Search

Your search keyword '"Kim, Dong Hwan"' showing total 18 results
Start Over Author "Kim, Dong Hwan" Journal journal of the korean physical society
18 results on '"Kim, Dong Hwan"'

9. Erratum to: Journal of the Korean Physical Society, Vol. 71, No. 10

Author

Shin, Dong Hee, Heo, Jin Hyuck, Im, Sang Hyuk, Lee, Rena, Kim, Kyubo, Cho, Samju, Lim, Sangwook, Lee, Suk, Shim, Jang Bo, Huh, Hyun Do, Lee, Sang Hoon, Ahn, Sohyun, Nobi, Ashadun, Lee, Jae Woo, Lim, Hyunwoo, Lee, Hunwoo, Cho, Hyosung, Seo, Changwoo, Je, Uikyu, Park, Chulkyu, Kim, Kyuseok, Kim, Guna, Park, Soyoung, Lee, Dongyeon, Kang, Seokyoon, Lee, Minsik, Cao, Jingtai, Zhao, Xiaohui, Li, Zhaokun, Liu, Wei, Gu, Haijun, Kang, In Ho, Na, Moon Kyong, Seok, Ogyun, Moon, Jeong Hyun, Kim, H. W., Kim, Sang Cheol, Bahng, Wook, Kim, Nam Kyun, Park, Him-Chan, Yang, Chang Heon, Kim, Kyungil, Kim, Youngman, Lee, Kang Seog, Hong, Yoo-Seung, Cho, Chun-Hyung, Sung, Hyuk-Kee, Hyun, June-Won, Kim, Gang Bae, Lee, Ju Ho, Kim, Yeon Jung, Hwang, Seungjin, Jeong, Jihoon, Cho, Seryeyohan, Lee, Jongmin, Yu, Tae Jun, Lee, Kang Il, Lee, Geon Joon, Park, Gyungsoon, Choi, Eun Ha, Kim, Dong-Hwan, Jeong, Jun-Seok, Eom, Su-Keun, Lee, Jae-Gil, Seo, Kwang-Seok, Cha, Ho-Young, Ko, Young Joon, Kim, Hyun Soo, Jung, Jong Hoon, Jeong, Inho, Song, Hyunwook, Lee, B. C., Jang, Hyunchul, Kim, Byongju, Koo, Sangmo, Park, Seran, Ko, Dae-Hong, Ahn, Kwang Jun, Cho, Sungwan, Kim, Sang Goon, Hong, Kimin, Shim, Seung-Bo, Jo, Myunglae, Cho, Sung Un, Park, Yun Daniel, Kim, Hee-Cheol, and Kim, Seok

Published
2017
Full Text
View/download PDF

17. Formation of the mid-gap state in SrZrO3 nanocrystals by Eu-ion doping and its possible relation to the visible emission

Author

Kim, Dong-Hwan and Lee, Yun-Sang

Abstract

Abstract: We investigated the optical properties of SrZrO3 nanocrystals (NC) with Eu3+-ion doping by using optical and photoluminescence spectroscopic techniques. The combination of the red emission for Eu3+ ions and the blue-violet emission from the host matrix could be utilized for a white phosphor. The SrZrO3:Eu NCs were synthesized using the combustion method and were then post-annealed at various annealing temperatures (T anneal ). In the absorption spectra of the NCs, the fundamental bandgap increased with increasing T anneal , and more interestingly, the mid-gap state that formed below the bandgap evolved. The development of the mid-gap absorption is in accord with the red emission behavior for Eu3+ ions in the 325-nm photo-excitation. We also discuss the dependences of the blue-violet and the red emissions on the Eu3+-doping concentration and on the T anneal .

Published
2012
Full Text
View/download PDF

18. Photoluminescence in SrHfO3 nanocrystals in relation to self-trapped excitons

Author

Kim, Dong-Hwan and Lee, Yun-Sang

Abstract

Abstract: We investigated the blue emission of wide bandgap SrHfO3 nanocrystals by using 325-nm photoexcitation. The nanocrystals were initially synthesized by using the combustion method, then, as-synthesized crystals were annealed at different temperatures ranging from 700 °C to 1450 °C. With annealing at higher temperatures, the grain size, as well as the degree of crystallinity of nanocrystals increased. Interestingly, in contrast to the bulk case, the SrHfO3 nanocrystals showed a strong blue emission even at room temperature, which could be explained in the framework of self-trapped excitons. A non-monotonic evolution of the visible emission band with increasing annealing temperature was observed due to the combination of the grain size effect and oxygen vacancy formation. The blue emission observed in SrHfO3 NCs was stronger than that observed in a similar material SrZrO3, which might originate from the high dielectric constants in the former.

Published
2012
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results