Article
Chemistry, Multidisciplinary
Ryo Yonemoto, Rieko Ueda, Akira Otomo, Yutaka Noguchi
Summary: In a light-emitting electrochemical cell (LEC), electrochemical doping facilitates charge injection and recombination emissions, resulting in high electroluminescence (EL) intensity at low driving voltages. In this study, a nanogap LEC (nano-LEC) consisting of a light-emitting polymer (F8BT) and an ionic liquid on a gold nanogap electrode was developed. The device demonstrated high EL intensity and a low threshold voltage at 300K. At low temperatures (<285K), the delayed components of the current and EL were strongly suppressed, indicating the nano-LEC as a promising approach for molecular-scale current-induced light sources.
Article
Chemistry, Multidisciplinary
Miaoxia Liu, Gerardo Salinas, Jing Yu, Antoine Cornet, Haidong Li, Alexander Kuhn, Neso Sojic
Summary: Multimodal imaging is a powerful approach that integrates multiple optical modalities in a single device, with potential applications in various fields. In this study, we developed wireless multimodal light-emitting chemical systems by coupling two light sources based on different physical principles. The results provide a novel alternative for designing autonomous hybrid systems with multimodal and multicolor optical readouts for complex bio-chemical systems.
Article
Chemistry, Multidisciplinary
Luca M. Cavinato, Sarah Woelfl, Alexander Poethig, Elisa Fresta, Claudio Garino, Julio Fernandez-Cestau, Claudia Barolo, Ruben D. Costa
Summary: This study reports on a new type of white light-emitting electrochemical cell, and successfully designs a blue-emitting complex, achieving high device performance and efficiency.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Junseok Jeong, Dae Kwon Jin, Joonghoon Choi, Junho Jang, Bong Kyun Kang, Qingxiao Wang, Won Il Park, Mun Seok Jeong, Byeong-Soo Bae, Woo Seok Yang, Moon J. Kim, Young Joon Hong
Summary: Remote epitaxy of GaN p-n homojunction microcrystals has been demonstrated for fabricating transferable, flexible white light-emitting diodes (WLEDs). The WLEDs show reliable performance even after repetitive bending and cycling temperature environments, making them suitable for flexible and modular light panels.
Article
Materials Science, Multidisciplinary
Abhishake Goyal, Dongze Wang, Jun Gao
Summary: This study demonstrates planar polymer light-emitting electrochemical cells (LECs) with concentric circle electrodes. By varying the inner electrode radius from 1 to 3 mm with a fixed outer electrode radius of 6.8 mm, all cells can be activated at 360 K with a 40 V bias. The large electrode gap size allows for time-lapsed imaging of the in situ electrochemical p- and n-doping processes, and the concentric circular electrode configuration offers a cross sectional view of an LEC-based light-emitting fiber. Furthermore, the sensitivity of junction position to relative electrode radius indicates the strong coupling of p- and n-doping reactions.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Natalia Fiuczek, Marta Sawicka, Anna Feduniewicz-Zmuda, Marcin Siekacz, Mikolaj Zak, Krzesimir Nowakowski-Szkudlarek, Grzegorz Muziol, Pawel Wolny, John J. Kelly, Czeslaw Skierbiszewski
Summary: This study demonstrates the electrochemical etching (ECE) of p-type GaN under constant bias without an external light source for the first time. By using a tunnel junction (TJ) as a cap, stable and controllable hole injection to the p-type semiconductor is achieved. The results provide a method for controllable ECE of p-type GaN using TJ for efficient hole injection.
Article
Materials Science, Multidisciplinary
Yue-Xing Chen, Xiao-Lei Shi, Zhuang-Hao Zheng, Fu Li, Wei-Di Liu, Wen-Yi Chen, Xin-Ru Li, Guang-Xing Liang, Jing-Ting Luo, Ping Fan, Zhi-Gang Chen
Summary: This study introduces p-type two-dimensional WSe2 nanoinclusions into n-type polycrystalline SnSe for the formation of p-n junctions, resulting in enhanced thermoelectric performance through phonon scattering and Fermi level control.
