A photoelectric device includes a first photoelectric conversion layer including a heterojunction that includes a first p-type semiconductor and a first n-type semiconductor, a second photoelectric conversion layer on the first photoelectric conversion layer and including a heterojunction that includes a second p-type semiconductor and a second n-type semiconductor. A peak absorption wavelength (λ.sub.max1) of the first photoelectric conversion layer and a peak absorption wavelength (λ.sub.max2) of the second photoelectric conversion layer are included in a common wavelength spectrum of light that is one wavelength spectrum of light of a red wavelength spectrum of light, a green wavelength spectrum of light, a blue wavelength spectrum of light, a near infrared wavelength spectrum of light, or an ultraviolet wavelength spectrum of light, and a light-absorption full width at half maximum (FWHM) of the second photoelectric conversion layer is narrower than an FWHM of the first photoelectric conversion layer.

An organic light-emitting device includes a heterocyclic compound represented by Formula 1 ##STR00001##
In Formula 1, X is O or S, one selected from R.sub.1 to R.sub.8 is a group represented by Formula 2-1, and one selected from the remaining groups is a group represented by Formula 2-2, wherein, when X is O, one selected from R.sub.1, R.sub.2, R.sub.4, R.sub.5, R.sub.7, and R.sub.8 is a group represented by Formula 2-1.

Embodiments of the present invention relate to an organic electronic device capable of ensuring high luminous efficiency, low driving voltage and high heat resistance, and improving color purity or lifespan.

The present specification relates to an ink composition comprising a solvent comprising a solvent represented by Chemical Formula 1, a solvent represented by Chemical Formula 2 and a solvent represented by Chemical Formula 3; and a charge transferring material or a light emitting material, and a method for manufacturing an organic light emitting device formed using the ink composition.

To provide an organic electroluminescent device in which energy efficiency is improved. An organic electroluminescent device includes a pair of electrode layers formed of an anode layer and a cathode layer, and a luminescent layer arranged between the pair of electrode layers, in which the luminescent layer includes a host material and a dopant material, and the dopant material is an anthracene-based compound represented by formula (1), and the luminescent layer further includes a polycyclic aromatic compound represented by formula (2) or a multimer of a polycyclic aromatic compound having a plurality of structures represented by formula (2). ##STR00001##

Compounds that are organic radicals that can have a dual function. The compounds can be fluorescent emitters that emit in the near-IR. The compounds can also facilitate reverse intersystem crossing (RISC) to convert triplet excitons in an OLED to singlet excited states to maximize utilization of generated excitons in the OLED and approach 100% internal quantum efficiency.

An organic electroluminescence device includes: a first emitting layer including a first host material, a first organic material, and a first dopant material; and a second emitting layer including a second host material and a second dopant material, in which the first host material, the first organic material, and the second host material are different compounds in structure and satisfy Numerical Formula 1 and Numerical Formula 2. Numerical Formula 1: T.sub.1(H1)>T.sub.1(H3), Numerical Formula 2: T.sub.1(H2)>T.sub.1(H3) (In Numerical Formula 1 and Numerical Formula 2, T.sub.1(H1), T.sub.1(H2), T.sub.1(H3) are triplet energies of the first host material, the first organic material, and the second host material, respectively.)

The present invention relates to a compound of formula (I) for use in organic electronic devices, a composition comprising a compound of formula (IV) and at least one compound of formula (IVa) to (IVd), an organic semiconductor layer comprising the compound or composition, an organic electronic device comprising the organic semiconductor layer, and a display device comprising the organic electronic device.

##STR00001##

The compound represented by formula (1):

##STR00001##

wherein symbols are as defined in the description, provides an organic electroluminescence device having a device performance further improved.

Provided is an organic light emitting device including a light emitting layer comprising a compound of Chemical Formula 1 and a first organic material layer comprising a compound of Chemical Formula 2:

##STR00001## wherein: Cy1 to Cy5 are each independently one selected from among a substituted or unsubstituted: aromatic hydrocarbon ring, aliphatic hydrocarbon ring, and aromatic hetero ring, or a ring in which two or more rings selected from the above group are fused, one or more of Cy1 to Cy5 are a ring of Chemical Formula 1-A:

##STR00002## one to three of a* to d* are a position fused to or linked to Chemical Formula 1;

##STR00003## L1 to L3 are each independently a direct bond or a substituted or unsubstituted: arylene or divalent heterocyclic group; and Ar1 and Ar2 are each independently a substituted or unsubstituted: aryl or heterocyclic group.