Thick-shell core-shell quantum dots are widely used in LED display, solar energy, and biological applications due to their high stability and large stokes-shift; especially red, green, blue, and three primary colors. It has a wide range of applications in QLED backlighting and display. However, the thick-shell core-shell quantum dots that have been reported so far are mainly red CdSe/CdS core-shell quantum dots, which is still difficult to prepare green, narrow half-width quantum dots.
So far, a small number of companies and schools have been working on the preparation of thick-shell core-shell quantum dots. For example, the Monaco Institute of Advanced Technology reported that the green-emitting CdSe//ZnS/CdSZnS alloy core-shell quantum has a quantum yield of 100% and can retain 71% of initial luminescence intensity after being compounded with silicone resin; Alkyl phosphates are costly. A well-known foreign university reported high-efficiency green-emitting Cd1?xZnxSe/ZnSe/ZnS quantum dots, but its half-width is wide, and no wavelength-tunable results are reported. A famous domestic professor research group reported the preparation of red-emitting thick-shell CdSe/CdS core-shell quantum dots, but its preparation method is difficult to apply to green-emitting core-shell quantum dots. Therefore, the shortcomings of existing methods largely limit the wide application of thick core-shell quantum dots.
The invention can effectively remove the Cd2+ plasma which is not completely reacted for the incompletely reacted CdSe (<530 nm) quantum dots, and then can effectively control the core-shell quantum dot emission peak. Therefore, the invention has a wider application range and can be applied to the preparation of thick-shell core-shell quantum dots of multiple wavelength ranges such as green and red. It is especially suitable for the preparation of thick-shell green quantum dots and the shell growth of incompletely reacted quantum dot nuclei (that is, the system contains a large amount of unreacted core matrix, which will greatly affect the growth of the shell if not removed).
Compared with the existing preparation method, it has the following advantages:
1, low cost
2. The wavelength is adjustable, the width of the half peak is narrow, and the quantum yield is high.
3. There is no red shift in the quantum dot emission peak.
4. The high-efficiency and stable green light quantum dots in the invention are advantageous for industrial mass production.
The invention provides a simple and economical method for preparing high-efficiency green light-emitting core-shell quantum dots, which is based on an organic phosphonium reagent-assisted quantum dot extraction purification process, and can prepare wavelength controllable, half-width narrow, quantum yield The high-thickness shell-core quantum dots can greatly improve the stability of quantum dots compared with other preparation methods.
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