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Blue-green light-emitting quantum dot and preparation method thereof

A technology of luminescent quantum and quantum dots, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of cumbersome preparation process, poor stability, and low quantum yield, and achieve the goal of simplifying the production process, reducing the cost of raw materials, and increasing the output Effect

Active Publication Date: 2016-07-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although ternary quantum dots can be obtained by preparing this core / multi-shell structure, the preparation process of this core / multi-shell structure requires relatively more precursors, and the preparation process is cumbersome. Moreover, this core / multi-shell structure The quantum yield of multilayer-shell quantum dots is not high, the stability is poor, and the brightness is not high in the actual process

Method used

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  • Blue-green light-emitting quantum dot and preparation method thereof
  • Blue-green light-emitting quantum dot and preparation method thereof
  • Blue-green light-emitting quantum dot and preparation method thereof

Examples

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preparation example Construction

[0027] The above-mentioned blue-green light-emitting quantum dots provided by the present invention can be produced by referring to existing conventional methods. In a preferred embodiment of the present invention, a method for preparing the above-mentioned blue-green light-emitting quantum dots is provided. The preparation method includes The following steps: prepare the Zn-Cd precursor stock solution, mix the Zn-Cd precursor stock solution with S and / or Se to prepare Zn n Cd 1-n S m Se 1-m Quantum dots; and Zn n Cd 1-n S m Se 1-mThe shell is a nuclear epitaxial growth shell, and the shell is a ZnS shell, a ZnSe shell or a CdS shell.

[0028] The method for preparing the blue-green light-emitting quantum dots provided by the present invention reduces the cost of raw materials and reduces the toxicity by adopting a phosphine-free method. Prepared Zn n Cd 1-n S m Se 1-m The lattice matching degree between the quantum dots and the shell is higher, thereby simplifying ...

Embodiment 1

[0074] Preparation of Zn 0.5 Cd 0.5 S 0.5 Se 0.5 / ZnS quantum dot, its preparation method comprises the following steps:

[0075] (1) Preparation of precursor

[0076] a) Preparation of Zn-Cd precursor stock solution

[0077] Put 4.5mmol of ZnO, 4.5mmol of CdO, 27mmol of OA, and 21ml of liquid paraffin in a 50ml three-neck bottle. Under the protection of nitrogen, heat up to 100°C and exhaust for 30min, then heat up to 300°C and react for 80min. Cool to 140°C to get Zn 0.5 Cd 0.5 -OA precursor spare.

[0078] b) Preparation of Zn precursor stock solution

[0079] Put 3mmol of ZnO, 15mmol of OA, and 22ml of liquid paraffin in a 50ml three-neck flask, under the protection of nitrogen, heat up to 100°C to exhaust for 30min, then heat up to 310°C for 80min, then cool to 100°C to obtain The Zn-OA precursor is spare.

[0080] c) Preparation of S precursor (S-ODE) stock solution.

[0081] Put 2mmol of S and 20ml of ODE in a 50ml three-neck flask, under the protection of ni...

Embodiment 2-7

[0089] The quantum dots prepared in Examples 2-7 are shown in Table 2, and their preparation methods refer to Example 1.

[0090] Table 2.

[0091]

quantum dot

Example 1

Zn 0.5 Cd 0.5 S 0.5 Se 0.5 / ZnS

Example 2

Zn 0.5 Cd 0.5 S 0.75 Se 0.25 / ZnS

Example 3

Zn 0.5 Cd 0.5 S 0.9 Se 0.1 / ZnS

Example 4

Zn 0.5 CD 0.5 S 0.25 Se 0.75 / ZnS

Example 5

Zn 0.5 Cd 0.5 S 0.1 Se 0.9 / ZnS

Example 6

Zn 0.5 Cd 0.5 S / ZnS

Example 7

Zn 0.5 Cd 0.5 Se 0.9 / ZnS

[0092] (3) Zn prepared by embodiments 1 to 5 0.5 Cd 0.5 S m Se 1-m Detection of quantum dots:

[0093] (1) Fluorescence and absorption spectrum test:

[0094] Test instrument: PC2000-ISA spectrometer of OceanOptics is the fluorescence and absorption spectrometer, and the excitation light source is a 365nm portable ultraviolet lamp.

[0095] Test result: if figure 1 shown.

[0096] figure...

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Abstract

The invention discloses a blue-green light-emitting quantum dot and a preparation method thereof. The blue-green light-emitting quantum dot comprises a ZnnCd1-nSmSe1-m core and a shell coating the ZnnCd1-nSmSe1-m core. In the ZnnCd1-nSmSe1-m core, n is greater than 0 and is less than 1, m is greater than or equal to 0 and less than or equal to 1 and the shell is a ZnS shell, a ZnSe shell or a CdS shell. The blue-green light-emitting quantum dot comprises the ZnnCd1-nX quantum dot as a core and the epitaxial growth ZnS shell, ZnSe shell or CdS shell so that a quantum dot structure is simplified. Through a core-shell structure, a lattice mismatch degree of the core-shell structure is reduced. The blue-green light-emitting quantum dot formed in a wavelength scope of 450-550nm so that the QD-LED maximum brightness of the blue-green light-emitting quantum dot is 4700cd / m<2> or more.

Description

technical field [0001] The invention relates to the field of semiconductor materials, in particular to a blue-green luminescent quantum dot and a preparation method thereof. Background technique [0002] Quantum dots, also known as nanocrystals, are nanoparticles composed of II-VI or III-V elements. In quantum dots, electrons and holes are quantum-confined, and the continuous energy band structure becomes a discrete energy level structure with molecular characteristics, which can emit fluorescence after being excited. Based on quantum effects, quantum dots have broad application prospects in solar cells, light-emitting devices, optical biomarkers and other fields. [0003] With the rapid development of QD-LED device research, the performance parameters of red and green LEDs can meet the application requirements, but the performance indicators of blue LEDs are still very low. At present, the status and problems of blue-green light-emitting quantum dots suitable for blue LED...

Claims

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Application Information

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IPC IPC(8): C09K11/88C09K11/02
Inventor 赵严帅周维
Owner BYD CO LTD
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