Tunable Thickness and Photoluminescence of Bipyramidal Hexagonal β-NaYF4 Microdisks

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• 作者：Jianle Zhuang ; Jing Wang ; Xianfeng Yang ; Ian D. Williams ; Wei Zhang ; Qinyuan Zhang ; Zhouming Feng ; Zhongmin Yang ; Chaolun Liang ; Mingmei Wu ; Qiang Su
• 刊名：Chemistry of Materials
• 出版年：2009
• 出版时间：January 13, 2009
• 年：2009
• 卷：21
• 期：1
• 页码：160-168
• 全文大小：356K
• 年卷期：v.21,no.1(January 13, 2009)
• ISSN：1520-5002

文摘

Hexagonal β-NaYF₄ was synthesized as capped bipyramidal microdisks solvothermally from yttria (Y₂O₃), sodium fluoride and ammonium hydrogen fluoride. The microdisks are bound by up to eighteen faces; six {203} facets on both the top and bottom of the disk and six radial {100} facets around its central band. The overall morphology and particle size can be modified through change of temperature or alcoholic solvent, both of which affect the development of the {100} faces. The photoluminescence properties of doped microdisks, such as down-conversion in the case of β-NaYF₄:Eu³⁺ or up-conversion for β-NaYF₄:Yb³⁺/Er³⁺, were investigated in detail. The lifetime and emission of the Eu³⁺ and Er³⁺ ions appear related to the morphology of the host crystals. This system provides an excellent example in the tuning and optimization of the optical properties of a material through morphological control via facile change of synthetic conditions.