye layer.

Abstract: The present invention provides a process for efficient recovery of dyestuffs from dye-based optical disks, and to provide a solvent used for recovery. Disclosed herein is a process for recovering dyestuffs from dye-based optical disks by treating the dyestuff-containing layer with a solvent containing a singlet oxygen quencher. Disclosed also herein is a solvent for dyestuff recovery which contains a singlet oxygen quencher.