Crystalline phase and morphology controlling to enhance the up-conversion emission from NaYF4:Yb, Er nanocrystals. (1st June 2017)

• Record Type: Journal Article
• Authors: Wu, Yangqing; Ji, Yang; Xu, Jun; Liu, Jingjing; Lin, Zewen; Zhao, Yaolong; Sun, Ying; Xu, Ling; Chen, Kunji
• Is Part Of: Acta materialia. Volume 131(2017)
• Page Start: 373
• Page End: 379
• Publication Date: 2017-06-01
• Subjects: Up-conversion (UC) -- NaYF4 nanocrystals -- Gd3+ ions; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2017.04.013
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: NaYF4 :Yb, Er nanocrystals with different structures and sizes have been synthesized via a hydrothermal method. Structures and sizes of the NaYF4 :Yb, Er nanocrystals are carefully investigated by changing the Gd 3+ ion concentrations and reaction temperatures. It is found that the change of Gd 3+ doping concentration and reaction temperature not only induces the phase transition but also causes the size difference. The introduction of Gd 3+ ions can promote the phase change from cubic to hexagonal structures, which exhibit the different morphologies (nanoparticle vs nanorods). However, by increasing the reaction temperature slightly, the hexagonal structures can be formed with very low or even without any Gd 3+ ions. It is shown that the enhanced up-conversion emission can be achieved by well controlling the Gd 3+ ion concentrations at the certain reaction temperature to get the pure nanorods structures with suitable sizes. Graphical abstract: Image 1