The present invention provides a heterocyclic compound and an organic light-emitting device including the heterocyclic compound. The organic light-emitting devices using the heterocyclic compounds have high-efficiency, low driving voltage, high luminance and long lifespan.

Organic light-emitting device

The present invention relates to novel organic electroluminescent compounds exhibiting high luminous efficiency, and organic electroluminescent devices comprising the same. The organic electroluminescent compounds according to the invention are represented by Chemical Formula (1):

Novel organic electroluminescent compounds and organic electroluminescent device using the same

Emissive phosphorescent organometallic compounds are described that produce improved electroluminescence, particularly in the blue region of the visible spectrum. Organic light emitting devices employing such emissive phosphorescent organometallic compounds are also described. Also described is an organic light emitting layer including a host material having a lowest triplet excited state having a decay rate of less than about 1 per second; a guest material dispersed in the host material, the guest material having a lowest triplet excited state having a radiative decay rate of greater than about 1×10 5 or about 1×10 6 per second and wherein the energy level of the lowest triplet excited state of the host material is lower than the energy level of the lowest triplet excited state of the guest material.

Organometallic compounds and emission-shifting organic electrophosphorescence

This short review surveys the development of red fluorescent materials for the application of organic light-emitting diodes (OLEDs) that generate red electroluminescence (EL). The merit and problems of current dopant-based, either fluorescent or phosphorescent, red OLEDs will be addressed first. Materials that offer unique EL characteristics, such as narrow and saturated red EL as well as current density or voltage-independent EL efficiency, are discussed. In addition to dopant-based and assist dopant-based red OLEDs for comparison purposes, the survey emphasizes nondoped red OLEDs that are fabricated with the newly emerging red fluorophores as the host-emitter. The advantage of host-emitting nondoped OLEDs compared with traditional dopant-based red OLEDs is described in view of the chemical and device structures of these materials.

Evolution of Red Organic Light-Emitting Diodes: Materials and Devices

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 contain these compounds.

Materials for organic electroluminescent devices

Light-emitting compounds of general formula [1], wherein each of A1 to A4 is a substituted or unsubstituted aryl group having 6 to 16 carbon atoms, and each of R1 to R8 is independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group or a substituted or unsubstituted amino group, provided that adjacent substituents may form an aryl ring useful as a light-emitting material in an organic electroluminescence device, and organic electroluminescence device containing them.

Light-emitting material for organic electroluminescence device, and organic electroluminescence device for which the light-emitting material is adapted

PROBLEM TO BE SOLVED: To improve luminous efficiency as well as brightness, and extend service life by applying the constitution that a cyclic organic compound is contained in the hole injection layer or the luminous layer of an organic electroluminescent element having a plurality of layers of organic compound thin films, containing at least a luminous layer and a hole injection layer between a pair of electrodes. SOLUTION: A cyclic organic compound is expressed by the formula, and composed, for example, by the use of a naphthoquinone derivative, a Grignard's reagent and a lithiation reagent or diaryl benzoflane. Preferably, a hole injection layer is doped into an area formed with an anode, or the compound expressed by the formula is doped into the host substance of a luminous layer having an electron injection layer in an area formed with a cathode. As a result, carriers injected from the cathode are evenly recombined within the luminous layer. In the formula, (x) represents a halogen atom, a cyano group, an alkyl group, an aryl group, an alcoxy group, an aryloxy group, an alkylthio group, a cycloalkyl group, a heterocyclic group and an amino group, and (i) represents an integer between 1 and 28. COPYRIGHT: (C)1998,JPO

Organic electroluminescent element material and organic electroluminescent element using the same

PROBLEM TO BE SOLVED: To improve the luminous intensity, luminous efficiency, and stability in repeated use by reacting a dihalide of a specified divalent residue, a secondary amine derivative, potassium carbonate and a catalyst in a solvent. SOLUTION: A dihalide of a divalent residue represented by A in formula I is reacted with a secondary amine derivative having a structure wherein the N-A bond of formula I is substituted by H, potassium carbonate and a catalyst in a solvent to give a luminescent material for an organic electroluminescent element, represented by formula I [wherein A is, e.g. an (un)substituted aromatic group, an (un)substituted condensed aromatic group [except for groups of formula II (wherein E is H, or adjacent E's may be combined to form a new six-membered aromatic ring)], or a divalent group linked through at least one nonaromatic structural unit (except for the case of formula III); Ar 1 to Ar 4 are each an (un)substituted aromatic group, or an (un)substituted condensed aromatic group; x 1 to x 4 are each -O-, -S-, >C=O, etc.; and R 1 to R 20 are each H, halogeno, an (un)substituted alkyl, an (un)substituted alkoxy, etc.]. COPYRIGHT: (C)1998,JPO

Luminescent material for organic electroluminescent element and organic electroluminescent element produced by using the same

PROBLEM TO BE SOLVED: To provide a positive hole injection material which has great positive hole injection ability, and durability, especially high-temperature-resistance, by using an organic electro-luminescence element material having a 9-phenantolyl group as a luminescent material. SOLUTION: As a luminescent material, an organic electro-luminescence element material represented by formula I is used. In the formula I, Ar -Ar show substituted or un-substituted aryl groups, and at least one is a substituted or un-substituted 9-phenantolyl group represented by formula II. In the formula II, R -R show hydrogen atoms, halogen atoms, and substituted or un-substituted alkoxyl groups, respectively and independently. Adjacent substituted groups of the R -R can combine with each other and form new saturation rings or aromatic rings. In addition, as the luminescent material, an organic electro-luminescence element material represented by formula III can be used. In the formula III, R -R show hydrogen atoms, halogen atoms, substituted or un-substituted alkyl groups, and alkoxyl groups, respectively and independently.

Organic electroluminescent element material and organic electroluminescent element using it

A light-emitting material which serves to emit light having a high brightness and is almost free of deterioration in light emission, and an organic EL device for which the light-emitting material is adapted, the material having the formula [1],

Satoshi Okutsu

Papers

Light-emitting material for organic electroluminescence device, and organic electroluminescence device for which the light-emitting material is adapted

Organic electroluminescent element material and organic electroluminescent element using the same

Luminescent material for organic electroluminescent element and organic electroluminescent element produced by using the same

Organic electroluminescent element material and organic electroluminescent element using it

Light-emitting material for organo-electroluminescence device and for organic electroluminescence device which the material is applied