An organic compound is represented by general formula (1) below:

##STR00001## where X.sub.1 and X.sub.2 are each independently selected from the group consisting of an alkyl group, an aryl group, and an aralkyl group; R.sub.11 to R.sub.16 are each independently selected from the group consisting of a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, a heterocyclic group, and a halogen atom; R.sub.21 and R.sub.22 are each independently selected from the group consisting of a hydrogen atom, an alkyl group, an aryl group, and an aralkyl group; and A.sub.1.sup. and A.sub.2.sup. each independently represent a monovalent anion.

The present disclosure relates to an organic compound having the following structure, and an organic light emitting diode (OLED) and an organic light emitting device including the organic compound. The organic compound includes an electron donor moiety separated from an electron acceptor moiety, thus has delayed fluorescent properties. Applying the organic compound into an emissive layer makes the OLED and the organic light emitting device can allows the OLED and the organic light emitting device to improve their luminous efficiency. ##STR00001##

An organic electroluminescence device of one or more embodiments includes a first electrode, a hole transport region disposed on the first electrode, an emission layer disposed on the hole transport region, an electron transport region disposed on the emission layer and a second electrode disposed on the electron transport region, wherein the emission layer includes a polycyclic compound represented by Formula 1, thereby showing high emission efficiency: ##STR00001##
wherein Y is O or S.

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.

Platinum, palladium, and gold complexes suitable for use as phosphorescent emitters or as delayed fluorescent and phosphorescent emitters having one of the following structures:

##STR00001## ##STR00002##

Described herein are devices, compositions, and methods for improving color discernment.

The present invention relates to an electro-fluorescence device which includes an electro-active infrared fluorescence compound or a mixture including these compounds, and an electrolyte, such that an infrared light emitting signal is controlled by selecting and supplying a power source, which may induce electrical oxidation and reduction, so as to switch the infrared fluorescence. The low-voltage driven infrared signal modulating device of the present invention may be driven at 3 V or less, and thus may be applied for the use of an infrared biosensor, an infrared security signal generator, and an infrared signal disturbance.

An organometallic compound represented by Formula 1:

M(L.sub.11).sub.n1(L.sub.12).sub.n2Formula 1 wherein, in Formula 1, M is a third row transition metal, L.sub.11 is a ligand represented by Formula 2, n1 is 1 or 2, and when n1 is two, two groups L.sub.11 are identical to or different from each other, L.sub.12 is an organic ligand, n2 is 0, 1, 2, or 3, and when n2 is two or more, two or more of groups L.sub.12 are identical to or different from each other:

##STR00001## wherein, in Formula 2, groups and variables are the same as described in the specification.

An organometallic compound represented by Formula 1:

M.sub.1(L.sub.1).sub.n1(L.sub.2).sub.n2 Formula 1 wherein, in Formula 1, M.sub.1 is a transition metal, L.sub.1 is a ligand represented by Formula 1A, L.sub.2 is a ligand represented by Formula 1B, and n1 and n2 are each independently 1 or 2,

##STR00001## wherein X.sub.1 is C or N, X.sub.2 is C or N, X.sub.11 is C(R.sub.11) or N, X.sub.12 is C(R.sub.12) or N, X.sub.13 is C(R.sub.13) or N, X.sub.14 is C(R.sub.14) or N, X.sub.15 is C(R.sub.15) or N, X.sub.16 is C(R.sub.16) or N, and X.sub.17 is C(R.sub.17) or N, provided that at least one of X.sub.14 to X.sub.17 is not N; and at least one of R.sub.14 to R.sub.17 comprises Si(Q.sub.1)(Q.sub.2)(Q.sub.3) or Ge(Q.sub.1)(Q.sub.2)(Q.sub.3); and the remaining substituent groups of Formulae 1A and 1B are as provided herein.

Platinum, palladium, and gold complexes suitable for use as phosphorescent emitters or as delayed fluorescent and phosphorescent emitters having one of the following structures: ##STR00001## ##STR00002## ##STR00003##