Pressure-Induced Anomalous Emission Behaviors of MnS/ZnS Quantum Dots

Huang, Da; Rahman, Azizur; Wang, Xiangqi; Li, Xiangdong; Siddique, Hassan; Zhao, Wei; Dai, Rucheng; Wang, Zhongping; Zhang, Zengming

doi:10.1021/acs.jpcc.1c01160

Cited by 3 publications

(13 citation statements)

References 36 publications

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“…17,29 The 390 nm peak is attributed to exciton emission. In our previous work, 28 it appears more obviously under 325 nm excitation and shows a blue shift with increasing pressure, as shown in Figure S2. The fast 480 nm peak is attributed to emission from defects like impurities.…”

Section: ■ Results and Discussionsupporting

confidence: 56%

“…The intensity drop at 8.5 GPa is significant. 28 The pressure coefficient of the Mn 4 T 1 ( 4 G) peak changes a little (−52 meV/GPa), and so does that after about 10 μs (−51 meV/GPa), as shown in Figure 3g. At longer delays (Figure 3h,i), the pressure coefficients become remarkably smaller (−42 and −44 meV/GPa).…”

Section: ■ Results and Discussionmentioning

confidence: 88%

“…Its intensity shows an obvious decrease until it disappears, which is different from that reported in our previous work with 325 and 514 nm excitations. 28 Its excitation efficiency changes significantly near 355 nm, as it is at the band edge. 28,34 The band gap increases with the increasing pressure, 35 so the excitation efficiency at 355 nm decreases significantly, which causes the decrease in the PL intensity.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…28 Its excitation efficiency changes significantly near 355 nm, as it is at the band edge. 28,34 The band gap increases with the increasing pressure, 35 so the excitation efficiency at 355 nm decreases significantly, which causes the decrease in the PL intensity.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The energy/charge transfer processes from the host to Mn 2+ ions have attracted wide concern and enormous studies, while they are not completely known yet. 19−27 In our previous work, 28 we have employed high pressure X-ray diffraction (XRD) and high pressure photoluminescence (PL) techniques to explore the crystal structure, electronic structure and different PL components of MnS/ZnS core/shell QDs. The PL quenching of Mn 2+ emission under high pressure from 7.5 to 9.6 GPa is attributed to the crossover of 2 T 2 ( 2 I) and 4 T 1 ( 4 G) energy levels with subsequent enhancement of nonradiative relaxation.…”

Section: ■ Introductionmentioning

confidence: 99%

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Time-Resolved Photoluminescence Study of MnS/ZnS Core/Shell Quantum Dots at High Pressure and Low Temperature

et al. 2021

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Time-resolved photoluminescence experiments of MnS/ZnS core/shell QDs were performed at high pressure up to 11.7 GPa and low temperature down to 80 K. Four main emission components are observed and discussed: (1) an ultrafast broad blue–green peak attributed to ultrafast defects emission, (2) an ultrafast ultraviolet peak at about 390 nm attributed to exciton emission, (3) a fast blue peak attributed to fast defects emission, and (4) the slow Mn4T1(4G) orange emission. With increasing pressure, the exciton emission shows blue shift as the band gap increases. The Mn4T1(4G) emission has different pressure shift rates at different time delays, which originates from Mn ions in different environments. The emitting rate of the Mn4T1(4G) emission before 10 μs is coarsely constant, which gives a robust confirmation that the ns-scale fast PL decay component in historical controversy is not from the Mn4T1(4G) peak. With increasing temperature, both the ultrafast defects emission and the exciton emission attenuate, while the Mn4T1(4G) emission enhances. This is attributed to the enhanced energy/charge transfer from the exciton and the ultrafast defects states to Mn ions. These findings can give insights on the electronic structure, energy/charge transfer processes of this kind of material.

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Section: ■ Results and Discussionsupporting

confidence: 56%

Section: ■ Results and Discussionmentioning

confidence: 88%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Time-Resolved Photoluminescence Study of MnS/ZnS Core/Shell Quantum Dots at High Pressure and Low Temperature

et al. 2021

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Theoretical and Experimental Advances in High-Pressure Behaviors of Nanoparticles

Meng,

Vu,

Criscenti

et al. 2023

Chem. Rev.

