Doping-Site Dependence of Upconversion Emission of Ho3+ Ion in BaHfO3
Hyeontae Lim, Soyeong Jang, Y. S. Lee
Department of Physics, Soongsil University, Seoul 06978, Korea

We investigated the doping-site dependence of upconversion (UC) emission characteristics of Ho3+ and Yb3+ ions co-doped BaHfO3 (BHO). The Ho3+ and Yb3+ ions could be doped in Ba-site (A-site) and Hf-site (B-site) of BHO. Under 980-nm near-infrared excitation, we detected sizable green (550 nm) and red (660 and 760 nm) UC emissions from Ho3+ ions assisted by Yb3+ ions. More interestingly, the UC emission intensities of B-site doped samples were greater than those of A-site doped samples. We suggested that the asymmetry ratio in the local structure around Ho3+ ions should be an important factor for the UC emission.

J. Korean Phys. Soc. 2020; 76: 155-161

Scanning Tunneling Microscope Study on C2H2 Adsorption on a Ge(100) Surface

Geunseop Lee1, Kyeongseong Chae2
1Department of Physics, Inha University, Incheon 22212, Korea
2Department of Physics, Chonnam National University, Gwangju 61186, Korea

Figs. A. Schematic diagrams of the adsorption configurations proposed for C2H2 on Ge(001): di-$\sigma$-bonded in (a) on-top, (b) end-bridge, and (c) paired end-bridge configurations, and tetra-$\sigma$-bonded in (d) parallel-bridge and (e) rotated-bridge configurations. H atoms in a C2H2 molecule are not shown for simplicity. B. Empty-state STM image of C2H2/Ge(001) (Vs = +0.8 V) [Inset: filled-state (Vs = -2.0 V) image taken simultaneously over the same area]. The characteristic empty-state double maximum of the one-dimer (circle) and quadruple maximum of the two-dimer (square) features indicate C2H2 adsorption in on-top and paired end-bridge configurations, respectively.

J. Korean Phys. Soc. 2019; 75: 924-928
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