A compound of formula (1)

##STR00001##

wherein X.sub.1 is CR.sub.1 or a nitrogen atom, X.sub.2 is CR.sub.2 or a nitrogen atom, X.sub.3 is CR.sub.3 or a nitrogen atom, X.sub.4 is CR.sub.4 or a nitrogen atom, X.sub.5 is CR.sub.5 or a nitrogen atom, X.sub.6 is CR.sub.6 or a nitrogen atom, X.sub.7 is CR.sub.7, a nitrogen atom, or a carbon atom single-bonded to X.sub.8, X.sub.8 is CR.sub.8, a nitrogen atom, or a carbon atom single-bonded to X.sub.7, X.sub.9 is CR.sub.9 or a nitrogen atom, X.sub.10 is CR.sub.10 or a nitrogen atom, X.sub.11 is CR.sub.11 or a nitrogen atom, X.sub.12 is CR.sub.12 or a nitrogen atom, and Q is CR.sub.Q or a nitrogen atom, and Y is NR.sub.Y1, an oxygen atom, a sulfur atom, C(R.sub.Y2)(R.sub.Y3) or Si(R.sub.Y4)(R.sub.Y5), each R being a hydrogen atom or a substituent.

An organic electroluminescence device of an embodiment includes a first electrode, a second electrode and a plurality of organic layers disposed between the first electrode and the second electrode, in which at least one of the organic layers includes a polycyclic compound including a plurality of electron donors and an electron acceptor connecting the electron donors, at least one of the electron donors is a condensed ring including a borepine core, and the electron acceptor includes a phenyl group including, as a substituent, at least one cyano group or a heterocycle including at least one nitrogen atom, or a heteroaryl group including an oxygen atom or a sulfur atom for forming a ring, thereby achieving improved emission efficiency.

Provided is a blue light emitting organic EL device having high emission efficiency and a long lifetime.

An organic electroluminescent device comprising one or more light emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light emitting layers contains an organic emission material having a difference between excited singlet energy (S1) and excited triplet energy (T1) (ΔEST) of 0.20 eV or less as a light emitting dopant, a first host selected from the compounds represented by the following general formula (1), and a second host selected from the compounds represented by the following general formula (2).

##STR00001##

An organic borane complex contains, as a component, triarylborane having an enhanced bonding between a boron atom and a carbon atom on an aryl group. The organic borane complex contains, as a component, triarylborane having a structure represented by the following general formula (1), wherein X1 and X2 each independently represent an oxygen atom or a sulfur atom; X3 and X4 each independently represent a hydrogen atom or a substituent, or X3 and X4 are linked together to be a single atom; R1 to R3 each independently represent a hydrogen atom or a substituent; and p, q and r each independently represent an integer of 1 to 3. Also disclosed are a composition containing organic borane, and an organic electroluminescent element.

Provided organic light emitting device (OLED) comprising compounds having Formula I:

##STR00001##

wherein rings A, B, C, D, E, and F are each independently a single or fused ring system, consisting of one or more 5-membered or 6-membered carbocyclic or heterocyclic rings; L.sup.1, L.sup.2, L.sup.3, L.sup.4, L.sup.5, and L.sup.6 are each independently optionally present or is selected from the group consisting of O, S, Se, BR, BRR′, NR, C═R, CRR′, SiRR′, P(O)R, and GeRR′; a, b, c, d, e and f are each 0 for not present or 1 for present; each of R, R′, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, and R.sup.6 is independently a hydrogen or a substituent; and any two of adjacent R, R′, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, and R.sup.6 can be joined or fused to form a ring. The compound is an ETL.

A light emitting device that includes a first electrode, a second electrode facing the first electrode, and an emission layer between the first electrode and the second electrode is provided. The emission layer includes a first compound represented by Formula 1, and at least one of a second compound represented Formula H-1, a third compound represented Formula H-2, or a fourth compound represented Formula D-2, thereby exhibiting improved luminous efficiency characteristics.

A light emitting element includes a first electrode, a second electrode disposed on the first electrode, and an emission layer disposed between the first electrode and the second electrode. The emission layer may include a first compound represented by Formula 1, and at least one of a second compound, a third compound, and a fourth compound. The light emitting element including the first compound represented by Formula 1 exhibits high efficiency and a long lifespan.

##STR00001##

Provided are a condensed cyclic compound and an organic light-emitting device including the same. The organic light-emitting device may include a first electrode, a second electrode, and an organic layer disposed between the first electrode and the second electrode. The organic layer may include the condensed cyclic compound represented by Formula 1: ##STR00001## In Formula 1, rings A.sub.1, A.sub.2, and A.sub.3 may each be independently a C.sub.5-C.sub.60 carbocyclic group or a C.sub.2-C.sub.30 heterocyclic group, and n1 to n3 may each be independently 0 or 1, provided that the sum of n1, n2, and n3 is 1. In addition, the descriptions of X.sub.1, L.sub.1 to L.sub.9, a1 to a9, Ar.sub.1 to Ar.sub.6, b1 to b6, R.sub.1 to R.sub.3, and c1 to c3 are as defined in the present specification.

The present invention relates to compounds of the formula (1) which are suitable for use in electronic devices, in particular organic electroluminescent devices, and to electronic devices which comprise these compounds.

The present invention relates to the field of display technologies, and particularly to a fused polycyclic compound, a preparation method and use thereof. The fused polycyclic compound provided in the present invention has a structure of General Formula IV. The structure of the compound has ambipolarity, and the HOMO level and the LUMO level of the host material are respectively located on different electron donating group and electron withdrawing group, such that the transport of charges and holes in the host material becomes more balanced, thereby expanding the area where holes and electrons are recombined in the light emitting layer, reducing the exciton concentration, preventing the triplet-triplet annihilation of the device, and improving the efficiency of the device.