Article
Chemistry, Physical
Xinyu Shen, Hua Wu, Xiaoyu Zhang, Meili Xu, Junhua Hu, Jinyang Zhu, Bin Dong, William W. Yu, Xue Bai
Summary: The all-solution process for inorganic perovskite nanocrystals (PNCs) LEDs shows great potential for new-generation illumination and displays, but the challenge lies in the injection barriers and charge injection imbalance. The introduction of CBP into the hole transport layer (HTL) efficiently modulates the charge carrier mobility and energy level, resulting in barrier-free charge injection and optimal performance for solution-processed PNC LEDs. The luminance of red LEDs reaches 2990 cd m(-2) and the external quantum efficiency achieves 8.1%, with improved turn-on voltage and roll-off due to more balanced charge injection.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Review
Chemistry, Physical
Taesoo Lee, Minhyung Lee, Hansol Seo, Minjun Kim, Beomsoo Chun, Jeonghun Kwak
Summary: This review summarizes previous studies on top-emitting device structures and discusses ways to improve the performance of top-emitting quantum dot-based light-emitting diodes (TQLEDs). The relevant theories for the optoelectrical properties of TQLEDs are introduced, and advancements in device optimization are presented. Multilateral strategies for TQLEDs to be widely applied in advanced industries are also discussed. This review aims to provide valuable insights for realizing commercial TQLEDs applicable to a broad range of applications.
Article
Chemistry, Physical
Li Song, Lixin Huang, Yuan Liu, Xiaoyang Guo, Chong Geng, Shu Xu, Yuanqin Xia, Yuan Zhang, Nannan Luan, Yongsheng Hu
Summary: An efficient bilateral interfacial defect passivation strategy was demonstrated for high-performance PeLEDs based on thermally deposited CsPbBr3, which significantly suppressed nonradiative defects and balanced charge injection effectively, resulting in PeLEDs with high luminance, current efficiency, external quantum efficiency, and lifetime.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Yunke Zhu, Yunzhou Deng, Peng Bai, Xinan Wu, Yige Yao, Qinyun Liu, Jingjing Qiu, An Hu, Zhenyu Tang, Wenjin Yu, Yaolong Li, Pengzuo Jiang, Zhetong Liu, Peng Gao, Yanlei Hao, Wangxiao Jin, Desui Chen, Xitong Zhu, Yizheng Jin, Yunan Gao
Summary: This study demonstrates efficient, bright, and long lifetime red Nc-LEDs based on anisotropic nanocrystals. By modifying the substrate's surface properties and controlling the interactions among nanocrystals, a self-assembled layer with a high distribution of in-plane transitions dipole moment of 95% is successfully achieved, resulting in an out-coupling factor of 37%.
ADVANCED MATERIALS
(2023)
Review
Materials Science, Multidisciplinary
Zhaojun Liu, Byung-Ryool Hyun, Yujia Sheng, Chun-Jung Lin, Mengyuan Changhu, Yonghong Lin, Chih-Hsiang Ho, Jr-Hau He, Hao-Chung Kuo
Summary: Micro-light-emitting diodes (Micro-LEDs) based on gallium nitride (GaN) materials offer versatile platforms for various applications, including displays, data communication tools, photodetectors, and sensors. By combining with quantum dots, Micro-LEDs can achieve efficient full-color displays and high-speed visible light communications.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Physical
Lianna Chen, Zhiyuan Qin, Shuming Chen
Summary: In this study, a new method has been developed to achieve high-resolution pixelated emission by controlling the thickness of transparent electrodes, resulting in a color-converting cavity that can selectively convert unpatterned quantum-dot white emission into saturated red, green, and blue emission. This method enables ultrahigh density red, green, and blue emission with a resolution of approximately 1700 pixels per inch, as well as achieving a color gamut of 111% NTSC.
Article
Chemistry, Multidisciplinary
Yalian Weng, Guixiong Chen, Junyang Nie, Sihua Que, Suk-Ho Song, Yongshen Yu, Fan Zhang, Hengshan Liu, Xiongtu Zhou, Yongai Zhang, Jie Sun, Jang-Kun Song, Chaoxing Wu, Tailiang Guo, Qun Yan
Summary: This work proposed a novel hybrid device of organic LEDs and inorganic blue GaN LEDs, which can achieve full white and other colors. By applying timing variable opposite voltages, the hybrid device can independently control the emission from blue LEDs or stacked OLEDs to form mixed colors. It has a high color gamut and color rendering index, indicating potential applications in smart solid-state lighting, display, and light communication.
Article
Chemistry, Multidisciplinary
Mingyuan Xie, Jie Guo, Xiaoyu Zhang, Chenghao Bi, Lin Zhang, Zema Chu, Weitao Zheng, Jingbi You, Jianjun Tian
Summary: This study presents a solution to achieve high-efficiency pure-red perovskite light-emitting diodes (PeLEDs) by stabilizing the structure of quantum dots and reducing adverse effects. The use of composite ligands helped stabilize the strong-confined quantum dots and suppress Auger recombination in the devices. Additionally, adjustments in the valence band of the quantum dots improved charge injection balance in the PeLEDs.
