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Coarse and fine-tuning of lasing transverse electromagnetic modes in coupled all-inorganic perovskite quantum dots

Nano Research 2021年第1期14卷 108-113页

作者： Youngsin Park Guanhua Ying atanu jana Vitaly Osokin Claudius C.Kocher Tristan Farrow Robert A.Taylor Kwang S.Kim School of Natural Science Ulsan National Institute of Science and TechnologhUlsan 44919Republic of Korea Clarendon Laboratory Department of PhysicsUniversity of OxfordParks RoadOxford OX13PUUK Centre for Quantum Technologies National University of SingaporeScience Drive 2Singapore 117543Singapore

Inorganic perovskite lasers are of particular interest,with much recent work focusing on Fabry-P6rot cavity-forming *** demonstrate the direct observation of lasing from transverse electromagnetic(TEM)modes with a long coherence time-9.5ps in coupled CsPbBr_(3) quantum dots,which dispense with an external cavity resonator and show how the wavelength of the modes can be controlled via two independent *** the pump power allowed us tofine-tune the TEM mode structure to the emission wavelength,thus providing a degree of control over the properties of the lasing *** temperature-tuning provided an additional degree of control over the wavelength of the lasing peak,importantly,maintained a constant full width at half maximum(FWHM)over the entire tuning range without mode-hopping.

关键词： perovskite quantum dots coherent lasing transverse electromagnetic mode stimulated emission

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A Journey Through TTF-and ExTTF-porphyrins

A Journey Through TTF-and ExTTF-porphyrins

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中国化学会第五届卟啉与酞菁学术研讨会

作者： atanu jana Institute for Supramolecular Chemistry and Catalysis Shanghai University

＜正＞The current progress of supramolecular chemistry gears-up by focusing on new generation "functional materials".Therefore,tremendous efforts have been devoted by the chemists to search for these smart ***-and exTTF-based molecular systems are well-known electroactive semiconducting materials for such kind of potential uses,due to their excellent electronic properties.

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Enhanced photoluminescence quantum yield of MAPbBr3 nanocrystals by passivation using graphene

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Nano Research 2020年第4期13卷 932-938页

作者： Youngsin Park atanu jana Chang Woo Myung Taeseung Yoon Geungsik Lee Claudius C.Kocher Guanhua Ying Vitaly Osokin Robert A.Taylor Kwang S.Kim School of Natural Science Ulsart National Institute of Science and TechnologhUlsan 44919Republic of Korea 2 Clarendon LaboratoryDepartment of PhysicsUniversity of OxfordParks RoadOxford0X13PUUK

Diminishing surface defect states in perovskite nancx^rystals is a highly challenging subject for enhancing optoelectronic device *** synthesized organic/inorganic lead-halide perovskite MAPbBr3(MA=methylammonium)clusters comprising nanocrystals with diameters ranging between 20 and 30 nm and characterized an enhanced photoluminescence(PL)quantum yield(as much as^7 times)by encapsulating the MAPbBr3 with graphene(Gr).The optical properties of MAPbBr3 and Gr/MAPbBr3 were investigated by temperature-dependent micro-PL and time-resolved PL *** functional theory calculations show that the surface defect states in MAPbBr3 are removed and the optical band gap is reduced by a 0.15 eV by encapsulation with graphene due to partial restoration of lattice distortions.

关键词： perovskite nanocluster photoluminescence surface passivation graphene density functional theory calculations

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Cobalt Incorporated Pyramidal Shaped α-Fe₂O₃ Nanoparticles from Poly-vinyl Alcohol Based Precursor

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Advances in Nanoparticles 2016年第1期5卷 9-17页

作者： atanu Naskar Susanta Bera Awadesh Kumar Mallik Sunirmal jana Sol-Gel Division CSIR-Central Glass and Ceramic Research Institute (CSIR-CGCRI) P.O. Jadavpur University Kolkata India Bioceramic and Coating Division CSIR-Central Glass and Ceramic Research Institute (CSIR-CGCRI) P.O. Jadavpur University Kolkata India

Precursor foam based Co incorporated α-Fe2O3 (AFC) was successfully synthesized at 600℃ calcination temperature by simple solution method using PVA. The formation of α-Fe2O3 nanoparticles was confirmed by X-ray diffraction measurement and reduction in crystallite size was found after cobalt incorporation. Field emission scanning electron microscopy revealed the existence of pyramidal shaped iron oxide in AFC. FTIR and Raman spectra also confirmed the presence of α-Fe2O3. Photocatalytic activity study showed that the cobalt incorporated α-Fe2O3 was better photocatalyst than pure α-Fe2O3. The cobalt incorporated iron oxide nanoparticles could be used for drug delivery application and this simple preparation method could be adopted for the synthesis of other transition metal oxides.

关键词： Sol-Gel Based Foam α-Fe2O3 Nanoparticles Polyvinyl Alcohol Catalytic Activity

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