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Your search keyword '"Sim, Young Chul"' showing total 15 results
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15 results on '"Sim, Young Chul"'

9. A broadband ultraviolet light source using GaN quantum dots formed on hexagonal truncated pyramid structures

Author

Cho, Jong-Hoi, primary, Lim, Seung-Hyuk, additional, Jang, Min-Ho, additional, Lee, Chulwon, additional, Yeo, Hwan-Seop, additional, Sim, Young Chul, additional, Kim, Je-Hyung, additional, Matta, Samuel, additional, Alloing, Blandine, additional, Leroux, Mathieu, additional, Park, Seoung-Hwan, additional, Brault, Julien, additional, and Cho, Yong-Hoon, additional

Published
2020
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13. Modulation of Growth Kinetics of Vacuum-Deposited CsPbBr3Films for Efficient Light-Emitting Diodes

Author

Shin, Mingue, Lee, Ho Seung, Sim, Young Chul, Cho, Yong-Hoon, Cheol Choi, Kyung, and Shin, Byungha

Abstract

Because of its excellent optical properties and good stability, all-inorganic halide perovskite CsPbX3(X = I, Br, Cl) has been attracting interest for use in light-emitting diodes (LEDs). One challenge is improving the efficacy of the spatial confinement of excitons for higher luminescence efficiency. Here, we present a simple yet very effective strategy to form fine-grain-structured CsPbBr3polycrystalline films prepared by thermal co-evaporation. The strategy involves controlling growth kinetics by adjusting the deposition rate, which, along with growth temperature, determines the nucleation rate and therefore the eventual grain structure. A correlation between deposition rate and average grain size was noted except for a very large deposition rate when there were large hillocks, which we attributed to the peculiar growth behavior of PbBr2films. The growth conditions that produced a nanoscale grain structure and textured orientations without large hillocks also resulted in the highest luminescence efficiency as we anticipated. With the optimized CsPbBr3light emitters, we demonstrate a green-light-emitting (at 524 nm) LED with a maximum current efficiency of 1.07 cd/A and an extremely narrow electroluminescence spectrum of 18 nm, a result that highlights the potential of vacuum-processed CsPbBr3films for high-efficiency LEDs.

Published
2020
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15. Modulation of Growth Kinetics of Vacuum-Deposited CsPbBr 3 Films for Efficient Light-Emitting Diodes.

Author

Shin M, Lee HS, Sim YC, Cho YH, Cheol Choi K, and Shin B

Abstract

Because of its excellent optical properties and good stability, all-inorganic halide perovskite CsPbX 3 (X = I, Br, Cl) has been attracting interest for use in light-emitting diodes (LEDs). One challenge is improving the efficacy of the spatial confinement of excitons for higher luminescence efficiency. Here, we present a simple yet very effective strategy to form fine-grain-structured CsPbBr 3 polycrystalline films prepared by thermal co-evaporation. The strategy involves controlling growth kinetics by adjusting the deposition rate, which, along with growth temperature, determines the nucleation rate and therefore the eventual grain structure. A correlation between deposition rate and average grain size was noted except for a very large deposition rate when there were large hillocks, which we attributed to the peculiar growth behavior of PbBr 2 films. The growth conditions that produced a nanoscale grain structure and textured orientations without large hillocks also resulted in the highest luminescence efficiency as we anticipated. With the optimized CsPbBr 3 light emitters, we demonstrate a green-light-emitting (at 524 nm) LED with a maximum current efficiency of 1.07 cd/A and an extremely narrow electroluminescence spectrum of 18 nm, a result that highlights the potential of vacuum-processed CsPbBr 3 films for high-efficiency LEDs.

Published
2020
Full Text
View/download PDF

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