Article
Nanoscience & Nanotechnology
Songman Ju, Chaomin Mao, Jinping Zheng, Kaiyu Yang, Lihua Lin, Tailiang Guo, Hailong Hu, Fushan Li
Summary: This work proposes a new strategy to enhance the electroluminescent performance of perovskite quantum dots (PQDs) by creating a PQD film. By manipulating the ion distribution and trap density in the PQD film through varying pre-bias voltage and time, the device's capacitance value and luminous efficiency can be modified. The external quantum efficiency of the device increased from 2.81% to 7.95% through this strategy. This research provides a new approach for achieving perovskite quantum dot light-emitting devices with high luminous efficiency.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Denglin Zhao, Yueting Zheng, Tingtao Meng, Yangbin Zhu, Jipeng Jing, Xiang Chen, Hongjin Gao, Chaomin Mao, Wenchen Zheng, Hailong Hu, Tailiang Guo, Fushan Li
Summary: This study demonstrated the fabrication of a highly ordered QD monolayer with the LB technique, which significantly improved the performance and lifetime of QLEDs. The LB-HL strategy showed promising scalability for large-area QD monolayers.
SCIENCE CHINA-MATERIALS
(2022)
Article
Optics
Ana Sanchez-Solis, Diego Esparza, Angelica Orona-Navar, Alejandro Torres-Castro, Jesus Manuel Rivas, Nancy Ornelas-Soto, Tzarara Lopez-Luke
Summary: Highly reproducible quaternary CdZnSeS quantum dots were successfully synthesized, with emissions of blue, green, yellow, or red obtained by varying the concentrations of Cd to Zn and Se to S. These CdZnSeS QDs were utilized as the emissive layer in LEDs, leading to the generation of bright single colors of blue, green, or red.
JOURNAL OF LUMINESCENCE
(2021)
Article
Chemistry, Multidisciplinary
Zhong Fu, Likuan Zhou, Yue Yin, Kangkang Weng, Fu Li, Shaoyong Lu, Dan Liu, Wenyong Liu, Longjia Wu, Yixing Yang, Haifang Li, Lian Duan, Hai Xiao, Hao Zhang, Jinghong Li
Summary: Researchers report a new method called light-triggered, carbocation-enabled ligand stripping (CELS) to pattern quantum dot light-emitting diodes (QLEDs) with high efficiency and stability. This method shows promising results for building high-performance QLED displays and related integrated devices.
Article
Optics
Hua Shao, Chunshuang Chu, Chia-Ming Chuang, Sheng Hang, Jiamang Che, Jianquan Kou, Kangkai Tian, Yonghui Zhang, Quan Zheng, Zi-Hui Zhang, Qing Li, Hao-Chung Kuo
Summary: In this study, a step-type quantum well structure is proposed to enhance the external quantum efficiency of GaN-based yellow micro light-emitting diodes. By reducing the polarization mismatch and valence band barrier height, the proposed design improves hole injection capability and decreases leakage current. Additionally, the step-type quantum wells minimize hole spreading to mesa edges, suppressing surface nonradiative recombination.
Article
Chemistry, Multidisciplinary
Peili Gao, Zinan Chen, Shuming Chen
Summary: This study investigates the degradation mechanism of blue quantum-dot light-emitting diodes (B-QLEDs) and reveals the accumulation of electrons in the quantum-dots (QDs) as the main cause of device degradation. The accumulated electrons induce the detachment of ligands and degrade the hole transport layer (HTL), while surface defects and HTL decomposition also contribute to B-QLEDs' stability.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Taesoo Lee, Byong Jae Kim, Hyunkoo Lee, Donghyo Hahm, Wan Ki Bae, Jaehoon Lim, Jeonghun Kwak
Summary: This study demonstrates bright and stable QLEDs on a Si substrate, achieving high brightness, efficiency, and stability through tailored interface and optimized device structure, pushing the development and application of QLEDs.
ADVANCED MATERIALS
(2022)
Article
Physics, Multidisciplinary
Min-Sik Kwon, Byoung Yong Oh, Su-Hyun Gong, Je-Hyung Kim, Hang Kyu Kang, Sooseok Kang, Jin Dong Song, Hyoungsoon Choi, Yong-Hoon Cho
PHYSICAL REVIEW LETTERS
(2019)
Article
Optics
Shahriar Aghaeimeibodi, Je-Hyung Kim, Chang-Min Lee, Mustafa Atabey Buyukkaya, Christopher Richardson, Edo Waks
Article
Chemistry, Multidisciplinary
Hyoju Kim, Jong Sung Moon, Gichang Noh, Jieun Lee, Je-Hyung Kim
Review
Optics
Je-Hyung Kim, Shahriar Aghaeimeibodi, Jacques Carolan, Dirk Englund, Edo Waks
Article
Chemistry, Multidisciplinary
Minseong Kim, Jihyung Seo, Jihyun Kim, Jong Sung Moon, Junghyun Lee, Je-Hyung Kim, Joohoon Kang, Hyesung Park
Summary: Chemical vapor deposition (CVD) using liquid-phase precursors has limitations in synthesizing large-area transition metal dichalcogenide (TMD) thin films. However, a promoter-assisted liquid-phase CVD process with transition metal-containing precursor homogeneously modified with an alkali metal halide can successfully synthesize high-quality large-area monolayer molybdenum diselenide (MoSe2) with superior electrical transport characteristics.
