Cadmium-free quantum dot nanoparticles

A technology of nanoparticles and quantum dots, applied in the field of quantum dot nanoparticles, can solve problems such as difficulty in obtaining

Active Publication Date: 2016-08-24
NANOCO TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second factor is that, in the case of semiconductor nanoparticles, there is a variation in the electronic properties of the material with the size of the particle
Because Ostwald ripening breaks down smaller QDs and promotes the growth of larger QDs, this process makes it difficult to obtain QDs that emit at shorter wavelengths, i.e., in the blue and green regions of the visible spectrum

Method used

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  • Cadmium-free quantum dot nanoparticles
  • Cadmium-free quantum dot nanoparticles
  • Cadmium-free quantum dot nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Magnesium-containing core.

[0043] Magnesium myristate was prepared by heating magnesium acetate tetrahydrate (2.92 g) and myristic acid (12.4 g) to 110° C. under vacuum until the solution became clear and no more liquid was produced. This freshly prepared magnesium myristate was used in the following synthesis: Indium myristate (4.55 g), magnesium myristate (2.33 mL), myristic acid (0.76 g) and Therminol 66 (50 mL) were placed in an apparatus In a dry 250 mL round bottom flask with air condenser, nitrogen inlet, suba seal, thermocouple and stir bar, and degas under vacuum at 100 °C for 1 hour. The reaction was then placed under a nitrogen atmosphere and zinc sulfide clusters (1.35 g, prepared as described in US Pat. No. 8,062,703) were added. The reaction was then degassed under vacuum for another 1 / 2 hour, and then placed under a nitrogen atmosphere. A solution of tris(trimethylsilyl)phosphine (1 M in diphenyl ether) was added dropwise while increasing...

Embodiment 2

[0046] Example 2: Cores containing zinc and magnesium

[0047] Indium myristate (11.74 g), zinc acetate (0.734 g), magnesium stearate (0.591 g) and myristic acid (1.507 g) were stirred in 100 mL of Therminol 66 and heated to 100°C. Zinc sulfide clusters (2.7 g, prepared as described in US Pat. No. 8,062,703) were added. Trimethylsilylphosphine (18.5 mmol) was added at a rate of 7.2 mL / hour, and the reaction mixture was heated to 195° C. and allowed to anneal for 140 hours.

Embodiment 3

[0048] Example 3: Cores Containing Zinc and Aluminum

[0049] Indium myristate (11.74 g), zinc acetate (0.734 g), aluminum stearate (0.877 g) and myristic acid (1.507 g) were stirred in 100 mL of Therminol 66 and heated to 100°C. Zinc sulfide clusters (2.7 g, prepared as described in US Pat. No. 8,062,703) were added. Trimethylsilylphosphine (18.5 mmol) was added at a rate of 7.2 mL / hour, and the reaction mixture was heated to 195° C. and allowed to anneal for 140 hours.

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PUM

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Abstract

The invention discloses cadmium-free quantum dot nanoparticles. Quantum dot semiconductor nanoparticle compositions that incorporate ions such as zinc, aluminum, calcium, or magnesium into the quantum dot core have been found to be more stable to Ostwald ripening. A core-shell quantum dot may have a core of a semiconductor material that includes indium, magnesium, and phosphorus ions. Ions such as zinc, calcium, and/or aluminum may be included in addition to, or in place of, magnesium. The core may further include other ions, such as selenium, and/or sulfur. The core may be coated with one (or more) shells of semiconductor material. Example shell semiconductor materials include semiconductors containing zinc, sulfur, selenium, iron and/or oxygen ions.

Description

[0001] Cross references to related applications: [0002] This application claims the benefit of US Provisional Application No. 61 / 924,031, filed January 6, 2014. [0003] Statement Regarding Federally Sponsored Research or Development: Not Applicable Background of the invention [0004] 1. Field of invention. [0005] The present invention generally relates to quantum dot nanoparticles. More specifically, it relates to the synthesis of quantum dot nanoparticles that do not contain cadmium or other heavy metals. [0006] 2. Includes descriptions of related art based on information disclosed in 37 CFR 1.97 and 1.98. [0007] There has been substantial interest in the preparation and characterization of compound semiconductor particles, commonly referred to as quantum dots (QDs) and / or nanocrystals, with dimensions on the order of 2-100 nm. This interest is mainly due to their size-tunable electronic, optical and chemical properties. For example, many QDs show relatively s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/71C09K11/70B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C09K11/70C09K11/703C09K11/71B22F1/16B22F1/054B22F9/24C09C3/063C09K11/62B01J13/02C09K11/623C09K11/64C01P2002/84C01P2006/60C01B25/088C01P2004/64C01P2006/40Y10S977/774Y10S977/892B82Y20/00H01L33/005H01L33/502H01L2933/0041C09B67/0097
Inventor 保罗·安东尼·格拉维詹姆斯·哈里斯史蒂文·丹尼尔斯奈杰尔·皮克特阿伦·纳拉亚纳斯瓦米
Owner NANOCO TECH LTD
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