A kind of quantum dot film and preparation method thereof
A thin film preparation and quantum dot technology, which is applied in chemical instruments and methods, semiconductor/solid-state device manufacturing, semiconductor devices, etc., can solve the problems of not paying attention to the stability of quantum dots, so as to improve the water and oxygen barrier performance, easy to control the thickness, Guarantees the effect of luminous performance
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[0027] A method for preparing a quantum dot thin film provided in an embodiment of the present invention includes the following steps:
[0028] S1 Obtain quantum dots by thermal injection or room temperature synthesis, and dissolve them in toluene, inject tetramethoxysilane (TMOS) or tetramethoxysilane (TMOS) or tetraethyl orthosilicate (TEOS) into it with a syringe under the condition of rapid stirring and fully Stir to make the silicon dioxide produced by hydrolysis coat the quantum dots to form quantum dot microspheres 1 to obtain a quantum dot microsphere solution;
[0029] S2 Mix the quantum dot microsphere solution with the organic polymer solution, and stir fully so that the quantum dot microsphere 1 is evenly dispersed in the organic polymer solution to obtain a mixture, and then inject the mixture onto a clean glass sheet, and place it in a vacuum-dried It is solidified into a film in the box to obtain the initial quantum dot film;
[0030] S3 adopts the low-temperat...
Embodiment 1
[0035] Using green light CsPbBr 3 (Green light perovskite) quantum dots to prepare quantum dot films, the particle size of the quantum dots is less than 10nm, the emission peak is at 508nm, and there are organic ligands on the surface. The specific preparation steps are as follows:
[0036] S1 Preparation of quantum dots: Mix cesium stearate with octadecyl and oleic acid, heat and dissolve at 100°C to obtain the Cs precursor for later use; add lead bromide, oleic acid, oleylamine and octadecyl into a four-necked flask , heated to 100°C under vacuum, magnetically stirred at a speed of 700r / min while heating, kept at 100°C and continued to heat for 30min, then gradually heated to 155°C under a nitrogen atmosphere, and quickly injected the prepared Cs precursor into it , stay for about 3s, put it into an ice-water bath to cool; after cooling to 25°C, take it out and put it into a centrifuge tube, add ethyl acetate as an anti-solvent at a ratio of 2:1, then centrifuge at 7000r / min...
Embodiment 2
[0041] Synthesis of CsPbBr at room temperature 3 (Green light perovskite) quantum dots to prepare quantum dot films, the particle size of the quantum dots is less than 10nm, the emission peak is at 518nm, and there are organic ligands on the surface. The specific preparation steps are as follows:
[0042] S1 preparation of quantum dots: CsBr, PbBr 2 , oleic acid and oleylamine were added to N,N-dimethylformamide (DMF), the mixed solution was magnetically stirred at 90°C for 2 hours to obtain a clear solution, and then the above clear solution was quickly injected into toluene to obtain green light quantum dots;
[0043] S2 Preparation of quantum dot microspheres: placing the above quantum dot solution in a flask, quickly injecting TMOS at a speed of 1500r / min, and then fully stirring at room temperature for 20h to obtain a quantum dot microsphere solution;
[0044]S3 preparation of the initial quantum dot film: put PMMA in toluene, dissolve at 80 ° C, stir while heating, stir...
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