MATERIALS TODAY PHYSICS
(2021)
Article
Chemistry, Analytical
Silvia Cauteruccio, Valentina Pelliccioli, Sara Grecchi, Roberto Cirilli, Emanuela Licandro, Serena Arnaboldi
Summary: In this study, a wireless miniaturized stereoselective light-emitting system was designed to qualitatively detect chiral contaminants in reduced volumes. By mixing an inherently chiral inductor with a chiral probe in micro-solutions of a commercial ionic liquid, an asymmetric environment was created. The synergy between the inductor, the applied electric field, and the chiral pollutant was transduced by the light emission produced from a miniaturized light-emitting diode (LED) used as a bipolar electrode.
Article
Physics, Applied
Etienne Auroux, So-Ra Park, Joan Rafols-Ribe, Ludvig Edman
Summary: This study demonstrates that replacing conventional vacuum-deposited indium-tin-oxide (ITO) with solution-processed poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) as the positive anode in a light-emitting electrochemical cell (LEC) can increase the peak light-emission output by 75%. This increase is attributed to the shift of the p-n junction from a position of destructive interference with ITO to a position of constructive interference with PEDOT:PSS.
APPLIED PHYSICS LETTERS
(2022)
Article
Electrochemistry
Chaobei Tong, Abhishake Goyal, Dongze Wang, Jun Gao
Summary: This study visualized the effects of salt concentration in bilayer, planar polymer light-emitting electrochemical cells (PLECs). It demonstrated that the salt concentration and thickness of the solid polymer electrolyte (SPE) layer can alter the cell current, doping propagation speed, and junction formation time. The study also revealed the role of electrolyte ions in supporting doping current in PLECs and the impact of salt concentration on the behavior of electrolyte ions.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Shi Fang, Liuan Li, Weiyi Wang, Wei Chen, Danhao Wang, Yang Kang, Xin Liu, Hongfeng Jia, Yuanmin Luo, Huabin Yu, Muhammad Hunain Memon, Wei Hu, Boon S. Ooi, Jr-Hau He, Haiding Sun
Summary: This research reports a bipolar-junction photoelectrode with a gallium nitride (GaN) p-n homojunction nanowire array, operating in electrolyte, and demonstrating bipolar photoresponse controlled by different wavelengths of light. By rationally decorating the nanowires with a ruthenium oxide (RuOx) layer, guided by theoretical modeling, the resulting RuOx/p-n GaN photoelectrode exhibits significantly boosted bipolar photoresponse compared to the pristine nanowires. The loading of the RuOx layer optimizes surface band bending, promotes charge transfer, and enhances the efficiency of redox reactions, leading to improved positive and negative photocurrents. Lastly, a dual-channel optical communication system is constructed using only one photoelectrode to decode encrypted dual-band signals.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Yuxiang Song, Ping Yang
Summary: This study investigated the application of transition metal-doped carbon nanotubes in electrochemical catalytic reactions, showing excellent activity for electrocatalytic water splitting through the formation of MoS2/Co/N-doped carbon heterostructures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Shi Tang, Zhi Wang, Yanzi Xu, Huili Ma, Jia Wang, Christian Larsen, Dongfeng Dang, Ergang Wang, Ludvig Edman
Summary: The emission efficiency of organic semiconductors (OSCs) often suffers from aggregation caused quenching (ACQ). An elegant solution is aggregation-induced emission (AIE), which inhibits quenching pi-pi interactions and non-radiative motional deactivation by designing the morphology of the OSC. This study investigates the retention of AIE morphology during the operation of light-emitting electrochemical cells (LECs) and finds that AIE-LECs outperform ACQ-LECs due to intact AIE morphology and appropriate free-volume voids for ion transport and suppressed non-radiative excitonic deactivation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Keiichi Imato, Taichi Hino, Naoki Kaneda, Ichiro Imae, Naoki Shida, Shinsuke Inagi, Yousuke Ooyama
Summary: This study reports on wireless electrochemical soft actuators composed of hydrogels, which demonstrate muscle-like shrinking and swelling at microscopic and even macroscopic scales.
