Confinement and antenna effect for ultrasmall Y 2 O 3 :Eu 3+ nanocrystals supported by MOF with enhanced near-UV light a
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Confinement and antenna effect for ultrasmall Y2O3:Eu3+ nanocrystals supported by MOF with enhanced near-UV light absorption thereby enhanced luminescence and excellently multifunctional applications Hongyi Xu1, Wenjing Yu1, Kai Pan1, Guofeng Wang1 (), and Peifen Zhu2 () 1
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China 2 Department of Physics and Engineering Physics, The University of Tulsa, Tulsa, OK 74104, USA © Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Received: 9 August 2020 / Revised: 7 September 2020 / Accepted: 8 September 2020
ABSTRACT A novel host-guest luminous system with enhanced near-UV light absorption thereby enhanced luminescence are designed based on the synergism of quantum confinement, spatial confinement, and antenna effect, where ultrasmall Y2O3:Eu3+ nanocrystals are fixed inside MOF (Eu/Y-BTC) as supporting structure. The Eu/Y-BTC not only limits the size and leads to lattice distortion of Y2O3:Eu3+ nanocrystals and controls the distance between nanocrystals, but also promotes the light absorption and emission. The significantly red-shifted and broadened charge transfer band of Y2O3:Eu3+/(Eu/Y-BTC) leads to the excellent applications of Y2O3:Eu3+ in white light-emitting diodes (LEDs). Our results show that white light with superior color quality (CRI>90) and extremely high luminous efficacy (an LER of 335 lm/W) could be achieved using Y2O3:Eu3+/(Eu/Y-BTC) as red phosphor. The Y2O3:Eu3+/ (Eu/Y-BTC) also improves the photoelectric performance of dye-sensitized solar cells (DSSCs), not only because Y2O3:Eu3+/(Eu/Y-BTC) has a large specific surface area and the adsorption amount of the dye is increased, but also because the valence band position of Y2O3:Eu3+/(Eu/Y-BTC) is 2.41 eV, which can provide an additional energy level between the TiO2 and dye, promoting electron transfer. For these advantageous features, the multifunctional Y2O3:Eu3+/(Eu/Y-BTC) composite product will open new avenues in white LEDs and DSSCs.
KEYWORDS confinement effect, antenna effect, enhanced luminescence, ultrasmall Y2O3:Eu3+ nanocrystals, MOFs, multifunctional applications
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Introduction
Due to the unique electronic structure, rich energy levels, and characteristic spectral signature of rare-earth ions, the multifunctional rare-earth luminescent materials have the advantages of wide emission spectral range, narrow line-width emission, and stable physical and chemical characteristics, which have made them promising materials to achieve highly efficient optoelectronic devices such as flat displays, solar cell, and new light sources [1–9]. Particularly, rare-earth luminescent materials have very important practical value in advancing solid-state lighting technology. To fully realize the potentials of rare-earth luminescence materials in modern optoelectronic devices, further improving the efficiency of these materials is essential. The cross-secti
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