https://scholar.dgist.ac.kr/handle/20.500.11750/232 2026-04-05T16:30:21Z 2026-04-05T16:30:21Z 황영준 박재형 이윤구 https://scholar.dgist.ac.kr/handle/20.500.11750/57756 2025-07-25T02:42:46Z 2024-04-04T15:00:00Z

Title: Dibenzofuran-based Cross-linkable Hole Transport Materials for Highly Efficient Solution-processed Quantum Dot Light Emitting Diodes Author(s): 황영준; 박재형; 이윤구 Abstract: Cross-linkable hole transport materials (HTMs) are a feasible strategy for solutionprocessed quantum dot light-emitting diodes (QLEDs). However, previously developed cross-linkable HTMs showed poor hole transport properties, high cross-linking temperatures, which are all major obstacles to achieving high performance in solution-processed QLEDs. To address these issues, we designed and synthesized cross-linkable HTMs based on triphenylamine (TPA) with divinyl functional groups at the various positions of dibenzofuran (DBF). Notably, cross-linked 4-(dibenzo [b,d]furan-3-yl)-N,N-bis(4-vinylphenyl)aniline (3-CDTPA) exhibited a deep highest occupied molecular orbital energy level (5.50 eV), high hole mobility (2.44×104 cm2 V 1 s 1), low cross-linking temperature (150 ℃) as well as high external quantum efficiency, maximum current efficiency, and maximum power efficiency of 18.59%, 78.48 cdA1 , and 78.14 lmW1 , respectively.

2024-04-04T15:00:00Z Lee, Youngu https://scholar.dgist.ac.kr/handle/20.500.11750/57740 2025-07-25T02:43:20Z 2023-10-12T15:00:00Z

Title: 2D Material-wrapped Copper Nanowires for High-performance Energy Devices Author(s): Lee, Youngu Abstract: Wrapping metallic nanomaterials with two-dimensional (2D) materials can significantly improve the physical properties required for various electronic and catalytic applications. However, synthesizing 2D material-wrapped metal nanowires with highly organized shell morphology is still difficult because of their large surface area and high aspect ratio. In this talk, I will present the synthesis and characterization of 2D material-wrapped copper nanowires with highly organized shell morphology by using 2D quantum dot assembly and flash light irradiation for high-performance energy devices.

2023-10-12T15:00:00Z 황영준 이윤구 https://scholar.dgist.ac.kr/handle/20.500.11750/56776 2025-07-25T02:41:52Z 2023-10-11T15:00:00Z

Title: Photo-crosslinkable Hole Transport Material with an Azide Functional Group for Highly Efficient Quantum Dot Light-emitting Diodes Author(s): 황영준; 이윤구 Abstract: Poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt(4,4′-(N-(4-butylphenyl)))] (TFB) has been a widely used as hole transport material (HTM) in quantum dot light-emitting diodes (QLEDs). However, QLEDs using TFB have faced challenges due to interlayer erosions. To solve dissolution of the underlying layer, it is effective to introduce a crosslinkable group into HTM. Herein, we designed and synthesized new HTM, TFB-N3, with azide as a crosslinking functional group. The crosslinked TFB-N3 thin film exhibited high solvent resistance, smooth surface morphology, and improved charge-carrier transport ability compared to pristine TFB. TFB-N3 also showed a fast crosslinking time under UV irradiation. The green QLEDs based on TFB-N3 showed excellent external quantum efficiency, maximum current efficiency, and maximum power efficiency.

2023-10-11T15:00:00Z Lee, Youngu https://scholar.dgist.ac.kr/handle/20.500.11750/47111 2025-07-25T03:28:40Z 2017-10-26T15:00:00Z

Title: Copper Nanowire based Transparent Electrodes for Flexible Organic Electronic Devices Author(s): Lee, Youngu

2017-10-26T15:00:00Z