Yellow light LED based on inorganic non-lead antimony perovskite quantum dots and preparation method thereof

Abstract

The invention belongs to the technical field of semiconductor light-emitting devices, and particularly relates to a yellow light LED based on inorganic non-lead antimony perovskite quantum dots and apreparation method thereof. The preparation method comprises the following steps of: (1) synthesizing Cs3Sb2Br4.5I4.5 perovskite quantum dos by a ligand-assisted reprecipitation technology; (2) mixingthe Cs3Sb2Br4.5I4.5 perovskite quantum dots prepared in the step (1) with an epoxy resin adhesive to prepare a mixed solution of the epoxy resin adhesive and the Cs3Sb2Br4.5I4.5 perovskite quantum dots; (3) exciting the Cs3Sb2Br4.5I4.5 perovskite quantum dot powder by taking a commercial ultraviolet LED chip as an excitation light source to obtain a monochromatic yellow light LED. The preparationmethod of the device is simple and practicable and environmentally friendly, can overcome the toxicity and the instability of the traditional lead-based perovskite material; and moreover, the Cs3Sb2Br4.5I4.5 perovskite quantum dots are low in synthesis cost, mild in reaction conditions, short in production period, high in fluorescence quantum yield and good in development prospect.

Description

technical field [0001] The invention belongs to the technical field of semiconductor light-emitting devices, and in particular relates to a yellow light LED based on inorganic non-lead antimony-based perovskite quantum dots and a preparation method thereof. Background technique [0002] In the past two years, all-inorganic CsPbX 3 (X=Cl, Br, I) The potential application of perovskite quantum dots in the field of luminescence has attracted extensive research, which is mainly due to the high quantum yield of the material, adjustable energy band, wide color gamut and available Excellent optical properties such as solution processing. However, lead-based perovskite materials are facing two major problems in the application of light-emitting devices: (1) heavy metal lead is harmful to the human body and the natural environment, which limits its large-scale industrial application in the future; (2) traditional lead-based perovskite The material has poor stability and is very sen...

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Problems solved by technology

However, divalent Sn 2+ It is easily oxidized to form tetravalent Sn in the air environment 4+ , not only caused self-doping, but also caused the aging of luminescent materials (B.Yang, J.S.Chen, F.Hong, X.Mao, K.B.Zheng, S.Q.Yang, Y.J.Li, T.Pullerits, W.Q.Deng, and K.L .Han, Angew.Chem.129, 12645(2017); A.F.Wang, Y.Y.Guo, F.Muhammad, and Z.T.Deng, Chem.Mater.29, 6493(2017))

More importantly, the current CsSnX 3 The fluorescence quantum yield of perovskite quantum dots is still very low, the highest value is only 1.8%, which is far from meeting the application requirements of light-emitting devices

[0004] CN107880882A discloses a kind of antimony-based perovskite quantum dot and its preparation method, adopts high-temperature injection method, the synthesis process requires high temperature (90-120°C); requires inert gas protection (nitrogen or argon), resulting in increased synthesis cost; and Immediately after the high temperature reaction, an ice bath is required immediately, the experimental process is complicated and there is a certain risk

At present, there are no application reports of antimony-based perovskite quantum dot LEDs. If a higher fluorescence quantum yield can be obtained through optimization of the synthesis process, it will likely provide a new solution for the development of new, efficient, and green lighting sources. It has very important scientific significance and practical value

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