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      저자 : Parobek David (검색결과 3 건)
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      • Direct Hot-Injection Synthesis of Mn-Doped CsPbBr<sub>3</sub> Nanocrystals

        Parobek, David,Dong, Yitong,Qiao, Tian,Son, Dong Hee American Chemical Society 2018 Chemistry of materials Vol.30 No.9

        <P>We report the direct hot-injection synthesis of Mn-doped cesium lead bromide (CsPbBr<SUB>3</SUB>) perovskite nanocrystals. In contrast to Mn-doped CsPbCl<SUB>3</SUB> nanocrystals, where doping of Mn under typical hot-injection synthesis condition has been relatively straightforward, extending the same approach to CsPbBr<SUB>3</SUB> has been very difficult. Here, we achieved the synthesis of Mn-doped CsPbBr<SUB>3</SUB> nanocrystals via the formation of an intermediate structure (L<SUB>2</SUB>[Pb<SUB>1-<I>x</I></SUB>Mn<SUB><I>x</I></SUB>]Br<SUB>4</SUB>, L = ligand) before the hot-injection of the Cs precursor, which contains the same Mn-Br coordination present in Mn-doped CsPbBr<SUB>3</SUB> nanocrystals. A strong correlation was observed between the Mn luminescence intensities of L<SUB>2</SUB>[Pb<SUB>1-<I>x</I></SUB>Mn<SUB><I>x</I></SUB>]Br<SUB>4</SUB> and Mn-doped CsPbBr<SUB>3</SUB> nanocrystals, suggesting the possible role of L<SUB>2</SUB>[Pb<SUB>1-<I>x</I></SUB>Mn<SUB><I>x</I></SUB>]Br<SUB>4</SUB> as the structural precursor to Mn-doped CsPbBr<SUB>3</SUB> nanocrystals. The successful Mn doping in CsPbBr<SUB>3</SUB> nanocrystal host, which has significantly better optical characteristics than CsPbCl<SUB>3</SUB> nanocrystals, will expand the range of useful properties of Mn-doped cesium lead halide perovskite nanocrystals resulting from the coupling of exciton and Mn.</P> [FIG OMISSION]</BR>

      • SCOPUSKCI등재

        Controlling Quantum Confinement and Magnetic Doping of Cesium Lead Halide Perovskite Nanocrystals

        Dong, Yitong,Parobek, David,Son, Dong Hee The Korean Ceramic Society 2018 한국세라믹학회지 Vol.55 No.6

        Cesium lead halide ($CsPbX_3$) nanocrystals have emerged as a new family of semiconductor nanomaterials that can outperform existing semiconductor nanocrystals owing to their superb optical and charge transport properties. Although these materials are expected to have many superior properties, control of the quantum confinement and isoelectronic magnetic doping, which can greatly enhance their optical, electronic, and magnetic properties, has faced significant challenges. These obstacles have hindered full utilization of the benefits that can be obtained by using $CsPbX_3$ nanocrystals exhibiting strong quantum confinement or coupling between exciton and magnetic dopants, which have been extensively explored in many other semiconductor quantum dots. Here, we review progress made during the past several years in tackling the issues of introducing controllable quantum confinement and doping of $Mn^{2+}$ ions as the prototypical magnetic dopant in colloidal $CsPbX_3$ nanocrystals.

      • SCISCIESCOPUS

        Precise Control of Quantum Confinement in Cesium Lead Halide Perovskite Quantum Dots via Thermodynamic Equilibrium

        Dong, Yitong,Qiao, Tian,Kim, Doyun,Parobek, David,Rossi, Daniel,Son, Dong Hee American Chemical Society 2018 NANO LETTERS Vol.18 No.6

        <P>Cesium lead halide (CsPbX<SUB>3</SUB>) nanocrystals have emerged as a new family of materials that can outperform the existing semiconductor nanocrystals due to their superb optical and charge-transport properties. However, the lack of a robust method for producing quantum dots with controlled size and high ensemble uniformity has been one of the major obstacles in exploring the useful properties of excitons in zero-dimensional nanostructures of CsPbX<SUB>3</SUB>. Here, we report a new synthesis approach that enables the precise control of the size based on the equilibrium rather than kinetics, producing CsPbX<SUB>3</SUB> quantum dots nearly free of heterogeneous broadening in their exciton luminescence. The high level of size control and ensemble uniformity achieved here will open the door to harnessing the benefits of excitons in CsPbX<SUB>3</SUB> quantum dots for photonic and energy-harvesting applications.</P> [FIG OMISSION]</BR>

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