Large-area perovskite light-emitting film and light-emitting diode thereof
A technology of light-emitting diodes and light-emitting films, which is applied in the manufacture of electrical components, electric solid-state devices, semiconductor/solid-state devices, etc., can solve the problems of non-dense perovskite light-emitting films, high solution waste rate, low light-emitting efficiency, etc. Dense, smooth surface and uniform luminous intensity
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Embodiment 1
[0047] Preparation of PEABr:CsPbBr with different molar ratios 3 Large-area perovskite thin films:
[0048] (1) Preparation of perovskite precursor solution:
[0049] CsBr and PbBr 2 Soluble in the organic solvent of DMSO in equimolar ratio (CsBr=0.3M, PbBr 2 =0.3M), after mixing evenly, it was divided into five bottles of 1mL solution to prepare a 0.3M perovskite solution. Then add relative CsPbBr to these five bottles of solution 3 Solution molar ratio is 0%, 20%, 40%, 60% and 80% PEABr, obtains the (PEA) containing different molar ratio m (Cs) n-1 Pb n Br 3n+1 Precursor solution of type perovskite.
[0050] (2) (PEA) with different n values m (Cs) n-1 Pb n Br 3n+1 The preparation of large-area perovskite thin films of type perovskite is as follows figure 1 Shown:
[0051] In a glove box at a room temperature of 19°C, set the height difference between the scraper and the substrate to 220 μm, drop a volume of 26 μL of the perovskite precursor solution onto the g...
Embodiment 2
[0053] (1) Preparation of perovskite precursor solution:
[0054] 0.5mol CsBr and 0.5mol PbBr 2 Dissolve in DMSO organic solvent, mix well and then add relative to PbBr 2 40% molar ratio of PEABr yields (PEA) with an n value of 5 2 (Cs) 4 Pb 5 Br 16 Precursor solution of type perovskite.
[0055] (2) (PEA) with an n value of 5 2 (Cs) 4 Pb 5 Br 16 The method of preparing large-area perovskite thin films is as described in Example 1: the morphology of the perovskite thin films is as follows image 3 As shown, the thin film is dense, uniform and has high photoluminescence efficiency. Its photoluminescence efficiency is as Figure 7 Shown as high as 32.3%.
Embodiment 3
[0064] Preparation of PEABr:FAPbBr with different molar ratios 3 Large-area perovskite thin films:
[0065] (1) Preparation of perovskite precursor solution:
[0066] FABr and PbBr 2 Soluble in NMP organic solvent in equimolar ratio (CsBr=0.4M, PbBr 2 =0.4M), after mixing evenly, it was divided into five bottles of 1mL solution to prepare a 0.5M perovskite solution. Add relative FAPbBr to these five bottles of solution 3 Solutions with molar ratios of 0%, 20%, 40%, 60% and 80% PEABr obtained different n values of (PEA) m (FA) n-1 Pb n Br 3n+1 Precursor solution of type perovskite.
[0067] (2) (PEA) with different n values m (FA) n-1 Pb n Br 3n+1 The large-area perovskite thin film is prepared, and the preparation method is as described in Example 1.
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