A Facile Phosphine‐Free Method for Synthesizing PbSe Nanocrystals with Strong Optical Limiting Effects

Abstract

PbSe semiconductor nanocrystals (NCs) have attracted ever-growing interest owing to both their fundamental physics and potential applications in a diverse range of fields such as optoelectronic devices and nonlinear optics. The current fabrication strategy for colloidal PbSe NCs, however, frequently involves acutely toxic reagents and tedious reaction procedures, and is plagued by products with poorly controlled size and morphology. Herein, we report a facile, low-cost, and phosphine-free method for synthesizing PbSe NCs, which provides highly uniform NCs with tunable mid-IR absorption, and they are promising for bio-related applications. These high quality NCs were obtained by the reaction of elemental Se and PbCl2 in oleylamine as both the ligand and reaction medium. The high flexibility and reproducibility of the method reported in this study allows us to synthesize monodispersed PbSe NCs with well-controlled size and morphology. In addition, these products show strong optical limiting effects, and thus hold potential for developing nonlinear optical devices.

Allyloxyporphyrin‐Functionalized Multiwalled Carbon Nanotubes: Synthesis by Radical Polymerization and Enhanced Optical‐Limiting Properties

“…[56] As shown in Figure 8, all samples display a similar trend, that is, the output fluence increases linearly with the input fluence by obeying Beer's law at low incident energies, and deviates from linearity as the input fluence increases indicating the occurrence of an OL effect. [57][58] The decrease in output fluence of MWCNT-TPP with increasing fluence exceeds that of all other samples in the present study. The extent of the decrease in output fluence (MWCNT-TPP > TPP > MWCNT-AIBN > MWCNTs) suggests that the OL performance of MWCNT-TPP is better than those of the MWCNT-AIBN and the individual porphyrin and MWCNTs.…”

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

“…As examples, lead-based nanocrystals were reported by some authors. These were prepared by mixing PbCl 2 and elemental selenium and/or sulfur in oleylamine, , and presented strong optical limiting effects. Also, Trivedi et al .…”

“…As examples, lead-based nanocrystals were reported by some authors. These were prepared by mixing PbCl 2 and elemental selenium and/or sulfur in oleylamine, 266,267 and presented strong optical limiting effects. Also, Trivedi et al 268 produced Cd 0.55 Mn 0.45 Te:V crystals for electrical OL at 780, 895, and 1064 nm, while other authors used Sr 6 Ba 4 Nb 2 O 6 crystals, 269 attaining a prototype device.…”

Utilizing Sn Precursor To Promote the Nucleation of PbSe Quantum Dots with in Situ Halide Passivation

“…This reaction scheme is easy to obtain large sized QDs but unable to form QDs with size smaller than 3 nm owing to the low reactivity between Pb-precursor and OLA-Se. 21 Also, utilizing PbO as lead source will achieve larger size than utilizing PbCl 2 as lead source (to be proved in following section). In this work, costeffective source such as PbCl 2 , PbO, SnCl 2 , elemental Se rather than 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 9 with large amounts of PbCl 2 suspending in the dispersion liquid was obtained ( Figure 1a, the right).…”

“…In addition, directly dissolving Se powder in oleylamine at high temperature is a good phosphine-free method, but it is difficult to obtain small QDs due to the low reactivity between the Pb source and OLA− Se. 21 If the reactivity is too high, nucleation will control the growth and PbSe QDs will exhibit large size dispersion. 19 Owing to the extremely high reactivity between the Sn source and OLA−Se, SnCl 2 was utilized as the promoting agent of the fast nucleation of nanocrystals for the first time.…”