Date

Place

Room H (Room Hall 1, 1F)
P1. Poster Session I
August 20, 2015 (Thursday)
14:00 ~ 15:30

[P1-10]
14:00 ~ 15:30
Title:Synthesis of YF3:Yb3+/Er3+ Nanosheets and Their Upconversion Luminescence
G.Murali, Tae Hyung Kim, Jee Hun Kim, Jae Myeong Lee, Sung Cheol Noh, Eun Jeong Shin (Chonbuk Nat'l Univ., Korea), Dong Kwon Lim (Korea Univ., Korea), and Seung Hee Lee (Chonbuk Nat'l Univ., Korea)
Abstract: Recently, lanthanide doped upconversion nanomaterials with bright upconversion fluorescence emission have attracted a considerable interest. Most of the upconversion nanomaterials that have been synthesized so far are lanthanide doped fluoride materials, since fluoride materials have low phonon energies which minimize non-radiative losses to enable intense upconversion emissions. Among all fluoride host materials, YF3??is one of the important fluorides with potential applications in ?solid-state laser, phosphors, ionic conductors, and scintillators.In the present investigation, we have synthesized YF3:Yb3+/Er3+?nanosheets. Nanosheets are appeared to be tapered at the middle since the width of the nanosheet is decreasing from both ends to the middle. Length, width and thickness of the nanosheets are 160-240, 70-140 and 10-15 nm, respectively. Fluorescence emission spectrum of YF3:Yb3+/Er3+?nanosheets was measured under an excitation of 980 nm laser. The emission spectrum shows the characteristic green (546 nm) and red (658 nm) upconverted light with red being more intense than the green. The green and red emission bands can be attributed to?4S3/2��4I5/2?and?4F9/2��?4I5/2?transitions of Er3+?ion, respectively. The observed high photoluminescence intensity and peculiar morphology of YF3:Yb3+/Er3+?nanocrystals are expected to lead to the potential application in biomedical imaging and display applications
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