| 摘要 |
A pyrromethene metal complex of formula (1) is used as a fluorescent dye to form a light emitting device. The light emitting device includes a material which brings about light emission between an anode and a cathode. By applying electrical energy, the device generates emission having an emission peak wavelength of 580 to 720 nm. The device contains at least one of: a diketopyrroloÄ3,4-cÜpyrrole derivative and an organic fluorescent material having a fluorescent peak wavelength of 580 to 720 nm; and a light emitting device composition containing a pyrromethene metal complex of formula (1). Formula (1) is <CHEM> wherein each of R<1>, R<2> and the or each L, independently of each other, is a group selected from hydrogen, alkyl, cycloalkyl, aralkyl, alkenyl, cycloalkenyl, alkynyl, hydroxyl, mercapto, alkoxy, alkylthio, aryl ether, aryl thioether, aryl, heterocyclic, halogen, haloalkane, haloalkene, haloalkyne, cyano, aldehyde, carbonyl, carboxyl, ester, carbamoyl, amino, nitro, silyl, siloxanyl, and fused aromatic and alicyclic rings each formed with an adjacent group selected from Ar<1> to Ar<4> and M is a metal having a valence of m and is selected from boron, beryllium, magnesium, chromium, iron, nickel, copper, zinc, and platinum; and each of Ar<1> to Ar<5>, independently of each other, is an optionally substituted aryl group. |
