Patent ID: 6703146
Filing Date: 2004-03-09
Classification: H01L,Y10S

Abstract:
An organic electroluminescent device comprising at least two organic compound layers consisting of a luminescent layer emitting a blue light and at least one layer selected from an electron injection layer or an electron transporting layer between heteropolar electrodes,wherein the electron injection or electron transporting layer has an ionization potential higher than that of the luminescent layer; the electron injection or electron transporting layer comprises a compound represented by a general formula (1): where M represents a metal atom; R1 to R6, which may be different or the same, are a group independently selected from the group consisting of hydrogen atom, and halogen, alkyl, alkoxy and cyano group; L represents a ligand having a radical selected from the group consisting of halogen group, substituted or unsubstituted alkoxy group, aryloxy group, and alkyl group; and n represents 1 or 2, provided that when n is 2, groups represented by the same symbol among R1 to R6 may be different or the same; the electron transporting layer has an ionization potential of at least 5.9 eV; and the luminescent layer comprises a compound represented by a general formula (2) or (3) or (3a): where R1 to R4 independently represent hydrogen atom, alkyl group, alkoxy group, aryl group, aryloxy group, amino group, and cyano group; and when n is more than one, groups represented by a common symbol among R1 to R4 on different rings may be different or the same; R5 and R6 independently represent an optionally substituted aryl with 6 to 12 carbon atoms; and n is an integer of 3 to 6, where M represents a metal atom; R11 to R19, which may be different or the same, independently represent a group selected from groups consisting of hydrogen atom, halogen group, alkyl group, alkoxy group, aryl group, and aryloxy group; R11 to R14 or R15 to R19 may be combined together to form a saturated or unsaturated ring; Ra is a group which may be substituted as in R11 to R19, Rb is a hetero atom, and Ra and Rb may be independently or mutually combined to form a hetero ring; n represents 2 or 3; and R represents a bivalent group.