Quantum dot and preparation method thereof

A technology of quantum dots and multi-layer shells, applied in chemical instruments and methods, electrical components, nanotechnology, etc., can solve problems such as environmental hazards, high toxicity of quantum dots, and limited application fields, and achieve good thermal stability and high photochemical properties. Stability, the effect of improving quantum efficiency

Pending Publication Date: 2020-10-09
TOMI CHENGDU APPLIED TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, quantum dots have not been widely used in their application industries, and their applicable fields are very limited. The reason is that conventional quantum dots usually contain Cd elements, which are highly toxic and potentially dangerous to the environment.

Method used

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  • Quantum dot and preparation method thereof
  • Quantum dot and preparation method thereof
  • Quantum dot and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Example 1: Preparation of InZnP / AlP / ZnSe / ZnS multilayer shell quantum dots

[0091] Fabrication of InZnP cores:

[0092] Put indium iodide (Indium Iodide) 0.45mmol, zinc chloride (zinc chloride) 2.2mmol, oleylamine (oleylamine) 15mmol in a 100mL reactor, heated to 120 ℃ under vacuum for 1 hour, the reactor Converted to nitrogen atmosphere. After heating to about 180°C, a 1.6 mmol solution of tris(dimethylamino)phosphine (DMA3P) was rapidly injected and allowed to react for 5 minutes. Acetone was added to the rapidly cooled reaction solution at room temperature, and the solution was centrifuged. The precipitate obtained after separation is dispersed in cyclohexane or toluene. According to the results of UV spectroscopic analysis of the obtained InZnP semiconductor nanocrystals, the first UV absorption maximum wavelength range is 440nm-480nm.

[0093] Making the first shell of AlP:

[0094] Aluminium oleate was added to the reactor as a precursor for aluminium, wh...

Embodiment 2-6

[0105] Experiments were carried out according to the content of aluminum oleate. Synthesis Method Quantum dots were produced in the same manner as in Example 1. The produced quantum dots were analyzed for photoluminescence using excitation light of 365 nm or 458 nm. The results are shown in Table 1 below.

[0106] Table 1.

[0107] Aluminum Oleate Content (mmol) QY(%) FWHM Example 2 0.01 83 45 Example 3 0.02 85 40 Example 4 0.05 87 41 Example 5 0.1 90 39 Example 6 0.2 86 38

[0108] As can be seen from the results in Table 1, it was confirmed that the optical properties of quantum dots can be improved by the synthesis of the aluminum intermediate shell.

Embodiment 7-11

[0110] As the aluminum precursor, quantum dots were produced in the same manner as in Example 1, except that aluminum oleate was replaced with aluminum monostearate at the content shown in Table 2. The produced quantum dots were analyzed for photoluminescence using excitation light of 365 nm or 458 nm. The results are shown in Table 2.

[0111] Table 2.

[0112] Aluminum monostearate content (mmol) QY(%) FWHM Example 7 0.01 80 44 Example 8 0.02 83 45 Example 9 0.05 89 40 Example 10 0.1 86 39 Example 11 0.2 81 42

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Abstract

The invention relates to quantum dot and a preparation method thereof. The quantum dot is a multilayer shell quantum dot comprising a core comprising a IIIA-IIB-VA compound, a first shell layer disposed over the core and comprising a IIIA-VA compound, a second shell layer disposed over the first shell layer and comprising a first IIB-VIA compound, and a third shell layer disposed over the second shell layer and comprising a second IIB-VIA compound.

Description

technical field [0001] The present application relates to the field of luminescent materials, and particularly to luminescent quantum dots. Background technique [0002] Quantum dots (QDs) are nanometer-sized semiconductor substances. Due to the quantum confinement effect in which the smaller the size of the quantum dots, the larger the band gap, the quantum dots exhibit the characteristic of increased energy density. In particular, quantum dots have several advantages when compared with organic pigments in terms of their fluorescent properties: their spectrum is narrow and tunable, not only can they produce a symmetrical spectrum, but they are also externally photochemically stable. Therefore, quantum dots having a band gap equivalent to visible light and a direct band gap have the advantage of further improving the luminous efficiency. For quantum dots having a freely adjustable wavelength in the visible light region and excellent photostability, a representative applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/02H01L33/50B82Y20/00B82Y30/00
CPCC09K11/883C09K11/02H01L33/504B82Y20/00B82Y30/00
Inventor 徐昌焕尹成模
Owner TOMI CHENGDU APPLIED TECH RES INST CO LTD
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