Ligand-modified synthesis of shape-controllable and highly luminescent CsPbBr₃ perovskite nanocrystals under ambient conditions

Abstract

The intrinsic insights of ligand-modified shape-transformation of CsPbBr3 nanocrystals between nanocubes and nanorods are revealed systematically, which can accelerate their practical applications in the optoelectronic field.

Shape-controlled synthesis of CsPbBr3 nanorods with bright pure blue emission and high stability

“…The CsPbBr 3 NRs at 80 1C exhibit a high PLQY and stability because a large aspect ratio can enhance the quantum confinement effect, increase the probability of exciton radiative recombination, and further affect the PLQY. 32,33 High-angle annular dark-field scanning transmission electron microscopy (STEM-HAADF) and energy dispersive X-ray (EDS) elemental mapping demonstrated the homogeneous distribution of Cs, Br and Pb in the NRs (Fig. 1g-j).…”

Intrinsic stability of perovskite materials and their operational stability in light-emitting diodes

“…MHPs are semiconductor materials with the general structural formula ABX 3 , where A represents an organic/inorganic cation such as methyl ammonium (CH 3 NH 3 + ), formamidinium (CH 3 C(NH)NH 3 + ), phenylethyl ammonium (C 6 H 5 CH 2 CH 2 NH 3 + ) or inorganic alkali cations like Cs + , Rb + , and their cocktail compositions. 9–12 B is the central metal atom in the MHP crystal structure and is commonly Pb 2+ , Sn 2+ , Zn 2+ , or Cu 2+ . The third X is the halide ion (Cl − , Br − , I − ).…”

“…MHPs are semiconductor materials with the general structural formula ABX 3 ) or inorganic alkali cations like Cs + , Rb + , and their cocktail compositions. [9][10][11][12] B is the central metal atom in the MHP crystal structure and is commonly Pb 2+ , Sn 2+ , Zn 2+ , or Cu 2+ . The third X is the halide ion (Cl À , Br À , I À ).…”

Alkali metal salt-assisted crystal structure switch of hybrid indium halides with near-unity photoluminescence quantum yield

“…These lead halide perovskite nanocrystals possess tunable bandgaps, high defect tolerance, tunable spectra from the visible to near-infrared range, and high-efficiency luminescence, among other advantages. [1][2][3][4][5][6][7] Furthermore, researchers have developed various synthesis and control methods, including morphology control, surface passivation, and ion doping, to reduce the defect density in nanocrystals and achieve efficient luminescence. [8][9][10][11][12][13] Despite extensive optimization of APbX 3 perovskite nanocrystals, their luminescence is still affected by factors such as reduced PLQY due to nanocrystal aggregation and poor stability, which greatly hinder their further application in optoelectronic devices.…”