The disclosure relates to the technical field of functional nanomaterials, in particular to a fluorescent metal-organic framework superstructure compound, a preparation method and application thereof. The present disclosure provides a method for preparing a fluorescent metal-organic framework superstructure compound, comprising the steps of: providing a microfluidic mixing device; injecting a soluble rare earth salt solution from the first feeding pipe 1; injecting an oil phase solution from the second feeding pipe 2; forming droplets of the rare earth salt solution in the mixing channel 4; then subjecting the droplets to a coordination reaction with an organic ligand solution to obtain the fluorescent metal-organic framework superstructure compound. The preparation method provided by the present disclosure can prepare the fluorescent metal-organic framework superstructure compound in the form of a sphere which is self-assembled from MOFs nanorods, and the particle size distribution of the sphere is uniform.

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.

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.

Compositions and methods for determining the origin location of a subterranean rock sample. Compositions include a nanoparticle tag with a fluorescent core and a polymer shell. The fluorescent core can include up-converting nanoparticles, rare earth element doped oxide, long persistent fluorescent materials, or encapsulated lanthanide complexes. Methods include mixing a nanoparticle tag into a fluid, flowing the fluid through a work string into a subterranean formation, recovering subterranean rock samples from the subterranean formation, and determining an origin location of the subterranean rock sample by detecting the presence of the nanoparticle tag on the sample.

An organic light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode, the organic layer including an emission layer. The organic layer includes a first compound represented by Formula 1 and a second compound represented by Formula 2. The first compound may be included in an emission layer, and the second compound may be included in an electron transport region.

##STR00001##

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.

The present invention relates to a composition of a superfluorescent cerium (III)-containing chelate having ultra-short decay time, especially a molecular composition for OLED applications, having a neutral donor in the form of a Ce(III) chelate and a neutral fluorescent receptor molecule. The composition of the present invention can be used to produce pure color luminescence with very short emission decay time, especially for a dark blue luminous region. The composition utilizes an excited state dual capture mechanism, and such kind of novel exciton capture mechanism can be classified into a fifth-generation organic light-emitting diode (OLED) and other photoelectric devices.

The present technology discloses smart labels to monitor physical parameters, and for traceability and authentication of objects, documents or people. This active and multifunctional label is based on spectrally and spatially multiplexed Quick Response (QR) codes (A). Spectrally selectivity is achieved using luminescent materials and spatially multiplexing is achieved using different patterns (B) combining both to design improved QR codes able to store information at different layers of accessibility. This brings advantages over the actual scenario of QR codes wherein the amount of storage information increases up to three times, adding the capability to sense physical parameters and allow to control the provided information, creating public and restricted access. To access and read the content of each layer, different illumination is used (C) to (E) and is processed using a device or via dedicated applications.

A metal-organic coordination compound, wherein the coordination compound comprises at least one divalent lanthanide coordinated by a cyclic organic ligand according to formula 1:

##STR00001## wherein i is larger than 3; and n is equal to 1, 2, or 3; and L for each occurrence is independently selected from divalent cyclic organic groups that can be substituted and that are formed by removing two hydrogen atoms from an organic cyclic molecule that can be substituted, arylenes, preferably 5- or 6-membered ring aromatic or heteroaromatic group, or biradical fragments of

##STR00002##

and X is independently selected for each occurrence from the group of:

##STR00003## wherein R.sub.1 and R.sub.2 are hydrogen or any covalently bound substituents being identical or different in each occurrence; and wherein R.sub.1 and/or R.sub.2 are at least in 3 occurrences not hydrogen, and wherein two groups R.sub.2 can be covalently linked with each other, thereby forming a further cyclic element, it also being possible that two cyclic organic ligands of formula 1 are covalently linked with each other by one or two divalent linking groups which divalent linking groups are formed of one R.sub.1 of each of the two cyclic organic ligands of formula 1 that are covalently linked with each other.

The disclosure features methods of analyzing a fluid extracted from a reservoir, the methods including introducing a first composition featuring a first complexing agent into a reservoir at a first location, extracting a fluid from the reservoir at a second location different from the first location, combining the fluid with a second composition featuring a concentration of a lanthanide ion to form a third composition featuring a concentration of a complex formed by the first complexing agent and the lanthanide ion, exposing a quantity of the complex to electromagnetic radiation for a first time period ending at a time t.sub.0, detecting fluorescence emission from the quantity of the complex for a second time period starting at a time t.sub.1>t.sub.0, where t.sub.1−t.sub.0 is greater than 2 microseconds, and determining information about a fluid flow path between the first location and the second location.