Molten-salt synthesis and upconversion of hexagonal NaYF4:Er3+:Yb3+ micro-/nano-crystals

Autor: Xinyang Huang, Quanmao Yu, Guanghui Hu, Qiuju Xu, Xiaoxia Li
Rok vydání: 2014
Předmět:
Zdroj: Journal of Alloys and Compounds. 616:652-661
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2014.07.067
Popis: The NH 4 NO 3 molten solution system was developed to synthesize Er 3+ /Yb 3+ -doped hexagonal NaYF 4 micro-/nano-crystals with different sizes and morphologies. The influences of the reaction temperature, the reaction time, the usage amounts of reaction materials and flux NH 4 NO 3 on the structure and morphology were studied and discussed in detail. The effect of the sizes and morphologies on the upconversion properties was also investigated detailedly. The rod-like particles exhibit much stronger UC emission than for those with other shapes. The abnormal characteristics of the strong UC emission for the phosphors with the length of 80–100 nm and the diameter of ca. 50 nm was also observed. This work demonstrates a rational approach to synthesis high-quality fluorides and other types of materials in NH 4 NO 3 molten solution system, as well as a possibility to meet the increasing commercial demand.
Databáze: OpenAIRE