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Using compressive mechanical forces, such as pressure, to induce crystallographic phase transitions and mesostructural changes while modulating material properties in nanoparticles (NPs) is a unique way to discover new phase behaviors, create novel nanostructures, and study emerging properties that are difficult to achieve under conventional conditions. In recent decades, NPs of a plethora of chemical compositions, sizes, shapes, surface ligands, and self-assembled mesostructures have been studied under pressure by in-situ scattering and/or spectroscopy techniques. As a result, the fundamental knowledge of pressure–structure–property relationships has been significantly improved, leading to a better understanding of the design guidelines for nanomaterial synthesis. In the present review, we discuss experimental progress in NP high-pressure research conducted primarily over roughly the past four years on semiconductor NPs, metal and metal oxide NPs, and perovskite NPs. We focus on the pressure-induced behaviors of NPs at both the atomic- and mesoscales, inorganic NP property changes upon compression, and the structural and property transitions of perovskite NPs under pressure. We further discuss in depth progress on molecular modeling, including simulations of ligand behavior, phase-change chalcogenides, layered transition metal dichalcogenides, boron nitride, and inorganic and hybrid organic–inorganic perovskites NPs. These models now provide both mechanistic explanations of experimental observations and predictive guidelines for future experimental design. We conclude with a summary and our insights on future directions for exploration of nanomaterial phase transition, coupling, growth, and nanoelectronic and photonic properties.

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Pressure- and Rate-Dependent Mechanoluminescence with Maximized Efficiency and Tunable Wavelength in ZnS: Mn²⁺, Eu³⁺

Wang

Chen

et al. 2023

ACS Appl. Mater. Interfaces

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Mechanoluminescence (ML) has received widespread attention because of potential application in stress sensors and imaging. However, pursuing highly efficient ML remains a challenge due to multifactorial limitations such as pressure and loading rate. Here, we systematically investigate pressure-and ratedependent ML in Mn 2+ and Eu 3+ co-doped ZnS in a gigapascal pressure range by using a high-pressure dynamic diamond anvil cell and microsecond time-resolved fluorescent methods and demonstrate the giant tunability in both ML efficiency and wavelength. Compressed from ambient pressure to 11 GPa at different compression rates, ZnS: Mn 2+ , Eu 3+ exhibits a volcano shape in ML emission efficiency with an optimum at ∼3.5 GPa and ∼211.1 GPa/s, at least 1000-fold higher than that measured in the MPa range. The pressure-dependent ML is accompanied with a tunable yellow-to-red emission color change. A combination of high-pressure X-ray diffraction and photoluminescence measurements reveals that the pressure-and ratedependent ML behavior derives from pressure-induced strengthening of the crystal piezoelectric field and enhanced interaction between the host lattice and doped ions with a significant change of the energy level of the Mn ion. Significantly, the highly efficient ML of ZnS: Mn 2+ , Eu 3+ at the GPa level is reproducible under a compression-decompression process and can be manipulated on a micron scale, implying great potential in mechanical-optical energy conversion and application in dynamic pressure imaging, stress sensors, and multicolor displays.

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Pressure-Induced Anomalous Emission Behaviors of MnS/ZnS Quantum Dots

Cited by 3 publications

References 36 publications

Time-Resolved Photoluminescence Study of MnS/ZnS Core/Shell Quantum Dots at High Pressure and Low Temperature

Time-Resolved Photoluminescence Study of MnS/ZnS Core/Shell Quantum Dots at High Pressure and Low Temperature

Theoretical and Experimental Advances in High-Pressure Behaviors of Nanoparticles

Pressure- and Rate-Dependent Mechanoluminescence with Maximized Efficiency and Tunable Wavelength in ZnS: Mn²⁺, Eu³⁺

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Pressure-Induced Anomalous Emission Behaviors of MnS/ZnS Quantum Dots

Cited by 3 publications

References 36 publications

Time-Resolved Photoluminescence Study of MnS/ZnS Core/Shell Quantum Dots at High Pressure and Low Temperature

Time-Resolved Photoluminescence Study of MnS/ZnS Core/Shell Quantum Dots at High Pressure and Low Temperature

Theoretical and Experimental Advances in High-Pressure Behaviors of Nanoparticles

Pressure- and Rate-Dependent Mechanoluminescence with Maximized Efficiency and Tunable Wavelength in ZnS: Mn2+, Eu3+

Contact Info

Product

Resources

About

Pressure- and Rate-Dependent Mechanoluminescence with Maximized Efficiency and Tunable Wavelength in ZnS: Mn²⁺, Eu³⁺