A compound including a first ligand L.sub.A having a structure of Formula I ##STR00001##
is disclosed. The compound is useful a an emitter dopants in OLEDs for enhancing the OLED performance.

A compound of Formula I: ##STR00001## wherein ring A is a 5-membered or 6-membered aromatic ring; wherein R.sup.A, R.sup.B, and R.sup.C each independently represent mono to the maximum allowable substitution, or no substitution; wherein Y.sup.1 is absent or present, and when present is selected from the group consisting of a direct bond, O, S, Se, CRR′, NR, SiRR′, and BR; wherein each X.sup.1-X.sup.3 is N or CR; wherein at least one of X.sup.1-X.sup.3 is N; wherein each A.sup.1-A.sup.5 is independently C or N; wherein the maximum number of N atoms that can connect to each other within each ring is two; wherein each R.sup.1, R.sup.2, R.sup.3, and R.sup.4 is independently selected from the group consisting of alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, aryl, heteroaryl, and combinations thereof; wherein each R, R′, R.sup.A, R.sup.B, and R.sup.C is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and wherein any two substituents may be joined or fused together to form a ring.

A compound of Formula I: ##STR00001##
wherein Y is O, S, or Se;
wherein each X.sup.1-X.sup.14 is independently C or N;
wherein two consecutive X.sup.1-X.sup.14 in the same ring are not N;
wherein any of X.sup.1-X.sup.14 is C when it forms a direct bond to R.sup.A, R.sup.B, R.sup.C, or R.sup.D;
wherein R.sup.A, R.sup.B, R.sup.C, and R.sup.D each independently represent mono to the maximum allowable substitution, or no substitution;
wherein each R.sup.A, R.sup.B, R.sup.C, and R.sup.D is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;
wherein R.sup.D represents mono to the maximum allowable substitution at least one R.sup.D is not hydrogen; and
wherein any two substituents are optionally joined or fused together to form a ring.

Embodiments described herein generally relate to: sensing and/or authentication using luminescence imaging; diagnostic assays, systems, and related methods; temporal thermal sensing and related methods; and/or to emissive species, such as those excitable by white light, and related systems and methods.

Metal-assisted delayed fluorescent emitters employing benzo-imidazo-phenanthridine and analogues for full color displays and lighting applications.

Provided is an organic light-emitting device including: an anode; a cathode provided to face the anode; and organic material layers including a light emitting layer disposed between the anode and the cathode, wherein the light emitting layer, one or more layers of the organic material layers disposed between the anode and the light emitting layer, and one or more layers from among the organic material layers disposed between the cathode and the light emitting layer, each include one or more compounds each composed of sp3 carbon as a center, the light emitting layer includes a host including one or more anthracene-based compounds, and among organic materials included in the organic material layers, the bandgap energy (E.sub.bg) of each of the organic materials except for a dopant compound is 3 eV or more.

Provided is an organic light emitting device including: a first electrode; a second electrode; and an organic material layer having one or more layers provided between the first electrode and the second electrode, in which the organic material layer includes a light emitting layer including a compound of Chemical Formula 1 and a compound of Chemical Formula 2:

##STR00001##

An organic electroluminescence device, comprising a cathode, an anode, and at least one emitting layer disposed between the cathode and the anode, wherein the emitting layer contains a first host material, a second host material, and a dopant material, wherein the first host material is a compound represented by the following formula (1), the second host material is a compound represented by the following formula (2), and one or more selected from the group consisting of the compound represented by the formula (1) and the compound represented by the formula (2) have at least one deuterium atom.

##STR00001##

Provided are an organic electroluminescent material and a device thereof. The organic electroluminescent material is a metal complex including a ligand L.sub.a having a structure of Formula 1, and the metal complex can be used as luminescent materials in electroluminescent devices. These new compounds, when used in electroluminescent devices, can show better performance, provide lower device voltage and higher device efficiency, and significantly improve the comprehensive performance of devices. Further provided are an electroluminescent device including the metal complex and a compound composition including the metal complex.

Provided are a condensed cyclic compound, a light-emitting device including the same, and an electronic apparatus including the light-emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electrode, an interlayer disposed between the first electrode and the second electrode and including an emission layer, and at least one condensed cyclic compound, which is represented by Formula 1, which is defined in the specification:

##STR00001##