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23 results on '"Suh, Minwon"'

9. High-Efficiency Polymer LEDs with Fast Response Times Fabricated via Selection of Electron-Injecting Conjugated Polyelectrolyte Backbone Structure

Author

Suh, Minwon, primary, Bailey, Jim, additional, Kim, Sung Wook, additional, Kim, Kyungmok, additional, Yun, Dong-Jin, additional, Jung, Youngsuk, additional, Hamilton, Iain, additional, Chander, Nathan, additional, Wang, Xuhua, additional, Bradley, Donal D. C., additional, Jeon, Duk Young, additional, and Kim, Ji-Seon, additional

Published
2015
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19. Macromol. Rapid Commun. 17/2009

Author

Kim, TaeYoung, primary, Suh, Minwon, additional, Kwon, Soon Jae, additional, Lee, Tae Hee, additional, Kim, Jong Eun, additional, Lee, You Jong, additional, Kim, Joo Hyung, additional, Hong, MunPyo, additional, and Suh, Kwang S., additional

Published
2009
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20. In situ ligand exchange of thiol-capped CuInS2/ZnS quantum dots at growth stage without affecting luminescent characteristics

Author

Kim, Hyunki, Suh, Minwon, Kwon, Byung-Hwa, Jang, Dong Seon, Kim, Sung Wook, and Jeon, Duk Young

Subjects
*THIOLS, *COPPER compounds, *LIGANDS (Chemistry), *QUANTUM dots, *LUMINESCENCE, *SURFACE active agents, *ALIPHATIC compounds, *TERNARY superconductors
Abstract

Abstract: An aliphatic thiol ligand of CuInS2/ZnS core/shell quantum dots is replaced with a hydroxyl-terminated thiol ligand by utilizing ‘on–off state’ of ligands during growth stage of the quantum dots. After the ligand-exchange, negligible differences were observed on both photoluminescence spectrum and luminescent quantum efficiency. The reason for the high retention of luminescent efficiency comes from no local agglomeration and no surface deterioration of QDs. It is also observed that 70% of initial ligands are exchanged by the replacing ligand, determined by FT-IR and 1H NMR. The proposed method provides the quantum dots with an excellent dispersibility in polar solvents, supported by identical luminescence decay characteristics of the QDs. [Copyright &y& Elsevier]

Published
2011
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21. In Situ Synthesis of Thiol-Capped CuInS2-ZnS Quantum Dots Embedded in Silica Powder by Sequential Ligand-Exchange and Silanization

Author

Kim, Hyunki, Seong, Ho, Kwon, Hwa, Suh, Minwon, Youngsun, Kim, Hoon, Sang, and, Cheong, and Young, Duk

Abstract

Thiol-capped CuInS2-ZnS core-shell quantum dot (QD) embedded in silica powder is synthesized by in situ approach, which contributes to facileness, high reproducibility and mass-productivity. The proposed method is distinguished in that it uses intermediate ligand-exchange step with hydroxyl-terminated ligands during growth stage, which helps the QDs to be dispersed in polar silane matrix to form micron-sized silica powder. This results in well-dispersed QDs in the silica powder with luminescence efficiency of 34%. In addition, the QDs/silica composites are applied to white-LEDs, demonstrating high quality white light with high color stability under various operating currents.

Published
2011

22. In SituSynthesis of Thiol-Capped CuInS2-ZnS Quantum Dots Embedded in Silica Powder by Sequential Ligand-Exchange and Silanization

Author

Kim, Hyunki, Jang, Ho Seong, Kwon, Byoung-Hwa, Suh, Minwon, Youngsun, Kim, Cheong, Sang Hoon, and Jeon, Duk Young

Abstract

Thiol-capped CuInS2-ZnS core-shell quantum dot (QD) embedded in silica powder is synthesized by in situapproach, which contributes to facileness, high reproducibility and mass-productivity. The proposed method is distinguished in that it uses intermediate ligand-exchange step with hydroxyl-terminated ligands during growth stage, which helps the QDs to be dispersed in polar silane matrix to form micron-sized silica powder. This results in well-dispersed QDs in the silica powder with luminescence efficiency of 34%. In addition, the QDs/silica composites are applied to white-LEDs, demonstrating high quality white light with high color stability under various operating currents.

Published
2011
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23. Characteristics of CuInS2/ZnS quantum dots and its application on LED

Author

Kim, Hyunki, Han, Ji Yeon, Kang, Dong Seok, Kim, Sung Wook, Jang, Dong Seon, Suh, Minwon, Kirakosyan, Artavazd, and Jeon, Duk Young

Subjects
*SULFIDES, *QUANTUM dots, *LIGHT emitting diodes, *SURFACE defects, *PHOTOLUMINESCENCE, *NANOSTRUCTURED materials, *POLYSTYRENE, *HYDROPHOBIC surfaces, *METALLIC composites, *SEMICONDUCTORS, *PHOSPHORS
Abstract

Abstract: In this research, CuInS2 quantum dots (QDs) have been studied as an excellent red emitting source for white LED because of its non-toxic deep red emission, and large Stokes shift properties. The CuInS2 QDs are synthesized by the one-pot method, which is a candidate for the mass-production method. In addition, formation of ZnS shells on QD surfaces has been conducted in order to reduce non-radiative recombination on its surface defects. The photoluminescence (PL) characteristics of core/shell quantum dot show that the maximum PL wavelength blue-shifts by about 80nm on increasing its intensity more than 6 times. Quantum yield (QY) of the CuInS2/ZnS QDs shows about 67% as the maximum value. The dispersion of the quantum dots in polystyrene, which is hydrophobic and transparent, was also conducted using co-dispersing toluene. Finally, the polystyrene/quantum dot composite was applied on blue LEDs and it showed luminous efficacy of 10.7lm/W and (0.4338, 0.1827) CIE coordinates. [Copyright &y& Elsevier]

Published
2011
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