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 journalArticlepeer-review

22 Citations (Scopus)


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
Issue number6
Publication statusPublished - 2017 Jun 7

Bibliographical note

Funding Information:
This research was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2016R1A2B3013825) KU-KIST school project. This research was also supported by Research Base Construction Fund Support Program funded by Chonbuk National University in 2017.

Publisher Copyright:
© 2017 American Chemical Society.

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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