Aspect-Ratio Controlled Synthesis and Tunable Luminescence of YF3:Yb3+/Er3+ Upconversion Nanocrystals

G. Murali, R. K. Mishra, Jae Myeong Lee, Young Cheol Chae, Jongwoo Kim, Yung Doug Suh, Dong-Kwon Lim, Seung Hee Lee

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We report a facile synthetic method for high-aspect-ratio YF3:Yb3+/Er3+ nanocrystals by controlling the composition of the precursor and salts to manipulate the structures of YF3:Yb3+/Er3+ nanocrystals. A controlled aspect ratio is attained by tuning the molar ratio of NH4 +/RE3+ (NH4 + is the counterion released from the fluoride precursor (NH4F) and RE3+ indicates the total amount of Y, Yb, and Er) and the presence of specific inorganic salts. A low molar ratio of NH4 +/RE3+ induced the production of high-aspect-ratio YF3:Yb3+/Er3+ nanocrystals, while a high molar ratio of NH4 +/RE3+ induced the formation of irregular nanoplates. The selection of the inorganic salt as an additive is critical in controlling the aspect ratio and crystallinity of YF3:Yb3+/Er3+ nanocrystals. The cation showed limited control over the aspect ratio, but the anions, Cl- and Br-, induced the production of the highest aspect ratio for YF3:Yb3+/Er3+ nanocrystals. We found that the aspect ratio affected the luminescence properties of YF3:Yb3+/Er3+ nanocrystals. The green emission from nanorod structures changed to orange when the morphology is transformed to nanoplates.

Original languageEnglish
Pages (from-to)3055-3061
Number of pages7
JournalCrystal Growth and Design
Volume17
Issue number6
DOIs
Publication statusPublished - 2017 Jun 7

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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