Pressure-dependent optical behaviors of colloidal CdSe nanoplatelets

Zhou, Bo; Xiao, Guanjun; Yang, Xinyi; Li, Quanjun; Wang, Kai; Wang, Yingnan

doi:10.1039/c4nr07589g

Cited by 19 publications

(31 citation statements)

References 42 publications

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“…Nanocrystals (NCs) respond specifically to pressure with respect to phase progression, coherent crystal domain size, particle agglomeration, and morphology, accompanied by physical and chemical property modification. For example, high pressure can induce distinct textural coalescence of metallic Au/Ag NCs along with tuning the corresponding plasmonic resonance; (meta)stable phases in conventional semiconductors including CdSe and PbS/Pt;[15a,16] and alternation in the carrier dynamics in CdTe NCs and CsPbBr 3 perovskite nanocube superlattices …”

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confidence: 99%

“…The dissociation of the NCs is driven by PbBr 6 octahedral tilting and MA cation reorientation accompanying transformation to the orthorhombic polymorph. This growth mechanism differs from that in metallic/organic semiconductor nanoparticles (Au, Ag, CdSe, and PbS)[14a,15] and CsPbBr 3 perovskite quantum dots (QDs), i.e., pressure‐driven large single‐crystal formation from direct attachment and sintering of those nanoparticles. Although it is difficult to realize such high pressure in real applications, similar effects can be achieved by other means, such as chemical substitution, local strain, and tension.…”

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confidence: 99%

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High‐Pressure‐Induced Comminution and Recrystallization of CH₃NH₃PbBr₃ Nanocrystals as Large Thin Nanoplates

et al. 2017

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High pressure (HP) can drive the direct sintering of nanoparticle assemblies for Ag/Au, CdSe/PbS nanocrystals (NCs). Instead of direct sintering for the conventional nanocrystals, this study experimentally observes for the first time high-pressure-induced comminution and recrystallization of organic-inorganic hybrid perovskite nanocrystals into highly luminescent nanoplates with a shorter carrier lifetime. Such novel pressure response is attributed to the unique structural nature of hybrid perovskites under high pressure: during the drastic cubic-orthorhombic structural transformation at ≈2 GPa, (301) the crystal plane fully occupied by organic molecules possesses a higher surface energy, triggering the comminution of nanocrystals into nanoslices along such crystal plane. Beyond bulk perovskites, in which pressure-induced modifications on crystal structures and functional properties will disappear after pressure release, the pressure-formed variants, i.e., large (≈100 nm) and thin (<10 nm) perovskite nanoplates, are retained and these exhibit simultaneous photoluminescence emission enhancing (a 15-fold enhancement in the photoluminescence) and carrier lifetime shortening (from ≈18.3 ± 0.8 to ≈7.6 ± 0.5 ns) after releasing of pressure from 11 GPa. This pressure-induced comminution of hybrid perovskite NCs and a subsequent amorphization-recrystallization treatment offer the possibilities of engineering the advanced hybrid perovskites with specific properties.

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confidence: 99%

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confidence: 99%

High‐Pressure‐Induced Comminution and Recrystallization of CH₃NH₃PbBr₃ Nanocrystals as Large Thin Nanoplates

et al. 2017

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“…The distance inhibits the Förster resonance energy transfer (FRET) within QDs, thus reducing the nonradiative recombination caused by the FRET [ 19 , 20 ]. Furthermore, the elevated pressure in the QD-ZnS NIAM helps to transfer the assembly from a metastable structure to a stable structure that increases the overall stability, according to the literature [ 21 ]. In addition, the PL enhancement at the beginning can be explained by the reduced nonradiative recombination rates in QDs through thermal annealing according to reported studies [ 22 , 23 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Quantum Dot-ZnS Nanosheet Inorganic Assembly with Low Thermal Fluorescent Quenching for LED Application

Xie

Gao²,

Liu³

et al. 2017

Materials

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In this report, to tackle the thermal fluorescent quenching issue of II-VI semiconductor quantum dots (QDs), which hinders their on-chip packaging application to light-emitting diodes (LEDs), a QD-ZnS nanosheet inorganic assembly monolith (QD-ZnS NIAM) is developed through chemisorption of QDs on the surface of two-dimensional (2D) ZnS nanosheets and subsequent assembly of the nanosheets into a compact inorganic monolith. The QD-ZnS NIAM could reduce the thermal fluorescent quenching of QDs effectively, possibly due to fewer thermally induced permanent trap states and decreased Förster resonance energy transfer (FRET) among QDs when compared with those in a reference QD composite thin film. We have demonstrated that the QD-ZnS NIAM enables QDs to be directly packaged on-chip in LEDs with over 90% of their initial luminance being retained at above 85 °C, showing advantage in LED application in comparison with conventional QD composite film.

