A composition that includes a fluorescent metal-organic framework (MOF) and a drilling fluid is provided. The MOF includes a porous, crystalline structure and a fluorescent source. A method includes introducing a MOF into a drilling fluid and circulating the drilling fluid through a well during a drilling operation that creates formation cuttings such that the fluorescent MOF interacts with the formation cuttings, creating tagged cuttings. The method further includes collecting returned cuttings from the circulating drilling fluid at a surface of the well, detecting the presence of the fluorescent MOF on the returned cuttings to identify the tagged cuttings, and correlating the tagged cuttings with a drill depth in the well at a time during the drilling operation.

Provided are organometallic compounds comprising a central metal atom to which a ligand is coordinated comprising at least two 5-membered to 10-membered carbocyclic or heterocyclic rings which are linked to together by a linking group. Also provided are formulations comprising these organometallic compounds. Further provided are organic light emitting devices (OLEDs) as well as related consumer products that utilize these organometallic compounds.

Provided are organometallic compounds comprising a 6-membered aromatic ring to which a 5-membered ring is fused and which is further linked via a direct bond to another 5-membered ring. 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.

Aspects of the disclosure relates to articles, compositions, and systems for targeted cargo delivery and release. In some embodiments, the disclosure relates to metal organic frameworks (MOF). The MOFs comprise a plurality of metal clusters and a plurality of ligands that are coordinated with the plurality of metal clusters. In some embodiments, the disclosure relates to the MOFs possessing azobenzene moiety sensitive to hypoxic conditions. In some embodiments, the disclosure relates to one-dimensional coordination polymers being utilized for drug delivery for cancer treatment. While in some embodiments, the disclosure relates to the persistent luminescent phosphors and their photoluminescence behaviour in the presence of oxygen. Lastly, in some embodiments, the disclosure relates to how MOFs have been employed in OLED technology because of their tunable nature, large surface area and their versatile chemistry. Thus, MOFs play an important role in photovoltaic technology and expanding the market for sustainable energy solutions.

The subject application relates to organic electroluminescent materials and devices. A compound is provided that has a structure including Formula I,

##STR00001##

In Formula I, ring A is a 5-membered or 6-membered ring; each of moiety B and C is a monocyclic ring or a polycyclic fused ring system; metal M is Pt or Pd; each of Z.sup.1, Z.sup.2, and X.sup.1 to X.sup.14 is C or N; each of K.sup.1, K.sup.2, and K.sup.3 is a direct bond or a linker; each of L.sup.1, L.sup.2, and L.sup.3 is a direct bond or a linker; each R substituent is hydrogen or a General Substituent defined herein; each of R.sup.1 and R.sup.F is a General Substituent defined herein; and any two substituents can be joined or fused to form a ring. Formulations, OLEDs, and consumer products containing the compound are also provided.

A composition that includes a fluorescent metal-organic framework (MOF) and a drilling fluid is provided. The MOF includes a porous, crystalline structure and a fluorescent source. A method includes introducing a MOF into a drilling fluid and circulating the drilling fluid through a well during a drilling operation that creates formation cuttings such that the fluorescent MOF interacts with the formation cuttings, creating tagged cuttings. The method further includes collecting returned cuttings from the circulating drilling fluid at a surface of the well, detecting the presence of the fluorescent MOF on the returned cuttings to identify the tagged cuttings, and correlating the tagged cuttings with a drill depth in the well at a time during the drilling operation.

Provided are a perovskite optoelectronic device containing an exciton buffer layer, and a method for manufacturing the same. The optoelectronic device of the present inventive concept comprises: an exciton buffer layer in which a first electrode, a conductive layer disposed on the first electrode and comprising a conductive material, and a surface buffer layer containing fluorine-based material having lower surface energy than the conductive material are sequentially deposited; a photoactive layer disposed on the exciton buffer layer and containing a perovskite photoactive layer; and a second electrode disposed on the photoactive layer. Accordingly, a perovskite is formed with a combined FCC and BSS crystal structure in a nanoparticle photoactive layer. The present inventive concept can also form a lamellar or layered structure in which an organic plane and an inorganic plane are alternatively deposited; and an exciton can be bound by the inorganic plane, thereby being capable of expressing high color purity.

Complexes and devices, such as organic light emitting devices and full color displays, including a compound of the formula: ##STR00001## wherein: M is Pd.sup.2+, Ir.sup.+, Rh.sup.+, or Au.sup.3+; each of V.sup.1, V.sup.2, V.sup.3, and V.sup.4 is coordinated to M and is independently N, C, P, B, or Si; each of L.sup.1, L.sup.2, L.sup.3, and L.sup.4 is independently a substituted or unsubstituted aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, carbene, or N-heterocyclic carbene; and Z is O, S, NR, CR.sub.2, SiR.sub.2, BR, PR, ##STR00002## where each R is independently substituted or unsubstituted C.sub.1-C.sub.4 alkyl or substituted or unsubstituted aryl.

Disclosed are nanostructures comprising Ag, In, Ga, and S and a shell comprising Ag, Ga and S, wherein the nanostructures have a peak wavelength emission of 480-545 nm and wherein at least about 80% of the emission is band-edge emission. Also disclosed are methods of making the nanostructures.