The present invention relates to an organometal-complex luminescent material which has a structural formula (I), wherein A, B and C refer to substituted or unsubstituted C, N, O and S atoms independently; a dashed ring for linkage between A and B atoms refers to a substituted or unsubstituted conjugated ring structure; L1, L2, L3 and L4 are single bonds or double bonds independently, wherein L3 and L4 are part of the conjugated ring structure for linkage between A and B atoms; X, X1, Y and Y1 are C, N, O and S atoms independently; Ar1 and Ar2 are substituted or unsubstituted conjugated ring structures independently; M refers to Pt, W and Au atoms. An organometal complex in the luminescent material is high in fluorescence quantum efficiency and heat stability and low in quenching constant and can be used for manufacturing high-efficiency and low-efficiency roll-off red-light OLEDs. ##STR00001##

The present invention addresses the problem of providing: a luminescent thin film, a luminescent multilayered film, and an organic electroluminescent element that have luminescence properties with excellent storage stability in atmospheric air; and a production method therefor. This luminescent thin film contains a luminescent compound A, and is characterized by containing 0.0001 mass % or more of an oxide B of luminescent compound A in terms of the luminescent compound A.

Provided are an electroluminescent compound having a structure represented by Formula I, a thermally activated delayed fluorescence material and an application thereof. The electroluminescent compound has TADF characteristics and may be applied to a light emitting layer of an OLED device as a thermally activated delayed fluorescence material. The OLED device includes an anode, a cathode, and at least one organic thin film layer comprising the thermally activated delayed fluorescence material in a light emitting layer between the anode and the cathode. The electroluminescent compound effectively reduces the overlap between HOMO and LUMO through special molecular structure design, so that ΔE.sub.ST is reduced to less than 0.25 eV, which satisfies reverse crossing of energy from a triplet state to a singlet state, effectively improves transmission capacities of two kinds of carriers, improves carrier balance, and thus significantly improves light emitting efficiency of the OLED device.

The present disclosure provides a compound having a formula (I): ##STR00001##
where A represents a nitrogen-containing heteroaromatic ring substituent; and L is one or more selected from a single bond, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C3-C8 cycloalkyl, substituted or unsubstituted C1-C8 alkoxy, substituted or unsubstituted C3-C8 heterocyclyl, substituted or unsubstituted C6-C40 aryl, and substituted or unsubstituted C4-C40 heteroaryl.

Presented is an organic light-emitting device including a host, a dopant, and a sensitizer.

Provided are an organic electroluminescence device, which shows high luminous efficiency, is free of any pixel defect, and has a long lifetime, and a material for an organic electroluminescence device for realizing the device. The material for an organic electroluminescence device is a compound having a π-conjugated heteroacene skeleton crosslinked with a carbon atom, nitrogen atom, oxygen atom, or sulfur atom. The organic electroluminescence device has one or more organic thin film layers including a light emitting layer between a cathode and an anode, and at least one layer of the organic thin film layers contains the material for an organic electroluminescence device.

The present invention relates to an organic electroluminescent device comprising a mixture comprising an electron-transporting host material and a hole-transporting host material, and to a formulation comprising a mixture of the host materials and to a mixture comprising the host materials. The electron-transporting host material corresponds to a compound of the formula (1) from the class of compounds containing a bispirofluorenyl unit.

A metal complex which is useful for production of a light emitting device of which long-term degradation is suppressed is provided. The metal complex is represented by the formula (1):

##STR00001##

wherein, one of Y.sup.a and Y.sup.b is a single bond, and the other is a group represented by the formula (C-1):

##STR00002##

and wherein at least one of Ring R.sup.A, Ring R.sup.B1, Ring R.sup.B2, Ring R.sup.C1 and Ring R.sup.C2 has a group represented by the formula (D-A), the formula (D-B) or the formula (D-C) as a substituent.

Provided are an organometallic compound, an organic light-emitting device including the same, and an electronic apparatus including the organic light-emitting device, the organometallic compound having a charge capture ability (CCA) of about 4.0 to about 10.5 and including a transition metal and a ligand(s) in the number of n linked to the transition metal, wherein n is an integer from 1 to 6, and the ligand(s) in the number of n includes at least one ligand linked to the transition metal through carbon, nitrogen, or a combination thereof, and the ligand(s) in the number of n does not include a ligand linked to the transition metal through two oxygens.

Provided is a compound of Chemical Formula 1:

##STR00001##

wherein: Y.sub.1 to Y.sub.9 are each independently N, C—H, C-D, or C-L′-R, provided that at least one of Y.sub.1 to Y.sub.9 is N; L′ is a single bond or a substituted or unsubstituted C.sub.6-60 arylene; R is a substituted or unsubstituted C.sub.6-60 aryl or C.sub.2-60 heteroaryl containing any one or more of N, O and S; L is a single bond, a substituted or unsubstituted C.sub.6-60 arylene, or a substituted or unsubstituted C.sub.2-60 heteroarylene containing any one or more of N, O and S; L.sub.1 and L.sub.2 are each independently a single bond or a substituted or unsubstituted C.sub.6-60 arylene; and Ar.sub.1 and Ar.sub.2 are each independently a substituted or unsubstituted C.sub.6-60 aryl or C.sub.2-60 heteroaryl containing any one or more of N, O and S;
and an organic light emitting device including the same.