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Quantum dot lasing from a waterproof and stretchable polymer film

Light(Science & Applications) 2022年第10期11卷 2435-2443页

作者： Mohammad Mohammadimasoudi pieter geiregat Frederik Van Acker Jeroen Beeckman Zeger Hens Tangi Aubert Kristiaan Neyts Nano-Bio-Photonics Lab Faculty of New Sciences and TechnologiesUniversity of TehranTehranIran Liquid Crystals and Photonics Group ELIS DepartmentGhent UniversityTechnologiepark-Zwijnaarde 1269052 ZwijnaardeBelgium Physics and Chemistry of Nanostructures Department of ChemistryGhent UniversityGhentBelgium Center for Nano-and Biophotonics(NB-Photonics) Ghent UniversityTechnologiepark-Zwijnaarde 1269052 ZwijnaardeBelgium

Colloidal quantum dots(QDs)are excellent optical gain materials that combine high material gain,a strong absorption of pump light,stability under strong light exposure and a suitability for solution-based *** integration of QDs in laser cavities that fully exploit the potential of these emerging optical materials remains,however,a *** this work,we report on a vertical cavity surface emitting laser,which consists of a thin film of QDs embedded between two layers of polymerized chiral liquid *** directed,circularly polarized defect mode lasing under nanosecond-pulsed excitation is demonstrated within the photonic band gap of the chiral liquid *** and long-term narrow-linewidth lasing of an exfoliated free-standing,flexible film under water is obtained at room ***,we show that the lasing wavelength of this flexible cavity shifts under influence of pressure,strain or *** such,the combination of solution processable and stable inorganic QDs with high chiral liquid crystal reflectivity and effective polymer encapsulation leads to a flexible device with long operational lifetime,that can be immersed in different protic solvents to act as a sensor.

关键词： lasing film polymer

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Dye-sensitized Er^(3+)-doped CaF_(2)nanoparticles for enhanced near-infrared emission at 1.5μm

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Photonics Research 2021年第10期9卷 2037-2045页

作者： JING LIU FLAVIA ARTIZZU MIN ZENG LUCA PILIA pieter geiregat RIK VAN DEUN Key Laboratory of Luminescence Analysis and Molecular Sensing Ministry of EducationSchool of Materials and EnergySouthwest UniversityChongqing 400715China Department of Chemistry Ghent UniversityB-9000 GhentBelgium Department of Sciences and Technological Innovation University of Eastern Piedmont“Amedeo Avogadro”15121 AlessandriaItaly Department of Mechanical Chemical and Material EngineeringUniversity of Cagliari09123 CagliariItaly

Lanthanide(Ln)-doped nanoparticles have shown potential for applications in various ***,the weak and narrow absorption bands of the Ln ions(Ln^(3+)),hamper efficient optical pumping and severely limit the emission *** sensitization is a promising way to boost the near-infrared(NIR)emission of Er^(3+),hence promoting possible application in optical amplification at 1.5μm,a region that is much sought after for telecommunication ***,we introduce the fluorescein isothiocyanate(FITC)organic dye with large absorption cross section as energy donor of small-sized(∼3.6 nm)Er^(3+)-doped CaF_(2)*** molecules on the surface of CaF_(2)work as antennas to efficiently absorb light,and provide the indirect sensitization of Er^(3+)boosting its *** this paper,we employ photoluminescence and transient absorption spectroscopy,as well as density functional theory calculations,to provide an in-depth investigation of the FITC→Er^(3+)energy transfer *** show that an energy transfer efficiency of over 89%is achieved in CaF_(2):Er^(3+)@FITC nanoparticles resulting in a 28 times enhancement of the Er^(3+)NIR emission with respect to bare CaF_(2):Er^(3+).Through the multidisciplinary approach used in our work,we are able to show that the reason for such high sensitization efficiency stems from the suitable size and geometry of the FITC dye with a localized transition dipole moment at a short distance from the surface of the nanoparticle.

关键词： process. absorption hence

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Localization-limited exciton oscillator strength in colloidal CdSe nanoplatelets revealed by the optically induced stark effect

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Light(Science & Applications) 2021年第6期10卷 1122-1132页

作者： pieter geiregat Carmelita Roda Ivo Tanghe Shalini Singh Alessio Di Giacomo Delphine Lebrun Gianluca Grimaldi Jorick Maes Dries Van Thourhout Iwan Moreels Arjan J.Houtepen Zeger Hens Physics and Chemistry of Nanostructures Department of ChemistryGhent UniversityGentBelgium. Center for Nano and Biophotonics Ghent UniversityGentBelgium. Photonics Research Group Ghent UniversityGentBelgium. Department of Chemical Sciences and Bernal Institute University of LimerickLimerickIreland. Center for Nanophotonics NWO-lnstitute AMOLFScience Park 1041098 XG AmsterdamThe Netherlands. Opto-Electronic Materials Section Department of Chemical EngineeringDelft UniversityDelftThe Netherlands

2D materials are considered for applications that require strong light-matter interaction because of the apparently giant oscillator strength of the exciton transitions in the absorbance ***,the effective oscillator strengths of these transitions have bee n scarcely reported,nor is there a con sistent interpretati on of the obtained ***,we analyse the transition dipole moment and the ensuing oscillator strength of the exciton transition in 2D CdSe nanoplatelets by means of the optically induced Stark effect(OSE).Intriguingly,we find that the exciton absorption line reacts to a high intensity optical field as a transition with an oscillator strength FStark that is 50 times smaller than expected based on the linear absorption *** propose that the pronounced exciton absorption line should be seen as the sum of multiple,low oscillator strength transitions,rather than a single high oscillator strength one,a feat we assign to strong exciton center-of-mass *** the quantum mechanical description of excitons,this 50-fold difference between both oscillator strengths corresponds to the ratio between the cohere nee area of the exciton's center of mass and the total area,which yields a coherence area of a mere 6.1 *** we find that the coherence area in creases with reducing temperature,we conclude that thermal effects,related to lattice vibrations,contribute to exciton *** further support of this localization model,we show that FStark is in dependent of the n anoplatelet area,correctly predicts the radiative lifetime,and lines up for strongly confined quantum dot systems.

关键词： coefficient. spectrum. oscillator

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