Efficient light-emitting sulfur selenium tellurium zinc cadmium/zinc sulfide quinary alloy core-shell structure quantum dot material and preparation method

Abstract

The invention discloses an efficient light-emitting sulfur selenium tellurium zinc cadmium / zinc sulfide quinary alloy core-shell structure quantum dot material and a preparation method. Liquid paraffin serves as a solvent, powdered sulfur serves as a sulfur source, selenium oxide powder serves as a selenium source, tellurium oxide serves as a tellurium powder source, zinc oxide serves as a zinc source, cadmium oxide serves as a cadmium source, liquid organic amine, liquid organic acid and liquid mercaptan serve as stabilizers, and heating reaction is performed in inert gas atmosphere to prepare an inner core of a sulfur selenium zinc cadmium telluride quinary alloy core. The liquid organic amine serves as a solvent, alkyl sulfhydryl serves as a sulfur source, zinc fatty acid serves as a zinc source, and heating reaction is performed in the inert gas atmosphere to grow a zinc sulfide shell. ZnCdSSeTe / ZnS quinary alloy core-shell structure quantum dots with adjustable light-emitting peakpositions, uniform shapes and sizes and high fluorescence quantum yield are controllably prepared by low-cost reaction raw materials and reaction solvents.

Description

technical field

[0001] The invention relates to a luminescent sulfur selenium telluride zinc cadmium / zinc sulfide five-element alloy core-shell structure quantum dot material and a preparation method. Background technique

[0002] Due to their excellent luminescent properties, quantum dot materials play an important role in basic research and industrial production of biomarkers, luminescent and display devices. So far, the common chemical synthesis methods of luminescent quantum dot materials usually use methyl cadmium, n-trioctylphosphine (TOP) and n-tributylphosphine (TBP), which are relatively expensive and difficult to store, as the surface ligands of nanocrystals. at 200-300 o C conditions to prepare quantum dots. (See C.M. Donega, S.G. Hickey, S.F.Wuister, D. Vanmaekelbergh, and A. Meijerink, J. Phys. Chem. B 2003, 107, 489.) This method not only has high raw material costs, unstable raw materials, but also requires harsh reaction conditions. Although in recent year...

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