Search Results - "Choi, Yong Gyu"

Nanosecond switching in GeSe phase change memory films by atomic force microscopy by Bosse, James L., Grishin, Ilya, Gyu Choi, Yong, Cheong, Byung-ki, Lee, Suyoun, Kolosov, Oleg V., Huey, Bryan D.

“…Nanosecond scale threshold switching is investigated with conducting atomic force microscopy (AFM) for an amorphous GeSe film. Switched bits exhibit 2–3 orders…”
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The past, present and future of photonic glasses: A review in homage to the United Nations International Year of glass 2022 by Blanc, Wilfried, Gyu Choi, Yong, Zhang, Xianghua, Nalin, Marcelo, Richardson, Kathleen A., Righini, Giancarlo C., Ferrari, Maurizio, Jha, Animesh, Massera, Jonathan, Jiang, Shibin, Ballato, John, Petit, Laeticia

“…Since the invention and further development of lasers in the 1960s, photonics has grown into a field that permeates virtually every aspect of modern life. As…”
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Wet process-prepared thick films of WO3 for NO2 sensing by Choi, Yong-Gyu, Sakai, Go, Shimanoe, Kengo, Miura, Norio, Yamazoe, Noboru

“…Preparation of an aqueous sol of WO3·2H2O starting from Na2WO4 through an ion-exchange method, coupled with post-treatments (ultrasonic and/or centrifugal),…”
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Preparation of aqueous sols of tungsten oxide dihydrate from sodium tungstate by an ion-exchange method by Choi, Yong-Gyu, Sakai, Go, Shimanoe, Kengo, Miura, Norio, Yamazoe, Noboru

“…Aqueous sols of tungsten oxide dihydrate (WO 3·2H 2O) were prepared from Na 2WO 4 by an ion-exchange method. An aqueous solution of Na 2WO 4 was let to flow…”
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Adjustment of refractive index of Ge-Ga-Se glass via Te addition for infrared-imaging applications by Kim, Hyun, Yoon, Il Jung, Choi, Yong Gyu

“…After assessing compositional dependence of thermal and optical properties of Ge-Ga-Se glasses, we introduce Te, via replacing Se, into Ge25Ga5Se70 and…”
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Compositional screening of chalcogenide glass for use as molded lens: an exemplary case of ternary Ge-Sb-Se glass by Lee, Jun Ho, Kim, Hyun, Choi, Yong Gyu

“…Thermal imaging in the long-wavelength infrared (8‒12 μm) range is blooming in diverse civilian sectors. In order to meet requirements specific to these new…”
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The effect of doping Sb on the electronic structure and the device characteristics of Ovonic Threshold Switches based on Ge-Se by Shin, Sang-Yeol, Choi, J. M., Seo, Juhee, Ahn, Hyung-Woo, Choi, Yong Gyu, Cheong, Byung-ki, Lee, Suyoun

“…The Ovonic Threshold Switch (OTS) based on an amorphous chalcogenide material has attracted much interest as a promising candidate for a high-performance…”
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Enhancing fluorescence emission properties of Dy3+ doped in chalcogenide glass via very small compositional modifications by Choi, Yong Gyu

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Preparation of size and habit-controlled nano crystallites of tungsten oxide by Choi, Yong-Gyu, Sakai, Go, Shimanoe, Kengo, Teraoka, Yasutake, Miura, Norio, Yamazoe, Noboru

“…An aqueous sol dispersing nano crystallites of WO 3·2H 2O was subjected to a centrifugal treatment for 1 or 10 h, to obtain two kinds of WO 3·2H 2O gels with…”
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Reshaping transmission spectrum of long-wavelength infrared-transmitting chalcogenide glass via doping of rare earth and/or transition metal ions by Kim, Hyun, Lee, Woo Hyung, Lee, Jun Ho, Kwon, Do Kyun, Song, Yo Seung, Choi, Yong Gyu

“…A group of chalcogenide glass is particularly functional as lens, filter and window operating in the long-wavelength infrared range from 8 μm to 12 μm. The…”
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Thermal properties of ternary Ge–Sb–Se chalcogenide glass for use in molded lens applications by Lee, Jun Ho, Lee, Woo Hyung, Park, Jong Kwan, Yi, Jeong Han, Shin, Sang Yeol, Park, Bong Je, So, Byoungjin, Heo, Jong, Choi, Ju Hyeon, Kim, Hye Jeong, Choi, Yong Gyu

“…As for the molded lens applications of ternary Ge-Sb-Se glass, Ge-rich compositions are normally preferable since thermal and mechanical properties are better…”
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Spatial distribution of rare-earth ions in Se-based chalcogenide glasses with or without Ga by Choi, Yong Gyu

“…Measured lifetime of the ( 3F 3, 3F 4) level of Pr 3+ ions doped in representative Se-based chalcogenide Ge–Sb–Se glasses peaked at the mean coordination…”
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Rare earth doped silicate-oxyfluoride glass ceramics incorporating LaF3 nano-crystals for UV-LED color conversion by Bae, Suk-Rok, Choi, Yong Gyu, Im, Won Bin, Lee, Ki Seok, Chung, Woon Jin

“…► We synthesized various rare earth ion doped oxyfluoride glasses. ► LaF3 nano-crystals were formed and improved visible emission of rare earth ions. ► UV-LED…”
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Compositional effect on structural and spectroscopic properties of P2O5-SnO-MnO ternary glass system by WOON JIN CHUNG, CHOI, Jeon, YONG GYU CHOI

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Compositional dependence of Se2− color center formation in silicate glasses by Choi, Jeon, Park, Bong Je, Choi, Yong Gyu, Heo, Jong, Chung, Woon Jin

“…We experimentally verified, within silicate glasses, the formation of Se2− color centers that are responsible for a broad visible emission under optical…”
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Ge and Ga K-edge EXAFS analyses on the structure of Ge–Ga–S–CsBr glasses by Song, Jay Hyok, Choi, Yong Gyu, Heo, Jong

“…The local structure of Ge and Ga ions in (1−x)(Ge0.25Ga0.10S0.65)–xCsBr glasses (x=0.00,0.05,0.10 and 0.12) were investigated using extended X-ray absorption…”
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Thermal expansion behavior of Ge‐Sb‐Se glasses in a compositional range for molded infrared lens applications by Lee, Woo Hyung, Yi, Jeong Han, Lee, Jun Ho, Park, Bong Je, Choi, Ju Hyeon, Kim, Hye Jeong, Choi, Yong Gyu

“…The thermal expansion coefficient (TEC) of Ge‐Sb‐Se glass, within a compositional range suitable for molded lenses capable of transmitting long‐wavelength…”
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1.4 μm emission properties and local environments of Tm3+ ions in tellurite glass modified with MoO3 by WOON JIN CHUNG, YONG GYU CHOI

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Local-field correction for intra-4f-configurational transitions of rare earth ions embedded in amorphous chalcogenide solids by Choi, Yong Gyu, Song, Jay Hyok

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Local structural environment and intra-4f transition of rare-earth ion in chalcogenide glass: Comparison between Dy-doped Ge-As-S and Ge-Ga-S glasses by Choi, Yong Gyu, Song, Jay Hyok

“…We have employed Dy L(3)-edge extended X-ray absorption fine structure measurements to investigate the local structures of Dy doped in Ge-As-S and Ge-Ga-S…”
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