Abstract: A novel red fluorescent material of formula (I) of the present invention has an improved thermostability, and an organic electroluminescent device containing the fluorescent material of formula (I) can provide color ranging from orange to deep red.

Abstract: An organometallic luminescent material comprising the compound of formula (I) of the present invention can emit pure blue light and have high thermal stability: wherein, M1 is a monovalent or tetravalent metal selected from the group consisting of Li, Na, K, Zr, Si, Ti, Sn, Cs, Fr, Rb, Hf, Pr, Pa, Ge, Pb, Tm and Md; R is hydrogen or C1-10 alkyl; B is O, S, Se or Te; D is O or S; and n is an integer ranging from 1 to 4.

Abstract: An organometallic luminescent material including the compound of formula (IV) emits pure green light and has a high thermal stability: wherein, M4 is a monovalent metal selected from the group consisting of Li, Na, and K; R is hydrogen or a C1-10 alkyl; D is O or S; and n is an integer ranging from 1 to 4.

Abstract: An electroluminescent device comprising a transparent electrode layer, a metallic electrode layer, and an organic interlayer disposed between, and in close contact with, the electrode layers wherein the organic interlayer is comprised of an organic luminescent layer, an optional hole transport layer and an optional electron transport layer, and contains a polyimide of formula (I): wherein A is a moeity derived from a dianhydride compound; B is a moiety derived from a diamine compound; and n is an integer of 2 or higher.

Abstract: A process for preparing an organic electroluminescent device having a transparent substrate, a transparent electrode layer, a metallic electrode layer, and an organic interlayer containing an electronically active material dispersed in a matrix of polyimide, characterized in that the organic interlayer is prepared by depositing the vapors of a dianhydride, a diamine and the electronically active material to form a polyimide precursor layer containing the active material dispersed therein and thermally imidizing the polyimide precursor layer. The organic luminescent device thus obtained has improved luminous efficiency, thermal stability, interfacial surface roughness and high bulk density of the layer.

Abstract: An organometallic luminescent material selected from the group consisting of the compounds of formulae (I) to (V) of the present invention can emit blue, green and red lights.

Abstract: An organometallic luminescent material selected from the group consisting of the compounds of formulae (I) to (V) of the present invention can emit blue, green and red lights.

Abstract: An organometallic luminescent material selected from the group consisting of the compounds of formula (I) to (V) of the present invention can emit blue, green and red lights.

Abstract: A novel diamine compound of formula (I) of the present invention having a high glass transition temperature is useful as an improved hole transport agent, and an organic electroluminescent device containing the diamine compound of formula (I) has good thermal and mechanical stabilities, and prolonged lifetime.

Abstract: A novel diamine compound of formula (I) of the present invention having a high glass transition temperature is useful as an improved hole transport agent, and an organic electroluminescent device containing the diamine compound of formula (I) has good thermal and mechanical stabilities, and prolonged lifetime.