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  1. Article ; Online: Floquet Engineering of Excitons in Two-Dimensional Halide Perovskites via Biexciton States.

    Cai, Rui / Feng, Minjun / Kanwat, Anil / Furuhashi, Tomoki / Wang, Bo / Sum, Tze Chien

    Nano letters

    2024  Volume 24, Issue 11, Page(s) 3441–3447

    Abstract: Layered two-dimensional halide perovskites (2DHPs) exhibit exciting non-equilibrium properties that allow the manipulation of energy levels through coherent light-matter interactions. Under the Floquet picture, novel quantum states manifest through the ... ...

    Abstract Layered two-dimensional halide perovskites (2DHPs) exhibit exciting non-equilibrium properties that allow the manipulation of energy levels through coherent light-matter interactions. Under the Floquet picture, novel quantum states manifest through the optical Stark effect (OSE) following intense subresonant photoexcitation. Nevertheless, a detailed understanding of the influence of strong many-body interactions between excitons on the OSE in 2DHPs remains unclear. Herein, we uncover the crucial role of biexcitons in photon-dressed states and demonstrate precise optical control of the excitonic states via the biexcitonic OSE in 2DHPs. With fine step tuning of the driven energy, we fully parametrize the evolution of exciton resonance modulation. The biexcitonic OSE enables Floquet engineering of the exciton resonance with either a blue-shift or a red-shift of the energy levels. Our findings shed new light on the intricate nature of coherent light-matter interactions in 2DHPs and extend the degree of freedom for ultrafast coherent optical control over excitonic states.
    Language English
    Publishing date 2024-03-08
    Publishing country United States
    Document type Journal Article
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.4c00074
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Defect Passivation Using a Phosphonic Acid Surface Modifier for Efficient RP Perovskite Blue-Light-Emitting Diodes

    Mishra, Jayanta Kumar / Yantara, Natalia / Kanwat, Anil / Furuhashi, Tomoki / Ramesh, Sankaran / Salim, Teddy / Jamaludin, Nur Fadilah / Febriansyah, Benny / Ooi, Zi En / Mhaisalkar, Subodh / Sum, Tze Chien / Hippalgaonkar, Kedar / Mathews, Nripan

    ACS applied materials & interfaces. 2022 May 23, v. 14, no. 30

    2022  

    Abstract: Defect management strategies are vital for enhancing the performance of perovskite-based optoelectronic devices, such as perovskite-based light-emitting diodes (PeLEDs). As additives can fucntion both as acrystallization modifier and/or defect passivator, ...

    Abstract Defect management strategies are vital for enhancing the performance of perovskite-based optoelectronic devices, such as perovskite-based light-emitting diodes (PeLEDs). As additives can fucntion both as acrystallization modifier and/or defect passivator, a thorough study on the roles of additives is essential, especially for blue emissive Pe-LEDs, where the emission is strictly controlled by the n-domain distribution of the Ruddlesden–Popper (RP, L₂Aₙ–₁PbₙX₃ₙ₊₁, where L refers to a bulky cation, while A and X are monovalent cation, and halide anion, respectively) perovskite films. Of the various additives that are available, octyl phosphonic acid (OPA) is of immense interest because of its ability to bind with uncoordinated Pb²⁺ (notorious for nonradiative recombination) and therefore passivates them. Here, with the help of various spectroscopic techniques, such as X-ray photon-spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), and photoluminescence quantum yield (PLQY) measurements, we demonstrate the capability of OPA to bind and passivate unpaired Pb²⁺ defect sites. Modification to crystallization promoting higher n-domain formation is also observed from steady-state and transient absorption (TA) measurements. With OPA treatment, both the PLQY and EQE of the corresponding PeLED showed improvements up to 53% and 3.7% at peak emission wavelength of 485 nm, respectively.
    Keywords Fourier transform infrared spectroscopy ; X-radiation ; absorption ; cations ; crystallization ; phosphorous acid ; photoluminescence ; wavelengths
    Language English
    Dates of publication 2022-0523
    Size p. 34238-34246.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021/acsami.2c00899
    Database NAL-Catalogue (AGRICOLA)

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    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Article ; Online: Defect Passivation Using a Phosphonic Acid Surface Modifier for Efficient RP Perovskite Blue-Light-Emitting Diodes.

    Mishra, Jayanta Kumar / Yantara, Natalia / Kanwat, Anil / Furuhashi, Tomoki / Ramesh, Sankaran / Salim, Teddy / Jamaludin, Nur Fadilah / Febriansyah, Benny / Ooi, Zi En / Mhaisalkar, Subodh / Sum, Tze Chien / Hippalgaonkar, Kedar / Mathews, Nripan

    ACS applied materials & interfaces

    2022  Volume 14, Issue 30, Page(s) 34238–34246

    Abstract: Defect management strategies are vital for enhancing the performance of perovskite-based optoelectronic devices, such as perovskite-based light-emitting diodes (PeLEDs). As additives can fucntion both as acrystallization modifier and/or defect passivator, ...

    Abstract Defect management strategies are vital for enhancing the performance of perovskite-based optoelectronic devices, such as perovskite-based light-emitting diodes (PeLEDs). As additives can fucntion both as acrystallization modifier and/or defect passivator, a thorough study on the roles of additives is essential, especially for blue emissive Pe-LEDs, where the emission is strictly controlled by the
    Language English
    Publishing date 2022-05-23
    Publishing country United States
    Document type Journal Article ; Review
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.2c00899
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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