LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 4 of total 4

Search options

  1. Article ; Online: Spectroscopic Characterization of Thiacarbocyanine Dye Molecules Adsorbed on Hexagonal Boron Nitride

    Anne-Charlotte Nellissen / Eduard Fron / Jonathan B. F. Vandenwijngaerden / Steven De Feyter / Stijn F. L. Mertens / Mark Van der Auweraer

    ACS Omega, Vol 8, Iss 39, Pp 35638-

    a Time-Resolved Study

    2023  Volume 35652

    Keywords Chemistry ; QD1-999
    Language English
    Publishing date 2023-09-01T00:00:00Z
    Publisher American Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    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.

  2. Article: Structural and Photophysical Characterization of Ag Clusters in LTA Zeolites

    Fron, Eduard / Saleh Aghakhani / Wouter Baekelant / Didier Grandjean / Eduardo Coutino-Gonzalez / Mark Van der Auweraer / Maarten B. J. Roeffaers / Peter Lievens / Johan Hofkens

    Journal of physical chemistry. 2019 Feb. 26, v. 123, no. 16

    2019  

    Abstract: Ag clusters (AgCLs) confined within Na-exchanged Linde type A zeolites are studied by X-ray absorption and steady-state and time-resolved photoluminescence spectroscopies in a coordinated effort to elucidate the photophysical properties and link them to ... ...

    Abstract Ag clusters (AgCLs) confined within Na-exchanged Linde type A zeolites are studied by X-ray absorption and steady-state and time-resolved photoluminescence spectroscopies in a coordinated effort to elucidate the photophysical properties and link them to the precise cluster structure. The hydrated sodalite cage contains mostly tetrahedral [Ag₄(H₂O)₄] clusters located at the center of the sodalite cages, whereas octahedral Ag₆ clusters coordinated with the zeolite framework oxygen (OF) [Ag₆(OF)₁₄] are formed upon dehydration. The time-dependent density functional theory and electron spin resonance reports suggest that both Ag₄ and Ag₆ clusters have formally a double positive charge of 2+. Time-resolved spectroscopy shows that at room temperature, the emission of the hydrated sample decays with 3.4 ns from a state with the same multiplicity as the ground state. Upon dehydration, the entire excited-state dynamics speeds up to 1.2 ps. The microsecond-scale lifetimes observed at 77 K suggest the occurrence of two main decay processes for the initially populated singlet state: intersystem crossing and charge transfer. We show that the intersystem crossing yields the formation of a long-lived (409 μs) triplet state ³P from the ¹P state located at lower energy from which luminescence occurs. There is evidence that electron transfer is followed by electron–hole recombination or back electron transfer, yielding a relaxed singlet excited state. Upon removal of water ligands, the electrostatic field of the framework is enhanced, which leads to an increase in the rate constant of charge transfer due to stronger electronic coupling between Ag₆²⁺ and trap levels. The dependence of luminescence lifetime on the water content indicates a possible way to speed or delay the electron–hole recombination in a controlled way.
    Keywords X-radiation ; X-ray absorption spectroscopy ; absorption ; ambient temperature ; density functional theory ; electron paramagnetic resonance spectroscopy ; electron transfer ; energy ; ligands ; oxygen ; photoluminescence ; silver ; water content ; zeolites
    Language English
    Dates of publication 2019-0226
    Size p. 10630-10638.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1932-7455
    DOI 10.1021/acs.jpcc.9b00204
    Database NAL-Catalogue (AGRICOLA)

    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.

  3. Article: Silver Zeolite Composite-Based LEDs: Origin of Electroluminescence and Charge Transport

    Kennes, Koen / Cristina Martin / Wouter Baekelant / Eduardo Coutino-Gonzalez / Eduard Fron / Maarten B. J. Roeffaers / Johan Hofkens / Mark Van der Auweraer

    ACS applied materials & interfaces. 2019 Mar. 18, v. 11, no. 13

    2019  

    Abstract: In this contribution, we report on the first time use of silver-exchanged zeolites embedded in the nonconductive polystyrene (PS) and their use as hybrid emitters in light-emitting diodes (ZEOLEDs). The turn on voltage and EL intensity are strongly ... ...

    Abstract In this contribution, we report on the first time use of silver-exchanged zeolites embedded in the nonconductive polystyrene (PS) and their use as hybrid emitters in light-emitting diodes (ZEOLEDs). The turn on voltage and EL intensity are strongly dependent on the concentration of metal clusters. It is shown that the key to optimize this technology is improving the zeolite anode contact. Such an optimized device based on cheap abundant materials could provide an alternative for the commercial phosphor converted LEDs. A ZEOLED with a voltage polarity dependent color is demonstrated.
    Keywords anodes ; color ; electric potential difference ; electrochemiluminescence ; light emitting diodes ; polystyrenes ; zeolites
    Language English
    Dates of publication 2019-0318
    Size p. 12179-12183.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021/acsami.8b20534
    Database NAL-Catalogue (AGRICOLA)

    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.

  4. Article ; Online: Field-Controlled Charge Separation in a Conductive Matrix at the Single-Molecule Level

    Koen Kennes / Peter Dedecker / James A. Hutchison / Eduard Fron / Hiroshi Uji-i / Johan Hofkens / Mark Van der Auweraer

    ACS Omega, Vol 1, Iss 6, Pp 1383-

    Toward Controlling Single-Molecule Fluorescence Intermittency

    2016  Volume 1392

    Keywords Chemistry ; QD1-999
    Language English
    Publishing date 2016-12-01T00:00:00Z
    Publisher American Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    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.

To top