A semiconductor nanocrystal particle including a transition metal chalcogenide represented by Chemical Formula 1, the semiconductor nanocrystal particle having a size of less than or equal to about 100 nanometers, and a method of producing the same:
M.sup.1M.sup.2Cha.sub.3  Chemical Formula 1 wherein M.sup.1 is Ca, Sr, Ba, or a combination thereof, M.sup.2 is Ti, Zr, Hf, or a combination thereof, and Cha is S, Se, Te, or a combination thereof.

The present invention relates to a method for controlling a condition of a plant.

Emissive layers for electroluminescent display devices are described herein. The emissive layer can include a two-dopant system having a population of quantum dots (QDs) and a population of molecules exhibiting thermally activated delayed fluorescence (TADF). In some instances, one or both of the QDs and TADF molecules can be disposed in a host matrix. In some instances, the QDs and TADF molecules can be disposed in separate host matrices. In some instances, an electroluminescent display device can include an emissive layer comprising a population of quantum dots (QDs) and a layer adjacent to the emissive layer, the adjacent layer comprising a population of molecules exhibiting thermally activated delayed fluorescence (TADF).

A color conversion particle includes a core; and a shell that contains the core and absorbs excitation light, and emits light at the core or at an interface between the core and the shell upon receiving the irradiated excitation light. The core is composed of a chalcogenide perovskite, and the core and the shell have band alignment that induces a Stokes shift.

The present invention relates to a phosphor and a composition.

A semiconductor nanocrystal particle including a transition metal chalcogenide represented by Chemical Formula 1, the semiconductor nanocrystal particle having a size of less than or equal to about 100 nanometers, and a method of producing the same:

M.sup.1M.sup.2Cha.sub.3 Chemical Formula 1 wherein M.sup.1 is Ca, Sr, Ba, or a combination thereof, M.sup.2 is Ti, Zr, Hf, or a combination thereof, and Cha is S, Se, Te, or a combination thereof.

A chalcogenide perovskite, having a crystallite size T1 of less than 40 nm, calculated by Scherrer equation based on the diffraction peak having the largest peak height in the X-ray diffraction spectrum obtained by X-ray diffraction measurement, and a proportion of a total area occupied by particles having a particle diameter of 10 m or more measured by microscopy to a total area occupied by particles existing in a captured image range in an image range captured by a microscope of 10% or less.

Disclosed herein are methods to synthesize perovskite nanoparticles in solution and at a relatively low temperature (110-300 C). This synthesis of low-temperature, solution-based chalcogenide perovskites were shown to produce materials with excellent optoelectronic properties. Furthermore, disclosed is a technique to stabilize the desired phase of these perovskites (particularly those phases which can not be fabricated in existing techniques). In addition, the material of the composition BaZrS3 (barium zirconium sulfide) has been synthesized in the perovskite crystal structure as nanoparticles for the first time.

A quantum dot microcapsule according to an embodiment of the present invention includes one or more quantum dots each including a ligand coupled to an outer circumferential surface thereof, the ligand being made of an organic material, and a microcapsule accommodating the one or more quantum dots. The microcapsule includes an oil or a solvent with the quantum dots dispersed therein. There are effects capable of not only effectively adjusting a density of quantum dots through formation of a microcapsule formed to include one or more quantum dots and filled with an oil, but also effectively protecting ligands of the quantum dots from an environment such as oxygen, moisture or the like, against which the ligands are weak.

A color conversion particle includes a core; and a shell that contains the core and absorbs excitation light, and emits light at the core or at an interface between the core and the shell upon receiving the irradiated excitation light. The core is composed of a chalcogenide perovskite, and the core and the shell have band alignment that induces a Stokes shift.