Patent ID: 8617725

Claim:
A light emitting device comprising: a first anode; a first light emitting layer over the first anode; a second light emitting layer in direct contact with the first light emitting layer; a first cathode over the second light emitting layer; a second anode over and in direct contact with the first cathode; a third light emitting layer over the second anode; and a second cathode over the third light emitting layer, wherein each of the first to third light emitting layers has a maximum emission peak, wherein each of the maximum emission peaks is located in one of a first wavelength region of greater than or equal to 400 nm and less than 500 nm, a second wavelength region of greater than or equal to 500 nm and less than 600 nm, and a third wavelength region of greater than or equal to 600 nm and less than 700 nm, wherein each of the first to third wavelength regions has only one of the maximum emission peaks, wherein one of the first and second light emitting layers comprises an anthracene derivative represented by a general formula (I): and wherein: Ar 1 and Ar 2 individually represent an aryl group having 6 to 25 carbon atoms; Ar 3 represents an arylene group having 6 to 25 carbon atoms; A represents any of substituents represented by general formulae (1-1) to (1-3), Ar 11 to Ar 13 individually represent an aryl group having 6 to 25 carbon atoms; Î± represents an arylene group having 6 to 25 carbon atoms; Ar 21 represents an aryl group having 6 to 25 carbon atoms; R 31 represents any of a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an aryl group having 6 to 25 carbon atoms, and a haloalkyl group having 1 to 4 carbon atoms; R 32 represents any of an alkyl group having 1 to 4 carbon atoms, an aryl group having 6 to 25 carbon atoms, and a haloalkyl group having 1 to 4 carbon atoms; Ar 31 represents an aryl group having 6 to 25 carbon atoms; Î² represents an arylene group having 6 to 25 carbon atoms; and R 41 and R 42 individually represent any of a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an aryl group having 6 to 25 carbon atoms, and a haloalkyl group having 1 to 4 carbon atoms.