A chelate and associated security feature including a lanthanide metal and a ligand of formula (1), formula (2), or formula (3), ##STR00001##
where each of R.sub.1-R.sub.7 in formula (1) is independently selected from the group consisting of H, OH, NH.sub.2, Cl, F, OMe, OAr, OCF.sub.3, CF.sub.3, alkyl, aryl, phenyl, OPh, and heteroaromatic, where each of R.sub.1-R.sub.5 in formula (2) is independently selected from the group consisting of H, OH, NH.sub.2, Cl, F, OMe, OAr, OCF.sub.3, CF.sub.3, NMe.sub.2, CN, alkyl, aryl, phenyl, OPh, and heteroaromatic, and where R.sub.6 in formula (2) is selected from the group consisting of H, NH.sub.2, Cl, F, OMe, OAr, OCF.sub.3, CF.sub.3, NMe.sub.2, CN, alkyl, aryl, phenyl, OPh, and heteroaromatic, and where each of R.sub.1-R.sub.5 in formula (3) is independently selected from the group consisting of H, OH, NH.sub.2, Cl, F, OMe, OAr, OCF.sub.3, CF.sub.3, alkyl, aryl, phenyl, OPh, and heteroaromatic.

The disclosure pertains to an organic molecule for use in optoelectronic devices. The organic molecule has a structure of Formula I:

##STR00001## wherein X is selected from the group consisting of a direct bond, NR.sup.1, O, S, SiR.sup.1R.sup.2 and CR.sup.1R.sup.2; Y is selected from the group consisting of a direct bond, NR.sup.3, O, S, SiR.sup.3R.sup.4 and CR.sup.3R.sup.4; and R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are each independently selected from the group consisting of: hydrogen, deuterium, N(R.sup.5).sub.2, OR.sup.5, SR.sup.5, Si(R.sup.5).sub.3, B(OR.sup.5).sub.2, OSO.sub.2R.sup.5, CF.sub.3, CN, halogen, C.sub.1-C.sub.40-alkyl, C.sub.1-C.sub.40-alkoxy, C.sub.1-C.sub.40-thioalkoxy, C.sub.2-C.sub.40-alkenyl, C.sub.2-C.sub.40-alkynyl, C.sub.6-C.sub.60-aryl, and C.sub.3-C.sub.57-heteroaryl.

An organic light-emitting device including a first compound represented by Formula 1 and a second compound represented by one of Formulae 2A and 2B. ##STR00001##

Provided is a blue light emitting organic EL device having high emission efficiency and a long lifetime. This organic EL device includes one or more light emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light emitting layers includes a first host selected from indolocarbazole compounds, a second host selected from the compounds represented by the following general formula (2), and, as a light emitting dopant, a polycyclic aromatic compound represented by the following general formula (3) or a polycyclic aromatic compound represented by the general formula (3) as a substructure, wherein Y.sup.4 is B, P, P═O, P═S, Al, Ga, As, Si—R.sup.4 or Ge—R.sup.5, and X.sup.4 is O, N—Ar.sup.4, S or Se.

##STR00001##

Provided are organometallic compounds comprising a first ligand L.sub.A which is based on a structure of fused five and six-membered rings according to Formula I as described herein and their various uses including as emitters in devices. Also provided are formulations comprising these compounds. Further provided are organic light emitting devices (OLEDs) and related consumer products that utilize these compounds.

A compound of a first ligand L.sub.A of Formula I,

##STR00001##

is provided. In Formula I, moieties A and B are each a monocyclic ring or a polycyclic fused-ring system; Z.sup.1 to Z.sup.4 are each C or N; K is a direct bond, O, or S; each R.sup.A and R.sup.B is independently a hydrogen or a General Substituent; at least one R.sup.A or R.sup.B is R*, wherein R* has a structure of Formula II, ---L-GeR.sup.1R.sup.2R.sup.3; L is a direct bond or an organic linker; and L.sub.A is coordinated to a metal M by the dashed lines; and metal M is selected from Ir, Rh, Re, Ru, Os, Pt, Pd, Ag, Au, or Cu.

Platinum, palladium, and gold complexes suitable for use as phosphorescent emitters or as delayed fluorescent and phosphorescent emitters having the structure of Formula VIII. ##STR00001##

An organometallic compound represented by Formula 1:

##STR00001##

wherein Y.sub.1 to Y.sub.4 are each independently C or N, one of Y.sub.1 to Y.sub.4 is N bonded to iridium in Formula 1, and another of Y.sub.1 to Y.sub.4 is C bonded to ring CY.sub.2 in Formula 1, Y.sub.9 is O, S, N(R.sub.19), C(R.sub.19a)(R.sub.19b), or Si(R.sub.19a)(R.sub.19b), X.sub.2 is C, ring CY.sub.1 and ring CY.sub.2 are each independently a C.sub.5-C.sub.30 carbocyclic group or a C.sub.1-C.sub.30 heterocyclic group, a1 and a2 are each independently an integer from 0 to 20, and R.sub.1, R.sub.19, R.sub.19a, R.sub.19b, R.sub.2, R.sub.30a, R.sub.30b, and R.sub.37 are each as described herein.

A composition containing a phosphorescent compound represented by the formula (1) and a compound (F) having a condensed hetero ring skeleton containing at least one atom (a) selected from the group consisting of a nitrogen atom and a boron atom in the ring is provided. If the value of the energy level in the lowest triplet excited state of the above-described phosphorescent compound is expressed as T.sub.p (eV), the value of the energy level of the lowest triplet excited state of the above-described compound (F) is expressed as T.sub.F (eV) and the number of the above-described atom (a) in the condensed hetero ring skeleton per 1000 of the molecular weight of the above-described compound (F) is expressed as N.sub.f, then, the formula (A) and the formula (B) are satisfied:

|T.sub.P|−|T.sub.F|≥0.15  (A)

0.01≤N.sub.f≤4.5  (B)

##STR00001##

The invention relates to compounds comprising functional substituents in a specific spatial arrangement, devices containing same, and the preparation and use thereof.