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.

Disclosed herein are metal compounds useful in devices, such as, for example, OLEDs.

Provided are a fluorescent probe, a preparation method therefor and a use thereof. The fluorescent probe sensitively and specifically responds to viscosity, and can be used for the specific fluorescence labeling of proteins as well as in the quantification, detection or kinetic study of proteins and the imaging of cells, tissues and living bodies.

A compound having the formula [L.sub.A].sub.3-nIr[L.sub.B].sub.n is disclosed. In the formula, L.sub.A is ##STR00001##
and L.sub.B is Formula I ##STR00002##

The present disclosure relates to an organic metal compound, an organic light emitting diode and an organic light emitting device having the compound, in particular, to an organic metal compound having the following structure of Formula 1, an organic light emitting diode (OLED) and an organic light emitting device that includes the organic metal compound. The OLED and the organic light emitting device including the organic metal compound can improve their luminous efficiency, luminous color purity and lifespan.

Ir(L.sub.A).sub.m(L.sub.B).sub.n  [Formula 1]

The present application relates to alkylpyridinium substituted coumarin dyes and their uses as fluorescent labels. For example, these dyes may be used to label nucleotides for nucleic acid sequencing applications.

The present disclosure relates to organic electroluminescent compounds and an organic electroluminescent device comprising the same. The organic electroluminescent compound according to the present disclosure may be comprised in a light-emitting layer or an electron buffer layer, and is effective to produce an organic electroluminescent device having low driving voltage, excellent current and power efficiencies, and significantly improved operative lifespan.

An aromatic amine derivative represented by formula (1): ##STR00001##
wherein R.sup.1, R.sup.2, R.sup.3, L, Ar.sup.1, Ar.sup.2, k, m, and n are the same as defined in the specification, is useful as a material for an organic EL device and realizes an organic EL device with a high efficiency and a long lifetime even when driving it at a low voltage.