Ultrathin Interfacial Barrier Enables Voltage-Invariant Color Stability in Non-Doped White OLEDs Siqi Li, Xin Wang, Guodan Wei, Kai‐ning Tong, Yuanyu Zou, Hanxin Wang, Rong‐Jun Xie, Xin Pan, Wei He Advanced Optical Materials, 2025 Achieving voltage‐invariant color stability in white organic light‐emitting diodes (WOLEDs) is a critical challenge hindering their practical application, especially in simplified, non‐doped architectures. In this work, a highly‐efficient, spectrally stable non‐doped WOLED is presented by incorporating an ultrathin interfacial barrier layer of CzSi at the emission interface. This functional layer effectively confines excitons and stabilizes the recombination zone by suppressing electron leakage and excessive hole injection, thereby achieving excellent charge balance. The optimized bi‐color device achieves a peak external quantum efficiency (EQE) of 18.8%, a current efficiency of 49.5 cd A −1 , and a maximum luminance exceeding 13,090 cd m − 2 . Remarkably, the device exhibits minimal chromaticity drift (ΔCIExy = 0.003, 0.009) across a wide voltage range (4–10 V). Exciton recombination profiling and single‐carrier transport measurements confirm that the CzSi layer functions as a bidirectional energy barrier, finely regulating charge recombination and spatial exciton distribution. Furthermore, this approach is extended to tri‐color WOLEDs, which exhibit a high color rendering index (CRI) of 89 while maintaining excellent voltage‐invariant emission. The dopant‐free, minimalistic design offers a practical and scalable pathway for the development of high‐performance WOLEDs with outstanding color stability and fidelity, paving the way for advanced display and solid‐state lighting applications.
Pulsed laser-assisted direct fabrication of MoxW1-xS2 alloy-based flexible strain sensors with superior performance for high-temperature applications Kexin Wang, Hanxin Wang, Xiaoshan Zhang, Yingzhe Li, Yilin Zhou, Manzhang Xu, Weiwei Li, Lu Zheng, Xuewen Wang, Wei Huang Microsystems and Nanoengineering, 2025 Flexible strain sensors with high sensitivity and stability at high temperatures are significantly desirable for their accurate and long-term signal detection in wearable devices, environment monitoring, and aerospace electronics. Despite the considerable efforts in materials development and structural design, it remains a challenge to develop highly sensitive, flexible strain sensors operating at high temperatures due to the trade-off between sensitivity and stability for the representative sensing materials. Herein, we develop a high-temperature flexible sensor using MoxW1-xS2 alloy films. A pulsed laser is introduced to directly synthesize MoxW1-xS2 patterns with controllable compositions and physical parameters, enabling the realization of flexible sensors without photolithography or transfer procedures. The resultant flexible sensors exhibit a high gauge factor of 97.4, a low strain detection of 4.9 με, and strong tolerance to a temperature of 500 °C. Owing to its superior performance, we develop a wireless acoustic recognition system to distinguish tiny strain signals of tuning forks with a vibration frequency up to 128 Hz under extreme temperature conditions. The laser method for the direct fabrication of MoxW1-xS2 alloy-based flexible sensors holds great potential in the precise detection of strain signals from complex structures at high temperatures.
Reconfiguring nucleation for CVD growth of twisted bilayer MoS2 with a wide range of twist angles Manzhang Xu, Hongjia Ji, Lu Zheng, Weiwei Li, Jing Wang, Hanxin Wang, Lei Luo, Qianbo Lu, Xuetao Gan, Zheng Liu, Xuewen Wang, Wei Huang Nature Communications, 2024 Twisted bilayer (TB) transition metal dichalcogenides (TMDCs) beyond TB-graphene are considered an ideal platform for investigating condensed matter physics, due to the moiré superlattices-related peculiar band structures and distinct electronic properties. The growth of large-area and high-quality TB-TMDCs with wide twist angles would be significant for exploring twist angle-dependent physics and applications, but remains challenging to implement. Here, we propose a reconfiguring nucleation chemical vapor deposition (CVD) strategy for directly synthesizing TB-MoS2 with twist angles from 0° to 120°. The twist angles-dependent Moiré periodicity can be clearly observed, and the interlayer coupling shows a strong relationship to the twist angles. Moreover, the yield of TB-MoS2 in bilayer MoS2 and density of TB-MoS2 are significantly improved to 17.2% and 28.9 pieces/mm2 by tailoring gas flow rate and molar ratio of NaCl to MoO3. The proposed reconfiguring nucleation approach opens an avenue for the precise growth of TB-TMDCs for both fundamental research and practical applications.
