Photophysics and its application in photon upconversion

Zhang, Yutong; Du, Wenna; Liu, Xinfeng

doi:10.1039/d3nr05450k

Nanoscale

2024

DOI: 10.1039/d3nr05450k

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Photophysics and its application in photon upconversion

Yutong Zhang,

Wenna Du,

Xinfeng Liu

Abstract: Photoluminescence (PL) upconversion is a phenomenon involving light-matter interaction, where the energy of the emitted photons is higher than that of the incident photon. PL upconversion has a promising application...

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Cited by 2 publications

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Optical and sign-flipping nonlinear optical properties of NiO/PMMA/PANI nanocomposite films

Sharma,

Karthikeyan

2024

Optical Materials

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Optical and sign-flipping nonlinear optical properties of NiO/PMMA/PANI nanocomposite films

Sharma,

Karthikeyan

2024

Optical Materials

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Photon Upconversion of Defect-Bound Excitons in hBN-Encapsulated MoS₂ Monolayer

Żuberek,

Olejnik,

Debus

et al. 2024

J. Phys. Chem. C

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Atomic defects associated with vacancies in twodimensional transition metal dichalcogenide monolayers efficiently trap charged carriers and strongly localize excitons. Defects in semiconducting monolayers are seldomly utilized for enhancing optical phenomena, although they may provide resonant intermediate states within the energy band gap for applications with multiphoton excitations, like highly efficient and thermally robust photon upconversion. In an MoS 2 monolayer encapsulated by hBN with high defect and resident electron densities, we observe an upconversion of localized exciton (X L ) emission with a huge energy gain of up to 290 meV. The upconverted X L emission is robust up to temperatures of about 120 K and exhibits a sublinear or a nearly linear laser power dependence for the energy gain of about 100 meV and above 200 meV, respectively. The upconversion mechanism is explained by a cooperative energy transfer process between the photocreated and resident electrons, in which hybridized pairs of single sulfur vacancies likely act as real intermediate states.Additionally, we find a weak upconversion of the neutral exciton photoluminescence with an energy gain of about 350 meV for quasi-resonant excitation of the X L exciton. It is attributed to a two-step, two-photon absorption.

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Photophysics and its application in photon upconversion

Abstract: Photoluminescence (PL) upconversion is a phenomenon involving light-matter interaction, where the energy of the emitted photons is higher than that of the incident photon. PL upconversion has a promising application...

Cited by 2 publications

References 170 publications

Optical and sign-flipping nonlinear optical properties of NiO/PMMA/PANI nanocomposite films

Optical and sign-flipping nonlinear optical properties of NiO/PMMA/PANI nanocomposite films

Photon Upconversion of Defect-Bound Excitons in hBN-Encapsulated MoS₂ Monolayer

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Photophysics and its application in photon upconversion

Abstract: Photoluminescence (PL) upconversion is a phenomenon involving light-matter interaction, where the energy of the emitted photons is higher than that of the incident photon. PL upconversion has a promising application...

Cited by 2 publications

References 170 publications

Optical and sign-flipping nonlinear optical properties of NiO/PMMA/PANI nanocomposite films

Optical and sign-flipping nonlinear optical properties of NiO/PMMA/PANI nanocomposite films

Photon Upconversion of Defect-Bound Excitons in hBN-Encapsulated MoS2 Monolayer

Contact Info

Product

Resources

About

Photon Upconversion of Defect-Bound Excitons in hBN-Encapsulated MoS₂ Monolayer