Original Article:
Hydrobromic acid-assisted size control of formamidinium lead bromide perovskite quantum dots at room temperature
Rui Qu, et al.
Optical Materials, 2021, 113, 110776.
10.1016/j.optmat.2020.110776
Formamidine lead bromide perovskite (FAPbBr3) nanostructures have attracted increasing attention due to their excellent optoelectronic performance and higher stability than their MA- and Cs-based counterparts. It is well known that the optoelectronic properties of NCs can be tuned by controlling their size and shape due to quantum confinement.
In this work, the researchers achieved size tunability of FAPbBr3 QDs by a simple ligand-assisted reprecipitation method with the amount of hydrobromic acid (HBr) added to the precursor as a variable. As the amount of HBr added to the precursor increases, the size of the synthesized QDs decreases, leading to an increase in the quantum confinement effect estimated by spectroscopy. Moreover, the prepared perovskite quantum dots can be used in optoelectronic devices such as photodetectors and light-emitting diodes.
Ligand Assisted Reprecipitation (LARP) Method
> First, a mixture of formamidine acetate, PbBr2, HBr, OA, and OLA was dissolved in DMF and vigorously stirred to obtain a perovskite precursor solution.
> Then, the precursor solutions with different HBr additives were quickly injected into the vigorously stirred toluene solvent.
> A series of precursor solutions were obtained by introducing additional HBr to the original precursor solution. Within seconds after the injection of the precursor solution in all samples, the solution glowed strongly under UV irradiation, demonstrating the rapid formation of perovskite FAPbBr3 QDs.
Chemicals Related in the Paper:
| Catalog Number | Product Name | Structure | CAS Number | Price |
|---|---|---|---|---|
| ACM13536599 | Hydrobromic acid-D |  |
13536-59-9 | Price |
| ACM40730947 | Formamidine acetate |  |
40730-94-7 | Price |
