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Your search keyword '"Hosuk Kang"' showing total 8 results
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8 results on '"Hosuk Kang"'

2. Designing Stable Deep‐Blue Thermally Activated Delayed Fluorescence Emitters through Controlling the Intrinsic Stability of Triplet Excitons (Advanced Optical Materials 12/2022)

Author

Hosuk Kang, Soo‐Ghang Ihn, Inkoo Kim, Yeon Sook Chung, Soon Ok Jeon, Myungsun Sim, Joonghyuk Kim, Hasup Lee, Youngmok Son, Won‐Joon Son, Inkook Jang, Dae Sin Kim, Hyeonho Choi, and Jin Pyo Hong

Subjects
Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
Published
2022
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5. Cohosts with efficient host-to-emitter energy transfer for stable blue phosphorescent organic light-emitting diodes.

Author

Soo-Ghang Ihn, Eun Suk Kwon, Yongsik Jung, Jong Soo Kim, Sungho Nam, Joonghyuk Kim, Sangmo Kim, Soon Ok Jeon, Yeon Sook Chung, Sangho Park, Dal Ho Huh, Hyun Jung Kim, Hosuk Kang, Namheon Lee, B. Hye Jin Baea, and Hyeonho Choi

Abstract

We present a high-performance blue phosphorescent organic light-emitting diode exhibiting a low operating voltage (4.1 V), high external quantum efficiency (23.4%, at 500 cd m-2) with a low efficiency roll-off (4.7%), and a long operation lifetime (time at which the luminance reaches 95% of its initial value, LT95 = 232 h). These are mainly attributed to a well-developed exciplex-forming cohost composed of judiciously selected component hosts. The cohost provides low injection barriers and stable transport for both positive and negative charges, excellent charge balance, and finely tuned exciplex energy for efficient host-to-emitter energy transfer. [ABSTRACT FROM AUTHOR]

Published
2021
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6. Anti-Galvanic Reduction of Silver Ion on Gold and Its Role in Anisotropic Growth of Gold Nanomaterials

Author

Bong-Geun Kim, Hyon Bin Na, Hosuk Kang, and Seongpil Hwang

Subjects
Chemistry, Inorganic chemistry, Overpotential, Electrochemistry, Ascorbic acid, Underpotential deposition, Silver nanoparticle, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Nanomaterials, Metal, General Energy, visual_art, Monolayer, visual_art.visual_art_medium, Physical and Theoretical Chemistry
Abstract

The role of silver ions in the seed-mediated growth of gold nanostructures has been investigated. Silver submonolayer or monolayer on specific facet of gold is assumed in previously suggested mechanism owing to underpotential deposition (UPD) of silver by ascorbic acid having weak reducing power. Silver overpotential deposition by ascorbic acid, however, is confirmed by electrochemical stripping voltammetry, whereas submonolayer of silver on gold is spontaneously formed by anti-galvanic reduction in the absence of ascorbic acid. In the presence of cetyltrimethylammonium bromide (CTAB), silver overpotential deposition by ascorbic acid does not occur, but submonolayer of silver is formed on gold surface. Adsorption of silver and CTAB on gold dramatically hindered the electron transfer by the oxidation of ascorbic acid on gold, which reduces gold ions to metallic gold in seed-mediated growth. These results provide the evidence to the in-depth observation of mechanism in seed-mediated growth where the blockin...

Published
2015
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