TY - JOUR
T1 - Aspect-Ratio Controlled Synthesis and Tunable Luminescence of YF3:Yb3+/Er3+ Upconversion Nanocrystals
AU - Murali, G.
AU - Mishra, R. K.
AU - Lee, Jae Myeong
AU - Chae, Young Cheol
AU - Kim, Jongwoo
AU - Suh, Yung Doug
AU - Lim, Dong-Kwon
AU - Lee, Seung Hee
PY - 2017/6/7
Y1 - 2017/6/7
N2 - 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.
AB - 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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U2 - 10.1021/acs.cgd.6b01803
DO - 10.1021/acs.cgd.6b01803
M3 - Article
AN - SCOPUS:85020255089
VL - 17
SP - 3055
EP - 3061
JO - Crystal Growth and Design
JF - Crystal Growth and Design
SN - 1528-7483
IS - 6
ER -