Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.265
Publication date: 18th July 2019
Luminescent colloidal perovskites CH3NH3PbBr3 have been synthesized for first time in 2014 by Schmidt el at. using octylammonium bromide as organic ligand in octadecene at 80 0C. They showed a photoluminescence (PL) quantum yield of 20 % and were used to prepare an electroluminescent device with a luminance response ten times higher than the perovskite bulk. [1] Soon after, the PL was increased up to 85% by a fine tuning of the precursor concentration. [2] The ligand assisted reprecipitation technique (LARP) developed by Zhang et al. enabled the preparation of the perovskites at room temperature and we used this novel procedure to prepare the brightest hybrid perovskites by using adamantyl ammonium bromide as unique ligand. [3-4] Host-guest chemistry on the perovskite surface (adamantyl moiety-cucurbituril) increased the water stability of the perovskite under continuous irradiation compared to that of the pristine perovskites; their long PL lifetime evidenced the formation of aggregates. Later on, we succeeded in the preparation of high luminescence quantum yield colloidal nanocrystals arising from individual nanoparticles by using the combination adamantyl amine/carboxylic acid of short C-length, thus enabling the preparation of thick conductive films. [5] Another way to obtain these colloidal nanoparticles was by means of the top-down technique, specifically laser ablation at 532 nm, where the organic ligand played a dual role as capping agent and as source of halide. [6]
Naked nanoparticles have also been prepared using K+ cation as capping to stabilize the colloid, which was used to prepare homogeneous solid films with arbitrary thickness and semiconducting properties. [7]
Recently, the mixing cyclohexanemethylammonium bromide with the precursors of CH3NH3PbBr3 perovskites and those of lead(II) polymers produced colloidal nanocomposite, which gave rise to long, 1D-well defined architectures when deposited on a hydrophobic surface. [8]
The key role of the ligands to control the morphology and the colloidal stability will be discussed as well as their importance into the final optical properties.
We thank MINECO CTQ2017-82711-P, partially co-financed with FEDER funds; predoctoral FPI grant to IRP and postdoctoral POP grant to SGC; Maria de Maeztu: MDM-2015-0538.
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