Electron transport material and preparation method thereof, and QLED device
A technology of electron transport materials and metal ions, which is applied in the field of electron transport materials and its preparation, and QLED devices, can solve the problems of difficulty in improving the luminous efficiency of QLED devices, difficulty in improving the conductivity of zinc oxide, and limited solid solubility, so as to improve luminescence Efficiency and device performance, increasing the solid solubility limit, improving the effect of electrical conductivity
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[0031] Correspondingly, a specific embodiment of the present invention provides a method for preparing an electron transport material, comprising the following steps:
[0032] S01: Provide zinc salt and divalent doping metal salt, dissolve the zinc salt and the divalent doping metal salt in the first solvent, and obtain divalent metal ion-doped zinc oxide nanoparticles under alkaline conditions particle solution;
[0033] S02: removing the solvent and unreacted impurities in the zinc oxide nanoparticle solution doped with divalent metal ions to obtain zinc oxide nanoparticles doped with divalent metal ions;
[0034] S03: dissolving the zinc oxide nanoparticles doped with divalent metal ions in a second solvent to obtain a colloidal solution of zinc oxide doped with divalent metal ions;
[0035] S04: Deposit the zinc oxide colloidal solution doped with divalent metal ions on a substrate, and perform oxidation treatment to obtain the electron transport material.
[0036] The p...
Embodiment 1
[0069] The synthesis of iron ion-doped zinc oxide colloidal solution, the preparation of iron ion-doped zinc oxide electron transport material and its oxidation treatment process are described in detail below by taking the iron ion-doped zinc oxide electron transport material as an example.
[0070] First, an appropriate amount of zinc acetate and ferrous salt FeSO 4 Add to 50ml methanol solvent to form a mixed salt solution with a total concentration of 0.1mol / L, where Fe 2+The doping molar concentration is 20%. At the same time, an appropriate amount of potassium hydroxide powder is dissolved in another part of 50ml of methanol solvent to form a concentration of 0.3mol / L lye. The mixed salt solution was then heated to 50 °C, and potassium hydroxide solution was added dropwise until the molar ratio of hydroxide ions to metal ions was 1.7:1. After the infusion of the potassium hydroxide solution was completed, the mixed solution was continuously stirred at 50° C. for 2 h to ...
Embodiment 2
[0074] The synthesis of the chromium ion-doped zinc oxide colloidal solution, the preparation of the chromium ion-doped zinc oxide electron transport material and its oxidation treatment process are described in detail below by taking the chromium ion-doped zinc oxide electron transport material as an example.
[0075] First, an appropriate amount of zinc nitrate and divalent chromium salt CrCl 2 Add it into 50ml ethanol solvent to form a mixed salt solution with a total concentration of 0.1mol / L, wherein the doping molar concentration of Cr2+ is 15%. At the same time, an appropriate amount of lithium hydroxide powder was dissolved in another 50ml ethanol solvent to form a 0.2mol / L lye. The mixed salt solution was then heated to 40 °C, and lithium hydroxide solution was added dropwise until the molar ratio of hydroxide ions to metal ions was 1.9:1. After the lithium hydroxide solution was dripped, the mixed solution was stirred at 30° C. for 1 h to obtain a uniform transparen...
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