An organometallic compound represented by Formula 1, an organic light-emitting device including the organometallic compound, and a diagnostic composition including the organometallic compound:

M(L.sub.1).sub.n1(L.sub.2).sub.n2Formula 1 wherein, in Formula 1, M, L.sub.1, L.sub.2, n1, and n2 are each described herein.

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.

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.

Provided are an organic light-emitting device and an electronic apparatus including the organic light-emitting device. The organic light emitting device includes a first electrode, a second electrode facing the first electrode, and an organic layer disposed between the first electrode and the second electrode. The organic layer includes an emission layer that has a host and a phosphorescent dopant, the host satisfying Equation 1 and Equation 2, and the host and the phosphorescent dopant satisfying Equation 3, where Equation 1: S1(H)T1(H)0.3 eV; Equation 2: T1(H)2.7 eV; and Equation 3: T1(D)T1(H). In Equations 1, 2, and 3, T1(H) indicates a triplet energy of the host, S1(H) indicates a singlet energy of the host, and T1(D) indicates a triplet energy of the phosphorescent dopant.

The invention relates to phenanthrene compounds comprising one or more arylamino groups. Said compounds can be used in electronic devices, in particular OLED's.

An organic light-emitting material, a method for the preparation thereof and use thereof are provided. The organic light-emitting material is a novel organic light-emitting material containing phosphine, has a high electron-transport property and a high fluorescence quantum efficiency, can be used as an emitting layer material and/or an electron transport layer material in an OLED element. Thus, an emitting layer and an electron transport layer in a traditional OLED element can be combined as one layer, thereby simplifying the structure and preparation process of the OLED element. Also, the organic light-emitting material has a specific response to oxygen, metal ions, etc., so that the organic light-emitting material can also be applied in the fields of chemo-biological detection, bio-imaging, anti-counterfeiting, etc. There are advantages of simple synthesis and purification, high yield, and adjustment of its luminous wavelength, luminous efficiency, etc. by introducing different functional groups.

Compounds comprising phosphorescent metal complexes comprising cyclometallated imidazo[1,2-f]phenanthridine and diimidazo[1,2-a:1,2-c]quinazoline ligands, or isoelectronic or benzannulated analogs thereof, are described. Organic light emitting diode devices comprising these compounds are also described.

An organometallic compound represented by Formulae 1, 2, or 3 below: ##STR00001## wherein in Formulae 1, 2, and 3, groups and variables are the same as in the specification.

The present invention relates to organic light emitting elements, comprising thermally activated delayed fluorescence (TADF) emitters and/or hosts of formula

##STR00001##

which have a sufficiently small energy gap between S.sub.1 and T.sub.1 (E.sub.ST) to enable up-conversion of the triplet exciton from T.sub.1 to S.sub.1. The organic light emitting elements show high electroluminescent efficiency.

The present invention includes novel six member aromatic or heteroaromatic rings fused to aza-DBX as ligands for making dopants for OLED applications.