The present invention relates to a compound of the formula (I), (II) or (III), to the use of the compound in an electronic device, and to an electronic device comprising a compound of the formula (I), (II) or (III). The present invention furthermore relates to a process for the preparation of a compound of the formula (I), (II) or (III) and to a formulation comprising one or more compounds of the formula (I), (II) or (III).

Tridentate platinum, palladium, and gold complexes of Formulas A-I and A-II and tridentate iridium and rhodium compounds of Formulas B-I, B-II, and B-III suitable for delayed fluorescent and phosphorescent or phosphorescent emitters in display and lighting applications. ##STR00001## ##STR00002##

Described herein are molecules for use in organic light emitting diodes. Example molecules comprise at least one moiety A and at least one moiety D. Values and preferred values of the moieties A and D are described herein. The molecules comprise at least one atom selected from Si, Se, Ge, Sn, P, or As.

A polycyclic compound according to an embodiment of the inventive concept is represented by the following Formula 1:

##STR00001##

In Formula 1, Ar.sub.1 and Ar.sub.2 are each independently substituted or unsubstituted aryl group having 6 to 30 carbon atoms for forming a ring, or substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms for forming a ring, where Ar.sub.1 and Ar.sub.2 may combine with each other to form a ring, and A is represented by the following Formula 2-1 or 2-2:

##STR00002##

A novel compound capable of producing an organic electroluminescence (EL) device with excellent properties, an organic EL device comprising the compound, and an electronic device comprising the organic EL device are provided.

A compound represented by formula (1), an organic EL device comprising the compound, an organic EL device comprising an organic thin film layer between a cathode and an anode, wherein the organic thin film layer comprises one or more layers and a light emitting layer and at least one layer of the organic thin film layer comprises the compound, and an electronic device comprising the organic EL device:

##STR00001##

wherein A, B, C, and R.sub.1 to R.sub.11 are as defined in the description.

New composition of polymeric scintillator was revealed, which can be used particularly in medical diagnostics especially in productions of CT scanners, PET scanners and SPECT scanners.

Provided are near-infrared nerve-sparing fluorescent compounds, compositions comprising them, and methods of their use in medical procedures.

A compound and an organic optoelectronic device are provided. The compound has the following chemical formula (I):

##STR00001##

chemical formula (I). In the chemical formula (I), X.sub.1 to X.sub.2 are independently selected from O, S,

##STR00002##

and substituted or unsubstituted methylene, and a substituent is selected from hydrogen, deuterium, C.sub.1 to C.sub.30 alkyl, C.sub.1 to C.sub.30 heteroatom-substituted alkyl, C.sub.6 to C.sub.30 aryl, and C.sub.2 to C.sub.30 heteroaryl. X.sub.3 is selected from O, S, substituted or unsubstituted methylene, substituted or unsubstituted methylene, and substituted or unsubstituted silylene, and a substituent is selected hydrogen, deuterium, C.sub.1 to C.sub.30 alkyl, C.sub.1 to C.sub.30 heteroatom-substituted alkyl, C.sub.6 to C.sub.30 aryl, and C.sub.2 to C.sub.30 heteroaryl. R.sub.1 to R.sub.17 are independently selected from hydrogen, deuterium, C.sub.1 to C.sub.30 alkyl, C.sub.1 to C.sub.30 heteroatom-substituted alkyl, C.sub.6 to C.sub.30 aryl, and C.sub.2 to C.sub.30 heteroaryl.

An organic electroluminescence device includes: an anode; a cathode; an emitting layer provided between the anode and the cathode, in which the emitting layer contains a delayed fluorescent compound M2 and a compound M3 represented by a formula (3), and a singlet energy S.sub.1(M2) of the compound M2 and a singlet energy S.sub.1(M3) of the compound M3 satisfy the relationship S.sub.1(M3)>S.sub.1(M2). In the formula (3), A.sub.30 is a group represented by a formula (3a) or the like.

##STR00001##

An organic light-emitting device including a first electrode, a second electrode facing the first electrode, and an organic layer disposed between the first electrode and the second electrode, wherein the organic layer comprises an emission layer and satisfies Equations 1 and 2,

E.sub.T1(HOST)−E.sub.T1(AD)>0.05 eV  Equation 1

E.sub.S1(FD)−E.sub.S1(AD)<0 eV,  Equation 2 wherein in Equation 1, E.sub.T1(HOST) is a triplet energy (eV) of the host, and E.sub.T1(AD) is a triplet energy (eV) of the auxiliary dopant, and wherein in Equation 2, E.sub.S1(FD) is a singlet energy (eV) of the fluorescent dopant, and E.sub.S1(AD) is a singlet energy (eV) of the auxiliary dopant, wherein the emission layer comprises a host, an auxiliary dopant, and a fluorescent dopant, and wherein the auxiliary dopant is selected from compounds represented by Formula 1:

##STR00001## wherein in Formula 1, Ar.sub.1 and R.sup.11 to R.sup.16 are the same as described in the specification.