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 is a bipolar compound having a p-type moiety and an n-type moiety and has high energy level and proper energy bandgap for an emissive layer of the OLED. As the organic compound is applied into the emissive layer, the OLED can maximize its luminous properties as holes and electrons are recombined uniformly over the whole area in an EML. ##STR00001##

A nanoparticle conjugate includes a quantum dot (QD) and a thermally activated delayed fluorescence (TADF) molecule bound to the QD. In some instances, the TADF molecule can be directly bound to a surface of the QD. In other instances, the TADF molecule can be indirectly bound to the QD via an interaction with one or more capping ligands disposed on a surface of the QD. Nanoparticle conjugates described herein can be incorporated into emissive layers of electroluminescent light-emitting diode devices to yield electroluminescent quantum dot-containing light-emitting diode (QD-LED) devices.

A light-emitting element with high emission efficiency and high reliability is provided. The light-emitting element includes a host material and a guest material in a light-emitting layer. The host material has a function of converting triplet excitation energy into light emission and the guest material emits fluorescence. The molecular structure of the guest material is a structure including a luminophore and protecting groups, and five or more protecting groups are included in one molecule of the guest material. The introduction of the protecting groups into the molecule inhibits energy transfer of triplet excitation energy by the Dexter mechanism from the host material to the guest material. As the protecting group, an alkyl group or a branched-chain alkyl group is used.

The disclosure relates to an organic light emitting diode, a method for manufacturing the same, and a display panel. The organic light emitting diode includes: a first electrode; a second electrode disposed opposite to the first electrode; a light-emitting layer between the first electrode and the second electrode; the light-emitting layer includes a first light-emitting sub-layer and a second light-emitting sub-layer; the first light-emitting sub-layer includes a host material, a TADF sensitizer and a fluorescent guest material; the second light-emitting sub-layer includes the host material or includes the host material and the TADF sensitizer. The light-emitting layer of the organic light emitting diode of the present disclosure includes the first light-emitting sub-laver and the second light-emitting sub-layer, and thus the luminous efficiency of the red light-emitting device, the green light-emitting device, and the blue light-emitting device can be harmonized by effectively adjusting a thickness of the second light-emitting sub-layer.

A thermally activated delayed fluorescent material, preparing method thereof, and an organic electroluminescent device are disclosed. The organic electroluminescent device includes an anode layer, a cathode layer, and a light-emitting layer disposed between the anode layer and the cathode layer. The light-emitting layer includes a thermally activated delayed fluorescent material. A structural formula of the thermally activated delayed fluorescent material is shown in the following structural formula I: ##STR00001##
and R.sub.1-R.sub.6 are electron donor units.

A compound is represented by a formula (1). n is 2 to 4, m is 1 to 4, q is 0 to 3, and m+n+q=6; CN is a cyano group; D.sub.1 is a group represented by a formula (2), (3) or (3X), the plurality of D.sub.1 are the same; and Rx is a hydrogen atom or substituent. R.sub.1 to R.sub.8 are each independently a hydrogen atom or substituent. R.sub.31 to R.sub.38 and R.sub.41 to R.sub.48 are each independently a hydrogen atom or substituent; p, px and py are each independently 1 to 4; A to C are each independently a cyclic structure represented by a formula (131) or (132). R.sub.19 and R.sub.20 are each independently a hydrogen atom or substituent. X.sub.1 is a sulfur atom or the like, and * represents a bonding position with a carbon atom of a benzene ring in the formula (1). ##STR00001##

A compound of Formula I,

##STR00001##

is provided. In Formula I, moiety A is a monocyclic ring or a polycyclic fused ring system; each of X.sup.1 to X.sup.2 and Z.sup.1 to Z.sup.3 is independently C or N; Y.sup.1 is C, N, O, S, Se, P, or As; K is a direct bond or a linker; each of A.sup.1 and A.sup.2 is C, Si, N, P, or As; each of L.sup.1, L.sup.2, and L.sup.3 is absent, a direct bond, or a linker; at least one of L.sup.1 to L.sup.4 is present; when L.sup.3 is present, X.sup.11 is C, whereas if L.sup.3 is absent, X.sup.11 is C or N; M is Pt or Pd; each R.sup.1, R.sup.2, R.sup.A, R.sup.B, R.sup.C, R.sup.D, R.sup., and R.sup. is hydrogen or a General Substituent defined herein and R* is a General Substituent defined herein. Formulations, OLEDs, and consumer products containing the compound are also provided.

A composition including an organometallic compound represented by Formula 1, a light-emitting device including the organometallic compound represented by Formula 1, and electronic equipment including the light-emitting device are provided. In addition, the organometallic compound represented by Formula 1 is also provided:

##STR00001##

Provided are organometallic compounds comprising an Ir atom as the central metal atom which is coordinated by at least two ligands which are different from each other. Also provided are formulations comprising these organometallic compounds. Further provided are organic light emitting devices (OLEDs) and related consumer products that utilize these organometallic compounds.

A compound having a structure of Formula I, ##STR00001##
is provided. In Formula I, Z.sup.1 to Z.sup.16 are each CR or N; three consecutive ones of Z.sup.1 to Z.sup.16 within the same ring cannot be N; each R is independently a hydrogen or a substituent selected from a variety of substituents; at least one R includes and electron donor substituent; at least one R includes an electron acceptor substituent; and any two Rs on the same ring can be joined or fused together to form a ring. Organic light emitting devices, consumer products, formulations, and chemical structures containing the compounds are also disclosed.