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journal article·2024-10

Decoding Upconversion‐Emitting Phase in Complex Composites Through Single‐Particle‐Level Upconversion Imaging and Density Functional Theory Calculations

Yuwaraj K. Kshetri, Bina Chaudhary, Jongwoo Kim, Sang Hwan Nam, G. Murali, Jun Zhou, Shijie Wang, Yuan Ping Feng, Jinhyuk Choi, Insik In, Shuki Torii, Takashi Kamiyama, Soo Wohn Lee, Tae‐Ho Kim

Small· Volume 20· Issue 40
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Source abstract

Abstract

Abstract The crystal structure and phase stability of a host lattice plays an important role in efficient upconversion phenomena. In stable hosts, lanthanides doping should not generally change the crystal structure of the host itself. But when phase of a system drastically changes after lanthanide doping resulting in multiple phases, accurate identification of upconverting phase remains a challenge. Herein, an attempt to synthesize lanthanide‐doped NiMoO 4 by microwave hydrothermal method produced MoO 3 /Yb 2 Mo 4 O 15 /NiMoO 4 micro‐nano composite upconversion phosphor. A combined approach of density functional theory (DFT) calculations and single‐particle‐level upconversion imaging has been employed to elucidate the phase stability of different phases and upconversion properties within the composite. Through single‐particle‐level imaging under 980 nm excitation, an unprecedented resolution in visualizing individual emitting and non‐emitting regions within the composite has been achieved, thereby allowing to accurately assign the Yb 2 Mo 4 O 15 as a sole upconversion emitting phase in the composite. Result of the DFT calculation further shows that the Yb 2 Mo 4 O 15 phase is the most thermodynamically preferred over other lanthanide‐doped phases in the composite. This comprehensive understanding not only advances the knowledge of upconversion emission from composite materials but also holds promise for tailoring optical properties of materials for various applications, including bioimaging, sensing, and photonics, where controlled light emission is crucial.
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Research context

Composites

OpenAlex topics: Luminescence Properties of Advanced Materials · Radiation Detection and Scintillator Technologies · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Research Center for Green Advanced Materials Sun Moon University Chungnam 31460 Republic of Korea

Department of Energy and Chemical Engineering Sun Moon University Chungnam 31460 Republic of Korea

Department of Fusion Science and Technology Sun Moon University Chungnam 31460 Republic of Korea

Laboratory for Advanced Molecular Probing (LAMP) Korea Research Institute of Chemical Technology (KRICT) Daejeon 34114 Republic of Korea

Department of Physics Chungnam National University Daejeon 34134 Republic of Korea

Department of Polymer Science and Engineering Department of IT‐Energy Convergence (BK21 FOUR) Chemical Industry Institute Korea National University of Transportation Chungju 27469 Republic of Korea

Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis #08‐03 Singapore 138634 Singapore

Department of Physics National University of Singapore Singapore 117551 Singapore

Institute of Materials Structure Science High Energy Accelerator Research Organization J‐PARC Center KEK, 203‐1 Tokai Ibaraki 319–1106 Japan

Institute of High‐Energy Physics Chinese Academy of Sciences Beijing 100049 China

Spallation Neutron Source Science Center Dongguan 523803 China

Funding

National Research Foundation of Korea · Ministry of Science ICT and Future Planning · All Optical Network and Modern Communication Networks, Ministry of Education

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