A metal complex (1) is useful for producing a light emitting device having excellent external quantum efficiency.

##STR00001##

M represents Ir; n.sup.1 is 1 or more; n.sup.1+n.sup.2 is 3; E.sup.1 and E.sup.2 are nitrogen or carbon atoms; Ring L.sup.1 represents an aromatic hetero ring; Ring L.sup.2 represents an aromatic hydrocarbon or an aromatic hetero ring; A.sup.1-G.sup.1-A.sup.2 represents an anionic bidentate ligand, and Ring L.sup.1 or Ring L.sup.2 has a group (2).

##STR00002##

R.sup.3 represents an alkyl group; R.sup.4 to R.sup.8 are each a hydrogen atom or an alkyl group; X represents an arylene group; k.sub.1 represents 0 to 3. When (1) has only one type of (2), (i) is satisfied: (i) Ring L.sup.1 is a monocyclic 5-membered aromatic hetero ring; and at least one Ring L.sup.2 has formula (2) where R.sup.3 is a phenyl group, R.sup.4 is a hydrogen atom, and R.sup.3 and R.sup.4 are combined to form a fluorene ring.

The present invention relates to a polycyclic aromatic derivative and an electroluminescent device comprising same. The electroluminescent device according to the present invention comprises a polycyclic aromatic derivative as a dopant compound in a light-emitting layer thereof and also employs an anthracene derivative having a characteristic structure, as a host in combination therewith, in the light-emitting layer, whereby the electroluminescent device can have excellent color purity, high light-emitting efficiency, and a remarkably improved long lifespan, and thus can be advantageously used in various display devices.

A method for preparing a sensitizing material and an organic light emitting diode are provided, the method including: adding C.sub.24H.sub.16Br.sub.2P.sub.2 and dichloromethane to a hydrogen peroxide solution to react therewith, dissolving a reactant in a dichloromethane solution and subjecting the solution to a purification with a first silica gel column; adding a purified product, a predetermined electron donor material, palladium acetate, and tri-tert-butylphosphine tetrafluoroborate in sodium tert-butoxide and toluene to react; extracting with dichloromethane and purified by a second silica gel column.

The present disclosure relates to a composition for cell imaging, including a fluorescent probe compound, and a method of cell-material imaging using the same.

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 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.

Provided are transition metal compounds having 1,2,3-triazine. Also provided are formulations comprising these transition metal compounds having 1,2,3-triazine. Further provided are OLEDs and related consumer products that utilize these transition metal compounds having 1,2,3-triazine.

The present disclosure relates to an organometallic compound in Formula below and an organic light emitting diode and an organic light emitting device including the organometallic compound. The organometallic compound provides high emitting efficiency and longer lifespan, and the organic light emitting diode and the organic light emitting device have advantages in the emitting efficiency and the lifespan.

##STR00001##

A composition which is useful for producing a light emitting device having excellent light emission efficiency and a light emitting device containing the composition are described. The light emitting device contains an anode, a cathode, and an organic layer disposed between the anode and the cathode and contains a composition containing a metal complex represented by the formula (2), and a compound (B) having a condensed hetero ring skeleton (b) containing a boron atom and at least one selected from the group consisting of an oxygen atom, a sulfur atom, a selenium atom, an sp.sup.3 carbon atom and a nitrogen atom in the ring.

##STR00001##

Provided are OLEDs and related electronic devices that utilize these OLED devices. The OLED includes an emissive region that includes a sensitizer and an acceptor, where the sensitizer has a lowest excitation energy state E.sub.T1, and is capable of harvesting triplet excitons; where the acceptor is capable of receiving energy from the sensitizer and functioning as a fluorescent emitter at room temperature; where the acceptor has a first moiety and a second moiety, the first moiety having a lowest singlet excitation energy state E.sub.S1.sup.A and a lowest triplet excitation energy state E.sub.T1.sup.A, and the second moiety having a lowest singlet excitation energy state E.sub.S1.sup.B and a lowest triplet excitation energy state E.sub.T1.sup.B; and where E.sub.S1.sup.A<E.sub.S1.sup.B, E.sub.T1.sup.A>E.sub.T1.sup.B, and E.sub.T1>E.sub.S1.sup.A.