Non-flickering quantum dot and preparation method thereof, and quantum dot light emitting diode
A quantum dot luminescence and quantum dot technology, which is applied in the direction of luminescent materials, chemical instruments and methods, semiconductor/solid-state device manufacturing, etc., can solve the problems that quantum dot light-emitting diodes cannot meet the application in the field of lighting
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[0037] The present invention also provides the preparation method of described non-blinking quantum dots, comprising the following steps:
[0038] providing a dispersion of a core material, a dispersion of an inner shell material source, and a dispersion of an outer shell material source; the core material comprising CdSe or Cd m Zn 1-m Se, wherein, 0<m<1; the inner shell material source is a mixture of zinc source and selenium source; the outer shell material source is a mixture of zinc source and sulfur source, or a zinc oxygen source;
[0039] Under anaerobic conditions, the dispersion liquid of the inner shell material source is added dropwise to the dispersion liquid of the core material at a rate of 1-20 mL / h, and the in-situ growth on the surface of the core material The shell material is obtained from the dispersion liquid of the intermediate; the intermediate includes a core body and an inner shell layer coated on the surface of the core body;
[0040] Under anaerob...
Embodiment 1
[0079] Preparation of CdSe@8ZnSe-2ZnS:
[0080] Take 2×10 -7 Mmol, CdSe quantum dots with a particle size of 2.7nm were added to a mixed solution of 6mL octadecene and 6mL oleylamine to obtain a CdSe quantum dot solution;
[0081] Under nitrogen protection, the temperature was raised to 310°C at a speed of 18°C / min, and the liquid paraffin solution of zinc oleate (concentration was 0.1mmol / mL) and selenium powder (the mol ratio of zinc in zinc oleate and selenium powder was 1: 1) 8mL is added dropwise to the CdSe quantum dot solution at a rate of 4mL / h; after the dropwise addition, react for 1h to obtain an intermediate solution;
[0082] 5mL concentration of 0.1mmol / mL zinc oleate octadecane solution and 2mL octadecanethiol octadecadene solution were added dropwise to the intermediate solution; the rate of addition was 3mL / h; after the addition was complete, After reacting for 2 hours, a non-scintillation quantum dot solution was obtained.
[0083] Preparation of quantum d...
Embodiment 2
[0088] Preparation of CdSe@7ZnSe-1ZnO:
[0089] Take 2×10 -7 CdSe quantum dots with a particle size of 2.7nm in mmol and a particle size of 2.7nm were added to a mixed solution of 6mL octadecene and 6mL oleylamine to obtain a CdSe quantum dot solution; 0.1 solution of zinc oleate and selenium powder (the mol ratio of zinc in the zinc oleate and selenium powder is 1:1) 7mL is added dropwise in the described CdSe quantum dot solution, and the rate of addition is 4mL / h; , reacted for 1h to obtain an intermediate solution;
[0090] Add 2mL of liquid paraffin solution of zinc oleate with a concentration of 0.2mmol / mL and 1mL of octadecanethiol solution to the intermediate solution dropwise; the rate of addition is 3mL / h; after the addition is completed, the reaction After 1 h, a non-blinking quantum dot solution was obtained.
[0091] Preparation of quantum dot light-emitting diodes:
[0092] Treat the cleaned ITO glass substrate with a UV-ozone processor for 15 minutes, then s...
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