Search

Your search keyword '"Im, Won Bin"' showing total 532 results
Start Over Author "Im, Won Bin"
532 results on '"Im, Won Bin"'

14. High Li+ Conductivity of Li1.3+xAl0.3−xMgxTi1.7(PO4)3 with Hybrid Solid Electrolytes for Solid‐State Lithium Batteries.

Author

Kim, Haena, Shaik, Mahammad Rafi, Kim, Sukju, Park, Yong Min, Jeon, Dong Won, Cho, Sung Beom, Choi, Sungho, Im, Won Bin, and Sun, Hongtao

Abstract

Solid‐state electrolytes (SSEs) are promising future power sources for electronic vehicles (EVs) and devices due to their enhanced safety features, high energy density, and nonflammability. The NASICON structure has emerged as a frontrunner in oxide‐based electrolytes, boasting high Li‐ion conductivity and air stability. Nevertheless, developing high‐performance oxide‐based electrolytes remains challenging due to their inherently hard and brittle nature, presenting obstacles to achieving an optimal interface between the cathode and anode. In this study, to overcome this issue and enhance electrochemical stability and Li‐ion conductivity, a new approach employing a hybrid solid electrolyte amalgamating polymer electrolytes with inorganic Li1.3+xAl0.3−xMgxTi1.7(PO4)3 powder (x = 0, 0.015, 0.030, 0.045, and 0.060) was investigated. Notably, employing nanosized Li1.3Al0.3Ti1.7(PO4)3 (LATP) synthesized via the sol–gel method led to a remarkable increase in ionic conductivity to 7.29 × 10–4 S cm–1, which was attributed to enhanced pellet density. Electrochemical analysis revealed that Li1.345Al0.255Mg0.045Ti1.7(PO4)3 exhibited superior specific capacity, stable high current density performance, and capacity recoverability compared to LATP. This pioneering study highlights the potential of hybrid solid electrolytes incorporating Mg‐doped LATP as a promising material for practical solid‐state lithium batteries. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

39. Advanced HIL strategies in QLEDs: V2O5 and PEDOT:PSS dual-layer for charge balance and electron leakage prevention.

Author

Bin Cho, Han, Kim, Ha Jun, Viswanath, Noolu Srinivasa Manikanta, Samanta, Tuhin, Min, Jeong Wan, Jang, Sung Woo, Park, Yong Min, Jang, Se Hyuk, Yang, Heesun, and Im, Won Bin

Abstract

Quantum dot light emitting devices (QLEDs) show promise for displays, with polyethylenedioxythiophene:polystyrene (PEDOT:PSS) commonly used as a hole injection layer (HIL) due to its high conductivity and work function. However, PEDOT:PSS-based QLEDs face an energy barrier, reducing efficiency. Herein, in this work, we used the rapid thermal annealing (RTA) process to improve the conductivity by controlling the RTA processing time which reduced the interfacial resistance. This improves charge balance and long-term stability by preventing electron leakage. The optimized V2O5/PEDOT:PSS-based QLED, with an EQE of 18%, CE of 77 cd A−1 and maximum luminance of 23 242 cd m−2, outperforms the PEDOT:PSS-based counterpart. This highlights the strategic superiority of V2O5 HIL in our QLED. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

40. Lone‐Pair‐Driven, Brightly Emitting Lead‐Free Zero‐Dimensional Inorganic Luminescent Member.

Author

Viswanath, Noolu Srinivasa Manikanta, Samanta, Tuhin, Yoon, Yeongjun, Jang, Sung Woo, Kim, Kyeounghak, and Im, Won Bin

Subjects
DENSITY functional theory, THERMOGRAPHY
Abstract

Zero‐dimensional (0D) 5s2‐metal halide (MH) materials offer potential for use in solid‐state lighting, optical thermography, and scintillation applications. The organic components of most highly luminescent materials are inherently unstable under moisture and thermal stress, which restricts their practical use in advanced applications. Hence, highly luminescent and stable inorganic luminescent materials are required. In this work, to the best of current knowledge, a 0D completely inorganic luminescent member of K2SbCl5 that exhibits orange emission at 610 nm with an 80% photoluminescence quantum yield (PLQY) is reported for the first time. Density functional theory calculations reveal that the [SbCl5]2‐ square pyramidal units are the only optically active emission centers in K2SbCl5. The white light‐emitting device utilizing K2SbCl5 demonstrates impressive performance metrics, boasting a substantial color rendering index (CRI) of 94 and an exceptional luminous efficacy of 118.1 lm W−1. Hence, this isolated [SbCl5]2−square pyramidal environment serves as a design principle for the development of highly efficient inorganic Sb3+‐based luminescent materials for future optoelectronic applications. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results