Enhancing Photoluminescence Quantum Yield in 0D Metal Halides by Introducing Water Molecules

Abstract

Enhancing photoluminescence quantum yield (PLQY) is one of the most important issues in photoluminescent materials. Herein, a molecule design strategy to improve the PLQY in 0D metal halides is proposed. Two new lead‐free organic–inorganic metal halide hybrids with broadband orange emissions have been prepared with a PLQY increase of 57% from (C6N2H16)SbCl5 (I) to (C6N2H16)SbCl5⋅H2O (II) by introducing H2O molecules. These two compounds have very similar inorganic frameworks, except that the incorporation of water molecules in II increases the distance between the [SbCl5] polyhedra. It is revealed that the increase of PLQY is mainly attributed to the generation of more local photoelectrons resulting from the additional water molecules. This work provides a new insight to improve the PLQY for 0D environmentally friendly organic–inorganic metal halide hybrids and is beneficial for further photoluminescent material exploration.

Water Triggered Synthesis of Highly Stable and Biocompatible 1D Nanowire, 2D Nanoplatelet, and 3D Nanocube CsPbBr3 Perovskites for Multicolor Two-Photon Cell Imaging

“… 1 − 20 However, the major obstacle for future bioimaging material applications for perovskites is the poor stability in water due to their ionic nature. 21 − 43 As we and others have reported, CsPbX 3 perovskites decompose fast when exposed to water or kept in a moist environment. 28 − 40 As a result, enhancing the long-time stability of CsPbX 3 perovskites is the most important parameter to promote commercial applications.…”

“…It is now well-documented that the capping oleic acid (OA) and olamine (OAm) ligands are mostly coordinating at Pb sites. 33 − 43 …”

“… 28 − 36 These octahedral monomers help to form bigger hexagonal particles, which allows them to develop 3D CsPbBr 3 nanocubes, and they are protected by the hydroxy (OH) group. 33 − 43 …”

Indium-antimony-halide single crystals for high-efficiency white-light emission and anti-counterfeiting

“…PLQY and color rendering index of TDMPPbBr 4 could be further increased to 60% and 96 upon trace amount of Mn 2+ doping (27). Despite recent advances in singlesource white-light emission lead halides (28)(29)(30)(31)(32)(33)(34), the toxicity of Pb and the relatively low PLQY will notably hinder their future applications. Therefore, research on high-performance white emissive lead-free halides is of substantial importance; however, it is still in its infancy and remains to be thoroughly explored (35).…”

Zero-dimensional plate-shaped copper halide crystals with green-yellow emissions

“…31,32 The valence band and conduction band of (DTA) 2 Cu 2 I 4 are near flat, indicating the strong confinement effect for 0D OIMHs. 33 As shown in Figure 3b, the projected density-of-states (DOS) of their crystals show that the valence band of (DTA) 2 Cu 2 I 4 are contributed by Cu 3d and I 5p states, while the conduction band is contributed by Cu 4s states. Figure 2c, d show the charge densities of the valence band maximum (VBM) and conduction band minimum (CBM) are mainly distributed within the inorganic Cu−I clusters, respectively, indicating a zero electronic dimensionality and can explain the high quantum yields that has been found in experiments.…”