Article
Physics, Applied
Wai Yuen Fu, Hoi Wai Choi
Summary: A light-emitting bipolar transistor (LEBJT) has been developed by utilizing the existing LED structure to construct a PNP bipolar junction transistor, eliminating the need for customized structures or epitaxial regrowth. Two designs of GaN LEBJT were demonstrated, with one featuring a larger emitter area for electronic-optical signal conversion and another with a reduced emitter area for increased current gain.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Shiyu Hu, Xu Chi, Shulun Chen, Faleh AlTal, Jun Gao
JOURNAL OF PHYSICAL CHEMISTRY C
(2017)
Article
Chemistry, Physical
Shiyu Hu, Jun Gao
JOURNAL OF PHYSICAL CHEMISTRY C
(2018)
Article
Optics
Xueshan Han, Jianqi Shen, Pengteng Yin, Shiyu Hu, Duo Bi
OPTICS COMMUNICATIONS
(2014)
Article
Materials Science, Multidisciplinary
Shiyu Hu, Jun Gao
ADVANCED MATERIALS TECHNOLOGIES
(2018)
Article
Nanoscience & Nanotechnology
Shiyu Hu, Jun Gao
ACS APPLIED MATERIALS & INTERFACES
(2019)
Article
Electrochemistry
Shiyu Hu, Jun Gao
ELECTROCHIMICA ACTA
(2019)
Article
Electrochemistry
Shiyu Hu, Jun Gao
Article
Nanoscience & Nanotechnology
Kiran Birdee, Shiyu Hu, Jun Gao
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Materials Science, Multidisciplinary
Dongze Wang, Shiyu Hu, Jun Gao
Summary: Semiconductor junctions play a crucial role in modern technology. The solid polymer light-emitting electrochemical cell (PLEC) features a homojunction that can be partially de-doped into a p-i-n structure through controlled heating/cooling cycles. The authors observed phenomena like bright reverse bias electroluminescence and hypersensitivity to temperature in the frozen polymer p-i-n junction, which can be explained by a model based on tunnel injection of charge carriers.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Shiyu Hu, Shoude Chang, Gaozhi Xiao, Jianping Lu, Jun Gao, Yanguang Zhang, Ye Tao
Summary: A new type of stretchable triboelectric nanogenerator (TENG) was reported in this study, which can effectively operate in both pressing and stretching modes due to its unique structural design. The TENG shows different output voltages, current densities, and power densities in different modes. The excellent electrical properties of the stretchable conductive composite make TENG resilient against mechanical deformation, demonstrating versatile applications in energy harvesting and sensing.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Materials Science, Multidisciplinary
Shiyu Hu, John Weber, Shoude Chang, Gaozhi Xiao, Jianping Lu, Jun Gao, Weihong Jiang, Yanguang Zhang, Ye Tao
Summary: A new sliding triboelectric nanogenerator (TENG) has been developed, which is easy to fabricate and low cost. It can directly power LEDs, sustainably power small wearable and portable electronics, and harvest energy from tensile motion associated with human activities.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Multidisciplinary
Shiyu Hu, Hung-Wei Yeh, Jun Gao
Summary: Polymer light-emitting electrochemical cells (PLECs) using silver trifluoromethanesulfonate (Ag triflate) salt exhibit high luminance and efficiency, activating over 100 times faster than other optimized cells. The high performance is attributed to the partial chemical doping of the light-emitting polymer by silver cations, providing a new approach for designing high-performance mixed conductor devices.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Nanoscience & Nanotechnology
Jun Gao, Shulun Chen, Faleh AlTal, Shiyu Hu, Laurent Bouffier, Guillaume Wantz
ACS APPLIED MATERIALS & INTERFACES
(2017)