title: Hydrothermal-assisted exfoliation of Y/Tb/Eu ternary layered rare-earth hydroxides into tens of micron-sized unilamellar nanosheets for highly oriented and color-tunable nano-phosphor films.
abstract: Efficient exfoliation of well-crystallized (Y0.96Tb x Eu0.04-x )2(OH)5NO3 · nH2O (0 ≤ x ≤ 0.04) layered rare-earth hydroxide (LRH) crystals into tens of micron-sized unilamellar nanosheets has been successfully achieved by inserting water insoluble oleate anions (C17H33COO(-)) into the interlayer of the LRH via hydrothermal anion exchange at 120°C, followed by delaminating in toluene. The intercalation of oleate anions led to extremely expanded interlayer distances (up to approximately 5.2 nm) of the LRH crystals and accordingly disordered stacking of the ab planes along the c-axis and also weakened interlayer interactions, without significantly damaging the ab plane. As a consequence, the thickness of the LRH crystals increased from approximately 1 to 10 μm, exhibiting a behavior similar to that observed from the smectite clay in water. Highly [111]-oriented and approximately 100-nm thick oxide films of (Y0.96Tb x Eu0.04-x ) 2O3 (0 ≤ x ≤ 0.04) have been obtained through spin-coating of the exfoliated colloidal nanosheets on quartz substrate, followed by annealing at 800°C. Upon UV excitation at 266 nm, the oxide transparent films exhibit bright luminescence, with the color-tunable emission from red to orange, yellow, and then green by increasing the Tb(3+) content from x = 0 to 0.04.
authors: Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials and Metallurgy, Northeastern University, No. 3-11, Wenhua Road, Shenyang, Liaoning 110819 China.
authors: Qi
authors: Q
authors: Zhu
authors: Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials and Metallurgy, Northeastern University, No. 3-11, Wenhua Road, Shenyang, Liaoning 110819 China.
authors: Zhixin
authors: Z
authors: Xu
authors: Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials and Metallurgy, Northeastern University, No. 3-11, Wenhua Road, Shenyang, Liaoning 110819 China ; Advanced Materials Processing Unit, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044 Japan.
authors: Ji-Guang
authors: JG
authors: Li
authors: Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials and Metallurgy, Northeastern University, No. 3-11, Wenhua Road, Shenyang, Liaoning 110819 China.
authors: Xiaodong
authors: X
authors: Li
authors: Institute of Materials Physics and Chemistry, School of Sciences, Northeastern University, No. 3-11, Wenhua Road, Shenyang, Liaoning 110819 China.
authors: Yang
authors: Y
authors: Qi
authors: Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials and Metallurgy, Northeastern University, No. 3-11, Wenhua Road, Shenyang, Liaoning 110819 China.
authors: Xudong
authors: X
authors: Sun
keywords: Color-tunable emission; Hydrothermal anion exchange; Layered rare-earth hydroxide; Oriented films; Ultra-large unilamellar nanosheets