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“…www.angewandte.de surveyed, and the PL response of each geometry to different pressure states can be seen in Figure 10. [114][115][116][117][118][119][120][121] ThePLo f0D NCs subjected to highly anisotropic shock pressures were shown to initially blue-shift and eventually red-shift to their original position. [127][128][129] Theu nique behavior observed in these studies was ascribed to the complex interactions that dynamic shockwaves have on the loading matrixes.…”

Section: Discussionmentioning

confidence: 97%

“…Thep ressure dependence of the PL of 2D CdSe nanoplatelets (NPs) was also investigated. [121] Four and five monolayer (ML) CdSe NPs were loaded into aD AC with silicone liquid as the pressure medium. It was found that as the pressure increased, the PL of the NPs blue-shifted monotonically (ca.…”

Section: Methodsmentioning

confidence: 99%

Tailoring Optical Properties of Luminescent Semiconducting Nanocrystals through Hydrostatic, Anisotropic Static, and Dynamic Pressures

et al. 2021

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Studies on the hydrostatic-pressure-dependent optical properties of av ariety of metal-halide perovskites will be discussed below.M etal-halide perovskites (MHPs), which have the general formula ABX 3 [A = Cs + ,C H 3 NH 3 + (methylammonium, MA), HC(NH 3 ) 2 2+ (formamidinium, FA), etc.; B = Pb 2+ ,S n 2+ ,e tc.; and X = Cl, Br, or I],h ave been widely studied because of their tremendous potential for use in many optoelectronic applications,i ncluding solar cells, [18][19][20][21] LEDs, [22][23][24][25][26] photodetectors, [27,28] and scintillators. [29] Thee xceptional optical performance of MHPs can be attributed to their strong optical absorption, [30,31] low exciton binding energy, [32] long exciton diffusion lengths, [33] high carrier mobility, [34,35] defect tolerance, [36][37][38] and facile synthesis. [35,39] Lead-halide perovskites (LHPs) are ac lass of MHPs that have shown great promise as aresult of the abovementioned unique properties and their relatively high stability. [40] LHP NCs are of particular interest because of their extremely bright and narrow photoluminescence (PL) band and the ease of tuning their emission wavelengths by tuning both the halide composition and the size of the NCs. [41][42][43][44][45][46][47] Thef ollowing subsections will outline how the application of hydrostatic pressure alters the optical properties of avariety of LHP NCs. All-Inorganic CsPbX 3 PerovskitesCs + is acommonly used A-site cation in all-inorganic LHP NCs because its large ionic radius (R A = 1.88 )a llows the formation of astable perovskite phase,asdetermined by the Goldschmidt tolerance factor. [48] CsPbBr 3 NCs have been shown to possess an ear-unity photoluminescence quantum yield (PLQY), narrow (i.e.8 6meV) full width at half max (FWHM), and superior stability to both CsPbI 3 and CsPbCl 3 . [49,50] When subjected to hydrostatic pressures up to about 1.4 GPa, the PL spectra of CsPbBr 3 NCs was redshifted, widened, and decreased in intensity until ca. 1.3 GPa, at which pressure the PL was sharply quenched (Figure 1). [51] Thea uthors attributed the discontinuity to an isostructural phase transformation of the Pbnm space group. [51] Firstprinciple calculations suggested that the shift in the emission and the phase change were due to pressure-induced variations of the BrÀPb bond lengths and shrinkage of the Pb-Br-Pb bond angles within the lead bromide octahedra. [51] Interest-Angewandte Chemie Kurzaufsätze 9858 www.angewandte.de

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Pressure-dependent optical behaviors of colloidal CdSe nanoplatelets

Cited by 19 publications

References 42 publications

High‐Pressure‐Induced Comminution and Recrystallization of CH₃NH₃PbBr₃ Nanocrystals as Large Thin Nanoplates

High‐Pressure‐Induced Comminution and Recrystallization of CH₃NH₃PbBr₃ Nanocrystals as Large Thin Nanoplates

Synthesis of Quantum Dot-ZnS Nanosheet Inorganic Assembly with Low Thermal Fluorescent Quenching for LED Application

Tailoring Optical Properties of Luminescent Semiconducting Nanocrystals through Hydrostatic, Anisotropic Static, and Dynamic Pressures

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Pressure-dependent optical behaviors of colloidal CdSe nanoplatelets

Cited by 19 publications

References 42 publications

High‐Pressure‐Induced Comminution and Recrystallization of CH3NH3PbBr3 Nanocrystals as Large Thin Nanoplates

High‐Pressure‐Induced Comminution and Recrystallization of CH3NH3PbBr3 Nanocrystals as Large Thin Nanoplates

Synthesis of Quantum Dot-ZnS Nanosheet Inorganic Assembly with Low Thermal Fluorescent Quenching for LED Application

Tailoring Optical Properties of Luminescent Semiconducting Nanocrystals through Hydrostatic, Anisotropic Static, and Dynamic Pressures

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High‐Pressure‐Induced Comminution and Recrystallization of CH₃NH₃PbBr₃ Nanocrystals as Large Thin Nanoplates

High‐Pressure‐Induced Comminution and Recrystallization of CH₃NH₃PbBr₃ Nanocrystals as Large Thin Nanoplates