Perovskite-containing composite material and white-light illumination device

Abstract

This invention provides a perovskite-containing composite material comprising a first green fluorescent material, a second green fluorescent material, and a red fluorescent material. The first green fluorescent material is a green perovskite quantum dot material coated with a first polymer. The second green fluorescent material is different from the first green fluorescent material.

Claims

1. A perovskite-containing composite material comprising: a first green fluorescent material, which is a green perovskite quantum dot material coated with a first polymer, wherein the green perovskite quantum dot material has the following chemical formula (I): APbBr3 Chemical formula (I) wherein A is a monovalent cesium cation; a second green fluorescent material, which is a non-perovskite quantum dot material; and a red fluorescent material.

2. The perovskite-containing composite material as described in claim 1, wherein the green perovskite quantum dot material has a core-shell structure with APbBr3 of chemical formula (I) as the core and the following chemical formula (II) as the shell: A4PbBr6 Chemical formula (II) wherein, The definition of A is the same as that in chemical formula (I).

3. The perovskite-containing composite material as claimed in claim 1, wherein the first polymer system is selected from the group consisting of: polyetherimide, polymethyl methacrylate, polyethyl methacrylate, polylauryl methacrylate, polyisobornyl acrylate, ethylene-vinyl acetate copolymer, polystyrene, polyvinyl chloride, polyvinyl acetate, polyethylene terephthalate, polyethylene oxide, polycarbonate, polyethylene, polypropylene, and combinations thereof.

4. The perovskite-containing composite material as claimed in claim 1, wherein the second green fluorescent material is selected from the group consisting of: Lu3Al5O12:Ce3+, Ba1-xSrxZrSi3O9:Eu2+, β-SiAlON:Eu2+, and combinations thereof.

5. The perovskite-containing composite material as claimed in claim 1, wherein the red fluorescent material is selected from the group consisting of: CaAlSiN3:Eu2+, K2SiF6:Mn4+, SrLiAl3N4:Eu2+, (Sr,Ca)AlSiN3:Eu2+, K2TiF4:Mn4+, and combinations thereof.

6. The perovskite-containing composite material as described in any one of claims 1 to 5, wherein the green perovskite quantum dot material has an absorption wavelength of 300 nanometers to 600 nanometers.

7. The perovskite-containing composite material as described in any one of claims 1 to 5, wherein the content of the first green fluorescent material is from 0.1% to 50% by weight based on the total weight of the first green fluorescent material, the second green fluorescent material and the red fluorescent material.

8. The perovskite-containing composite material as described in any one of claims 1 to 5, wherein the content of the green perovskite quantum dot material is from 0.02% to 50% by weight based on the weight of the first green fluorescent material, and the content of the first polymer is from 50% to 99.98% by weight.

9. A white light source device, comprising: a blue light emitting element; and a light conversion element disposed on the light emission path of the blue light emitting element, wherein the light conversion element comprises a perovskite-containing composite material as described in any one of claims 1 to 8, and the light generated by the perovskite-containing composite material being excited by a portion of the blue light emitted by the blue light emitting element combines with the blue light emitted by the blue light emitting element to form white light.

10. The white light source device as claimed in claim 9, wherein the blue light emitting element is a blue light diode chip.

11. The white light source device as claimed in claim 9 or 10, wherein the light conversion element further comprises an encapsulation in which the perovskite composite material is dispersed.

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