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

doi:10.1021/acs.cgd.6b01803

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 journal › Article

16 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 language	English
Pages (from-to)	3055-3061
Number of pages	7
Journal	Crystal Growth and Design
Volume	17
Issue number	6
DOIs	https://doi.org/10.1021/acs.cgd.6b01803
Publication status	Published - 2017 Jun 7

ASJC Scopus subject areas

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

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Murali, G., Mishra, R. K., Lee, J. M., Chae, Y. C., Kim, J., Suh, Y. D., Lim, D-K., & Lee, S. H. (2017). Aspect-Ratio Controlled Synthesis and Tunable Luminescence of YF₃:Yb³⁺/Er³⁺ Upconversion Nanocrystals. Crystal Growth and Design, 17(6), 3055-3061. https://doi.org/10.1021/acs.cgd.6b01803

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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.",

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