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Crystal Structures, Anisotropic Growth, and Optical Properties: Controlled Synthesis of Lanthanide Orthophosphate One‐Dimensional Nanomaterials
Author(s) -
Yan Ruoxue,
Sun Xiaoming,
Wang Xun,
Peng Qing,
Li Yadong
Publication year - 2005
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200400649
Subject(s) - nanomaterials , tetragonal crystal system , materials science , monoclinic crystal system , nanotechnology , lanthanide , hydrothermal circulation , crystal growth , photoluminescence , anisotropy , nanostructure , crystal (programming language) , hydrothermal synthesis , doping , nanocrystal , phase (matter) , crystal structure , crystallography , chemical engineering , chemistry , optoelectronics , optics , ion , programming language , physics , organic chemistry , computer science , engineering
The fundamental understanding of the relationship between crystal structure and the dynamic processes of anisotropic growth on the nanoscale, and exploration of the key factors governing the evolution of physical properties in functional nanomaterials, have become two of the most urgent and challenging issues in the fabrication and exploitation of functional nanomaterials with designed properties and the development of nanoscale devices. Herein, we show how structural and kinetic factors govern the tendency for anisotropic growth of such materials under hydrothermal conditions, and how the crystal structure and morphology influence the optical properties of Ln 3+ ‐doped nanocrystals. The synthesis of phase‐pure and single‐crystalline monoclinic, hexagonal, and tetragonal one‐dimensional LnPO 4 nanostructures of different aspect ratios by means of kinetically controlled hydrothermal growth processes is demonstrated. It is shown that the tendency for anisotropic growth under hydrothermal conditions can be enhanced simply by modifying the chemical potentials of species in the reaction solution through the use of carefully selected chelating ligands. A systematic study of the photoluminescence of various Eu 3+ ‐doped lanthanide phosphates has revealed that the optical properties of these nanophosphors are strongly dependent on their crystal structures and morphologies.