Spectroscopic properties of yellow and red InP/ZnSe/ZnS quantum dots

Cui, Yanyan; Wu, Qianqian; Li, Junzi; Gao, Yang; Cao, Fan; Yang, Xuyong; He, Tingchao

doi:10.1039/d4tc00925h

J. Mater. Chem. C

2024

DOI: 10.1039/d4tc00925h

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Spectroscopic properties of yellow and red InP/ZnSe/ZnS quantum dots

Yanyan Cui,

Qianqian Wu,

Junzi Li

et al.

Abstract: As promising fluorescent semiconductor materials, InP quantum dots (QDs) have been widely used in various applications. However, an in-depth understanding of fundamental optical properties of InP QDs is the premise...

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Cited by 3 publications

References 45 publications

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Recent progress on eco-friendly quantum dots for bioimaging and diagnostics

Lv,

Zhang,

et al. 2024

Nano Res.

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Recent progress on eco-friendly quantum dots for bioimaging and diagnostics

Lv,

Zhang,

et al. 2024

Nano Res.

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Hot Carrier Cooling and Multiphoton Absorption of Quasi-Type II ZnSeTe-Based Quantum Dots

Zhao,

Cui,

Duan

et al. 2024

Inorg. Chem.

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Ternary ZnSeTe quantum dots (QDs) are regarded as the most promising Cdfree blue emitters, while their fundamental optical properties such as hot carrier (HC) cooling process and multiphoton absorption (MPA) remain unclear, which will hinder their potential application. In this work, we compare the HC cooling processes of ZnSeTe/ZnSeS and ZnSeTe/ZnSeS/ZnS QDs and find that the HC cooling times of ZnSeTe/ZnSeS/ZnS QDs are insensitive to excitation intensity as a result of the suppressed hot-phonon bottleneck and Auger effect. Importantly, we have determined the two-to five-photon absorption cross sections of two kinds of QDs, highlighting the advantages of ZnS shells in enhancing MPA cross sections of ZnSeTe-based QDs. These insightful findings shed light on the underlying optical properties of ZnSeTe-based QDs and emphasize the critical role of the shell in engineering their HC cooling and MPA performance.

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Transition metal ions doped InP/ZnS quantum dots: toward the application of two-photon probes and type-I photosensitizers

Cui,

Luo,

Jin

et al. 2024

Opt. Express

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Semiconductor colloidal quantum dots (QDs) are technologically important for multiphoton bioimaging and photodynamic therapy applications. However, most semiconductor QDs have intrinsic cytotoxicity and small Stokes shifts, which hinder their applications in diagnosis and treatment. In this work, a series of transition metal ions doped InP/ZnS QDs, including Cu: InP/ZnS and Mn: InP/ZnS QDs, are synthesized, and their optical properties are characterized. Interestingly, these doped InP/ZnS QDs possess strong two-photon absorption cross sections at 700 nm (100 fs, 80 MHz), up to ∼1.5 × 104 GM for Cu: InP/ZnS QDs (0.5% Cu) and ∼8.8 × 103 GM for Mn: InP/ZnS QDs (40% Mn). Importantly, both undoped and doped InP/ZnS QDs can generate electron-hole pairs to produce •OH and O2•− under 800 nm photoexcitation, which can be used as two-photon excited type-I photosensitizers. These findings constitute a comprehensive understanding of the transitional metal ions doped InP/ZnS QDs as the two-photon fluorescence probes and type-I photosensitizers.

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Spectroscopic properties of yellow and red InP/ZnSe/ZnS quantum dots

Abstract: As promising fluorescent semiconductor materials, InP quantum dots (QDs) have been widely used in various applications. However, an in-depth understanding of fundamental optical properties of InP QDs is the premise...

Cited by 3 publications

References 45 publications

Recent progress on eco-friendly quantum dots for bioimaging and diagnostics

Recent progress on eco-friendly quantum dots for bioimaging and diagnostics

Hot Carrier Cooling and Multiphoton Absorption of Quasi-Type II ZnSeTe-Based Quantum Dots

Transition metal ions doped InP/ZnS quantum dots: toward the application of two-photon probes and type-I photosensitizers

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