A quantum dot includes a core, a first shell and a second shell. The core includes a group III-V compound. The first shell includes a second semiconductor nanocrystal. The second semiconductor nanocrystal includes zinc, selenium and a dopant including tellurium. The second shell includes a third semiconductor nanocrystal. The third semiconductor nanocrystal includes a II-VI compound.

A quantum dot includes a core, a first shell and a second shell. The core includes a group III-V compound. The first shell includes a second semiconductor nanocrystal. The second semiconductor nanocrystal includes zinc, selenium and a dopant including tellurium. The second shell includes a third semiconductor nanocrystal. The third semiconductor nanocrystal includes a II-VI compound.

A color filter including a first pixel (or color conversion region) that is configured to emit a first light and a display device including the color filter. The first pixel includes a (first) quantum dot composite (or a color conversion layer including the quantum dot composite), wherein the quantum dot composite may include a matrix and a plurality of quantum dots dispersed (e.g., randomly) in the matrix, wherein the plurality of the quantum dots exhibit a multi-modal distribution (e.g., a bimodal distribution) including a first peak particle size and a second peak particle size in a size analysis, wherein the second peak particle size is greater than the first peak particle size, and a difference between the first peak particle size and the second peak particle size is less than or equal to about 5 nanometers (nm) (e.g., less than or equal to about 4.5 nm).

A color filter including a first pixel (or color conversion region) that is configured to emit a first light and a display device including the color filter. The first pixel includes a (first) quantum dot composite (or a color conversion layer including the quantum dot composite), wherein the quantum dot composite may include a matrix and a plurality of quantum dots dispersed (e.g., randomly) in the matrix, wherein the plurality of the quantum dots exhibit a multi-modal distribution (e.g., a bimodal distribution) including a first peak particle size and a second peak particle size in a size analysis, wherein the second peak particle size is greater than the first peak particle size, and a difference between the first peak particle size and the second peak particle size is less than or equal to about 5 nanometers (nm) (e.g., less than or equal to about 4.5 nm).

A color filter including a first layer including first quantum dots and a second layer including second quantum dots that are different from the first quantum dots, and disposed on the first layer, wherein a quantum yield of the first quantum dots is greater than a quantum yield of the second quantum dots, and wherein an absorption of blue light of the second quantum dots is greater than an absorption of the blue light of the first quantum dots.

A color filter including a first layer including first quantum dots and a second layer including second quantum dots that are different from the first quantum dots, and disposed on the first layer, wherein a quantum yield of the first quantum dots is greater than a quantum yield of the second quantum dots, and wherein an absorption of blue light of the second quantum dots is greater than an absorption of the blue light of the first quantum dots.

The present invention discloses a process for the preparation of metal sulphide quantum dots by using a very low cost sulphur precursor as a sulphur source. The metal sulphide quantum dots finds application in optical devices selected from photovoltaic cells, photodetectors and light-emission devices.

The present invention discloses a process for the preparation of metal sulphide quantum dots by using a very low cost sulphur precursor as a sulphur source. The metal sulphide quantum dots finds application in optical devices selected from photovoltaic cells, photodetectors and light-emission devices.

Disclosed are beta-type active zinc sulfide and a preparation method therefor. The method includes: adding an oil phase containing styrene monomers into a water phase containing a pore-forming agent, a surfactant, a Zn salt, a complexing agent, a sulfur source and a water-soluble initiator, conducting mixing and emulsification, introducing metal elements, dissolving polystyrene of microspheres prepared through reaction in tetrahydrofuran, and then conducting calcination, pickling and activation to obtain the beta-type active zinc sulfide. The zinc sulfide microspheres prepared by the present invention are beta-type, and have excellent photoelectric properties and broad application prospects.

Disclosed are beta-type active zinc sulfide and a preparation method therefor. The method includes: adding an oil phase containing styrene monomers into a water phase containing a pore-forming agent, a surfactant, a Zn salt, a complexing agent, a sulfur source and a water-soluble initiator, conducting mixing and emulsification, introducing metal elements, dissolving polystyrene of microspheres prepared through reaction in tetrahydrofuran, and then conducting calcination, pickling and activation to obtain the beta-type active zinc sulfide. The zinc sulfide microspheres prepared by the present invention are beta-type, and have excellent photoelectric properties and broad application prospects.