Article
Nanoscience & Nanotechnology
Jong Sung Moon, Haneul Lee, Jin Hee Lee, Woong Bae Jeon, Dowon Lee, Junghyun Lee, Seoyoung Paik, Sang-Wook Han, Rolf Reuter, Andrej Denisenko, Joerg Wrachtrup, Sang-Yun Lee, Je-Hyung Kim
Summary: The study demonstrates high-resolution imaging of defects in diamonds using microsphere-assisted confocal microscopy, achieving improved spatial resolution and optical signal-to-noise ratio. This approach does not require complicated fabrication or additional optical systems, making it an efficient way to image and address closely spaced defects with better resolution and sensitivity.
Article
Optics
Kyu-Young Kim, Christopher J. K. Richardson, Edo Waks, Je-Hyung Kim
Summary: Researchers have successfully demonstrated single-photon pulses at a telecom wavelength with a Gaussian-like temporal mode profile from a cavity-coupled single quantum dot. By engineering the exciton dynamics and utilizing cascade recombination, they are able to modify the rise and decay dynamics of single excitons, leading to possible purification of single photons at high excitation power. Additionally, coupling quantum dots into a low Q cavity mode results in a Gaussian-like spatial mode profile, bringing a high collection efficiency.
Article
Nanoscience & Nanotechnology
Ting-Yuan Chang, Hyunseok Kim, William A. Hubbard, Khalifa M. Azizur-Rahman, Jung Jin Ju, Je-Hyung Kim, Wook-Jae Lee, Diana Huffaker
Summary: This article reports on the monolithic integration of InAsP quantum dots embedded in InP nanowires on silicon, showing potential for building next-generation quantum light sources.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Jin Hee Lee, Woong Bae Jeon, Jong Sung Moon, Junghyun Lee, Sang-Wook Han, Zoltan Bodrog, Adam Gali, Sang-Yun Lee, Je-Hyung Kim
Summary: The study found that point-planar defect complexes in silicon carbide nanowires exhibit outstanding optical properties, potentially enabling highly efficient quantum interactions between multiple qubits.
Article
Optics
Junghyun Sung, Dongjin Shin, HyunHee Cho, Seong Won Lee, Seungmin Park, Young Duck Kim, Jong Sung Moon, Je-Hyung Kim, Su-Hyun Gong
Summary: In this study, indirect-bandgap transition lasing under continuous-wave excitation at room temperature is demonstrated in an ultra-thin WS2 disk. It is shown that a 50-nm-thick WS2 disk provides sufficient optical gain and whispering gallery modes for lasing action. These results offer a new direction for van-der-Waals-material-based nanophotonics and introduce the possibility for optical devices based on indirect-bandgap materials.
Article
Quantum Science & Technology
Woong Bae Jeon, Jong Sung Moon, Kyu-Young Kim, Young-Ho Ko, Christopher J. K. Richardson, Edo Waks, Je-Hyung Kim
Summary: This study demonstrates a highly efficient fiber-interfacing photonic device that launches single photons from quantum dots directly into a standard single-mode fiber. The device utilizes optimized photonic structures and a precise pick-and-place technique, resulting in a plug-and-play single-photon device.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Hyoju Kim, Jong Sung Moon, Gichang Noh, Jieun Lee, Je-Hyung Kim
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Article
Physics, Applied
Simon J. U. White, Ngoc My Hanh Duong, Alexander S. Solntsev, Je-Hyung Kim, Mehran Kianinia, Igor Aharonovich
PHYSICAL REVIEW APPLIED
(2020)
Article
Chemistry, Multidisciplinary
Jong-Hoi Cho, Seung-Hyuk Lim, Min-Ho Jang, Chulwon Lee, Hwan-Seop Yeo, Young Chul Sim, Je-Hyung Kim, Samuel Matta, Blandine Alloing, Mathieu Leroux, Seoung-Hwan Park, Julien Brault, Yong-Hoon Cho
NANOSCALE ADVANCES
(2020)
Article
Engineering, Electrical & Electronic
Christopher J. K. Richardson, Richard P. Leavitt, Je-Hyung Kim, Edo Waks, Ilke Arslan, Bruce Arey
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2019)
