A semiconductor nanoparticle complex in which two or more ligands including an aliphatic ligand and a polar ligand are coordinated to a surface of a semiconductor nanoparticle, wherein: the ligands are composed of an organic group and a coordinating group; in the aliphatic ligand, the organic group is an aliphatic hydrocarbon group; the polar ligand includes a hydrophilic functional group in the organic group; a mass ratio of the aliphatic ligand to the polar ligand (aliphatic ligand/polar ligand) is 0.05 to 1.00; a ratio ({(X.sub.H)/L}×100) of a mass reduction rate of the semiconductor nanoparticle complex in a range of 350° C. or higher and 550° C. or lower in a thermogravimetric analysis (X.sub.H) to a mass fraction of all ligands in the semiconductor nanoparticle complex at room temperature (L) is 10 or more and 55 or less.

An object of the present invention is to provide a novel electrochromic device (ECD). Disclosed is an electrochromic device (ECD) comprising two metal-complex-based electrochromic thin films individually acting as a working electrode and a counter electrode; (i) one of the two metal-complex-based electrochromic thin films being a film of a cathodically coloring metallo-supramolecular polymer comprising at least one organic ligand having a plurality of metal coordination positions and a metal ion of at least one transition metal and/or lanthanoid metal with the at least one organic ligand and the metal ion being arranged alternately, and the other of the two metal-complex-based electrochromic thin films being a film of an anodically coloring metal hexacyanoferrate (MHCF) represented by the formula: M(II).sub.3[Fe(III)CN.sub.6].sub.2 (where M=Fe, Ni or Zn), and (ii) the electrochromic device having a first conducting substrate; the film of the cathodically coloring metallo-supramolecular polymer; an electrolyte; the film of the anodically coloring metal hexacyanoferrate (MHCF); and a second conducting substrate being arranged in this order.

Described herein are two-coordinated d10 metal carbene complexes containing (i) Cu(I), Ag(I), or Au(I), (ii) a pyrazine-fused NHC ligand or a pyridine-fused NHC ligand, and (iii) a carbazole ligand, a pyrido[2,3-b]indole ligand, or a pyrido[3,4-b]indole ligand. The radiative properties of the compounds can be controlled by thermally activated delayed fluorescence. The emission colors of the complexes can be tuned by using carbazoles with varying donor strength. Also described are methods of using the complexes.

The present invention provides quantum dot (QD)-in-matrix materials for use in blue light emitting diodes, wherein the QD-in-matrix material comprises a plurality of quantum dots embedded in a doped lead perovskite matrix.

A series of thermally stable and highly luminescent cyclometalated tetradentate ligand-containing gold(III) compounds was designed and synthesized. The cyclometalated tetradentate ligand-containing gold(III) compounds can be used as light-emitting material for fabrication of light-emitting devices. The cyclometalated tetradentate ligand-containing gold(III) compounds can be deposited as a layer or a component of a layer using a solution-processing technique or a vacuum deposition process. The cyclometalated tetradentate ligand-containing gold(III) compounds are robust and can provide electroluminescence with high efficiency and brightness. More importantly, the vacuum-deposited OLEDs demonstrate long operational stabilities with half-lifetime of over 29,700 hours at 100 cd m.sup.−2.

Methods of making metal halide perovskites, including methods of making micro crystals of metal halide perovskites. The metal halide perovskites, including the micro crystals, may have a 0D structure. The metal halide perovskites may be a light emitting material.

Bulk assemblies are provided, which may have desirable photoluminescence quantum efficiencies. The bulk assemblies may include two or more metal halides, and a wide band gap organic network. The wide band gap organic network may include organic cations. The metal halides may be disposed in the wide band gap organic network. Light emitting composite materials also are provided.

A zinc oxide (ZnO) nanomaterial includes a ZnO nanoparticle and a surface ligand. The surface ligand bonded to the ZnO nanoparticle has a structure of

##STR00001##

R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 are independently selected from at least one of hydrogen, alkoxy group with a carbon number of one to three, or amino group. R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 include one to three alkoxy groups with a carbon number of one to three and zero to one amino group.

An optoelectronic component is specified comprising: at least one radiation-emitting semiconductor chip (1) which during operation emits electromagnetic radiation of a first wavelength range, and an absorber, wherein the absorber is predominantly transmissive to the emitted electromagnetic radiation of the first wavelength range, and the absorber absorbs at least 70% of the total radiation intensity of the electromagnetic spectrum of the visible light of the ambient light.

The disclosure relates to the technical field of display, in particular to a luminescent film, a preparation method thereof, and an electroluminescent device. The luminescent film comprises: a crystallized blue-light perovskite material, and halogenated amine ligand materials grafted on the crystallized blue-light perovskite material, wherein the crystallized blue-light perovskite material comprises 3D perovskite nano-crystals; and the halogenated amine ligand materials comprise a first halogenated amine ligand material and a second halogenated amine ligand material, and the first halogenated amine ligand material is different from the second halogenated amine ligand material. The disclosure is suitable for manufacturing luminescent films and electroluminescent devices.