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1. H-Mediated Magnetic Interactions between Layers in a 2D Mn II -Dicyanamide Polymer: Neutron Diffraction, DFT, and Quantum Monte Carlo Calculations: H-Mediated Magnetic Interactions between Layers in a 2D Mn II -Dicyanamide Polymer: Neutron Diffraction, DFT, and Quantum Monte Carlo Calculations

   https://doi.org/10.1002/ejic.201700971  

   Gillon, Béatrice ; Hammerschmied, Albert ; Gukasov, Arsen ; Cousson, Alain ; Cauchy, Thomas ; Ruiz, Eliseo ; Schlueter, John A. ; Manson, Jamie L. ( January 2018 , European Journal of Inorganic Chemistry)
2. Optical properties of undoped, Eu 3+ doped and Li + co-doped Y 2 Hf 2 O 7 nanoparticles and polymer nanocomposite films

   https://doi.org/10.1039/c9qi01181a  

   Gupta, Santosh K. ; Zuniga, Jose P. ; Abdou, Maya ; Ghosh, P. S. ; Mao, Yuanbing ( January 2020 , Inorganic Chemistry Frontiers)

   Desirable phosphors for lighting, scintillation and composite films must have good light absorption properties, high concentration quenching, high quantum efficiency, a narrow color emission, and so forth. In this work, we first show that undoped yttrium hafnate Y 2 Hf 2 O 7 (YHO) nanoparticles (NPs) display dual blue and red bands after excitation using 330 nm light. Based on density functional theory (DFT) calculations, these two emission bands are correlated with the defect states arising in the band-gap region of YHO owing to the presence of neutral and charged oxygen defects. Once doped with Eu 3+ ions (YHOE), the YHO NPs show a bright red emission, a long excited state lifetime and stable color coordinates upon near-UV and X-ray excitation. Concentration quenching is active when Eu 3+ doping reaches 10 mol% with a critical distance of ∼4.43 Å. This phenomenon indicates a high Eu 3+ solubility within the YHO host and the absence of Eu 3+ clusters. More importantly, the optical performance of the YHOE NPs has been further improved by lithium co-doping. The origin of the emission, structural stability, and role of Li + -co-doping are explored both experimentally and theoretically. DFT calculation results demonstrate that Li + -co-doping increases the covalent character of the Eu 3+ –O 2− bonding in the EuO 8 polyhedra. Furthermore, the YHOE NPs have been dispersed into polyvinyl alcohol (PVA) to make transparent nanocomposite films, which show strong red emission under excitation at 270 and 393 nm. Overall, we demonstrate that the YHO NPs with Eu 3+ and (Eu 3+ /Li + ) doping have a high emission intensity and quantum efficiency under UV and X-ray excitation, which makes them suitable for use as phosphors, scintillators and transparent films for lighting, imaging and detection applications. 

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3. Efficient White Polymer Light‐Emitting Diode (WPLED) Based on Single‐Component Eu 3+ –Tb 3+ ‐Containing Metallopolymer

   https://doi.org/10.1002/adom.201900776  

   Fu, Guorui ; Liu, Lin ; Li, Wentao ; He, Yani ; Miao, Tiezheng ; Lü, Xingqiang ; He, Hongshan ( August 2019 , Advanced Optical Materials)

   Despite the excellent physical properties of single‐component Eu³⁺–Tb³⁺‐containing metallopolymers, the development of their flexible white polymer light‐emitting diodes (WPLEDs) for portable full‐color flat displays remains a formidable challenge. Herein, the WPLEDs from a metallopolymerPoly(NVK‐co‐2‐co‐7)are reported, in which [Eu(DBM)₃(4‐vp‐PBI)] (2) and [Tb(tba‐PMP)₃(4‐vp‐PBI)] (7) with different localized circumstances are grafted into poly(N‐vinyl‐carbarzole) (PVK). In this design, both Dexter and Förster energy transfers occur, which endow a photoluminescent quantum yield up to 22.3% of the straightforward high‐quality white‐lights. Contributing from the stepwise alignment of frontier molecular orbitals ofPoly(NVK‐co‐2‐co‐7)as the emitting layer in combination with CBP‐ and BCP‐assisted carrier‐transports, a reliable WPLED with the record‐renewed electroluminescent performance (L^Max= 388.0 cd m⁻², η_c^Max= 31.1 cd A⁻¹, η_p^Max= 15.0 lm W⁻¹, η_EQE^Max= 18.1%, and weak efficiency‐roll‐off) among previous organo‐Ln³⁺‐based white organic light‐emitting diodes/WPLEDs is achieved. This finding renders a single‐component Eu³⁺–Tb³⁺‐containing metallopolymers a potential new platform to cost‐effective flexible WPLEDs for practical applications.

    

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4. Enhanced Surface Interactions Enable Fast Li + Conduction in Oxide/Polymer Composite Electrolyte

   https://doi.org/10.1002/ange.201914478  

   Wu, Nan ; Chien, Po‐Hsiu ; Qian, Yumin ; Li, Yutao ; Xu, Henghui ; Grundish, Nicholas S. ; Xu, Biyi ; Jin, Haibo ; Hu, Yan‐Yan ; Yu, Guihua ; et al ( March 2020 , Angewandte Chemie)
5. High-Loading Composition-Tolerant Co–Mn Spinel Oxides with Performance beyond 1 W/cm 2 in Alkaline Polymer Electrolyte Fuel Cells

   https://doi.org/10.1021/acsenergylett.9b00597  

   Yang, Yao ; Peng, Hanqing ; Xiong, Yin ; Li, Qihao ; Lu, Juntao ; Xiao, Li ; DiSalvo, Francis J. ; Zhuang, Lin ; Abruña, Héctor D. ( May 2019 , ACS Energy Letters)