Solvent-Free Mechanosynthesis of Composition-Tunable Cesium Lead Halide Perovskite Quantum Dots

Abstract

A facile and green mechanosynthesis strategy free of solvent and high reaction temperature was developed to fabricate highly emissive cesium lead halide perovskite (CsPbX) quantum dots (QDs). Their composition can be adjusted conveniently simply through mechanically milling/grinding stoichiometric combinations of raw reagents, thereby introducing a broad luminescence tunability of the product with adjustable wavelength, line width, and photoluminescence quantum yield. Desired CsPbX QDs "library" can thus be readily constructed in a way like assembling Lego building blocks. Hence, the method offered new avenues in the preparation of multicomponent cocrystals, adding one appealing apparatus to the tool box of perovskite-type QDs synthesis. Intriguingly, photoinduced dynamic study revealed the hole-transfer process of the as-prepared QDs toward electron donors, indicative of their potential in charge-transfer-based applications such as light-harvesting devices and photocatalysis.

Mechanochemical synthesis of the lead-free double perovskite Cs2[AgIn]Br6 and its optical properties

“…It should be noted that a number of recent publications report on the synthesis Cs 2 [AgIn]Cl 6 [9,10], but its bromide analogue has, to the best of our knowledge, not been reported so far. We used a mechanochemical approach that previously been used successfully for the synthesis of lead halide perovskite materials [11][12][13][14][15]. This technique is advantageous for the formation of compounds with narrow existence region [16].…”

All‐Inorganic Perovskite Nanocrystals‐Based Light Emitting Diodes and Solar Cells

“…[41] In order to overcome the degradation of the nanocrystals from oleylamine, amine-free method have been reported by Yassitepe et al, where CsPbX 3 NCs show high PLQY, narrow emission spectra, and long stability. [42]…”

Metal halide perovskite nanocrystals and their applications in optoelectronic devices

“…In 1839, Russian mineralogist L. A. Perovski firstly proposed the perovskite crystal structure when studying calcium titanate (CaTiO 3 ) in the metamorphic rocks of the Ural Mountains. Since then, CaTiO 3 and later any compound denoted by a general chemical formula of ABX 3 are named as perovskite . Among metal halide perovskite materials, symbol A generally represents a monovalent organic cation or inorganic metal cation (eg, methylammonium [MA + , ], formamidinium [FA + , ], Cs + , Rb + ), symbol B is a bivalent metal cation (eg, Pb 2+ , Sn 2+ , Ge 2+ , Cu 2+ , Eu 2+ , and Ni 2+ ), symbol X represents one or mixed halide anions (Cl − , Br − , and I − ) (Figure ) …”

“…Since then, CaTiO 3 and later any compound denoted by a general chemical formula of ABX 3 are named as perovskite. [13][14][15][16] Among metal halide perovskite materials, symbol A generally represents a monovalent organic cation or inorganic metal cation (eg, methylammonium [MA + , CH 3 , symbol X represents one or mixed halide anions (Cl − , Br − , and I − ) ( Figure 1). [18][19][20][21][22][23] When the dimensions of a material decrease, the material usually gains a higher surface area to volume ratios.…”