Ultra-Stretchable Composite Organohydrogels Polymerized Based on MXene@Tannic Acid-Ag Autocatalytic System for Highly Sensitive Wearable Sensors Yuxin Zou, Guoqiang Liu, Hanxin Wang, Kang Du, Jinglun Guo, Zhenling Shang, Ruisheng Guo, Feng Zhou, Weimin Liu Small, 2024 Conductive hydrogels have attracted widespread attention in the fields of biomedicine and health monitoring. However, their practical application is severely hindered by the lengthy and energy‐intensive polymerization process and weak mechanical properties. Here, a rapid polymerization method of polyacrylic acid/gelatin double‐network organohydrogel is designed by integrating tannic acid (TA) and Ag nanoparticles on conductive MXene nanosheets as catalyst in a binary solvent of water and glycerol, requiring no external energy input. The synergistic effect of TA and Ag NPs maintains the dynamic redox activity of phenol and quinone within the system, enhancing the efficiency of ammonium persulfate to generate radicals, leading to polymerization within 10 min. Also, ternary composite MXene@TA‐Ag can act as conductive agents, enhanced fillers, adhesion promoters, and antibacterial agents of organohydrogels, granting them excellent multi‐functionality. The organohydrogels exhibit excellent stretchability (1740%) and high tensile strength (184 kPa). The strain sensors based on the organohydrogels exhibit ultrahigh sensitivity (GF = 3.86), low detection limit (0.1%), and excellent stability (>1000 cycles, >7 days). These sensors can monitor the human limb movements, respiratory and vocal cord vibration, as well as various levels of arteries. Therefore, this organohydrogel holds potential for applications in fields such as human health monitoring and speech recognition.
Laser-assisted synthesis of two-dimensional transition metal dichalcogenides: a mini review Hanxin Wang, Manzhang Xu, Hongjia Ji, Tong He, Weiwei Li, Lu Zheng, Xuewen Wang Frontiers in Chemistry, 2023 The atomically thin two-dimensional (2D) transition metal dichalcogenides (TMDCs) have attracted the researcher’s interest in the field of flexible electronics due to their high mobility, tunable bandgaps, and mechanical flexibility. As an emerging technique, laser-assisted direct writing has been used for the synthesis of TMDCs due to its extremely high preparation accuracy, rich light–matter interaction mechanism, dynamic properties, fast preparation speed, and minimal thermal effects. Currently, this technology has been focused on the synthesis of 2D graphene, while there are few literatures that summarize the progress in direct laser writing technology in the synthesis of 2D TMDCs. Therefore, in this mini-review, the synthetic strategies of applying laser to the fabrication of 2D TMDCs have been briefly summarized and discussed, which are divided into top-down and bottom-up methods. The detailed fabrication steps, main characteristics, and mechanism of both methods are discussed. Finally, prospects and further opportunities in the booming field of laser-assisted synthesis of 2D TMDCs are addressed.
Programmable patterned MoS2 film by direct laser writing for health-related signals monitoring Manzhang Xu, Jiuwei Gao, Juncai Song, Hanxin Wang, Lu Zheng, Yuan Wei, Yongmin He, Xuewen Wang, Wei Huang Iscience, 2021 and showed high performance of low detection limit (0.09%), high gauge factor (1,118), and high stability (1,000 cycles). Besides, we demonstrated its applications in real-time monitoring of health-related physiological signals such as radial artery pressure, respiratory rate, and vocal cord vibration. Our findings suggest that the laser-assisted method is effective and capable of synthesizing wafer-scale 2D TMDs, which opens new opportunities for the next flexible electronic devices and wearable health monitoring.
RECENT SCHOLAR PUBLICATIONS
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MOST CITED SCHOLAR PUBLICATIONS
Reconfiguring nucleation for CVD growth of twisted bilayer MoS 2 with a wide range of twist angles M Xu, H Ji, L Zheng, W Li, J Wang, H Wang, L Luo, Q Lu, X Gan, Z Liu, ... Nature Communications 15 (1), 562 , 2024 2024 Citations: 119
Ultra‐Stretchable Composite Organohydrogels Polymerized Based on MXene@ Tannic Acid‐Ag Autocatalytic System for Highly Sensitive Wearable Sensors Y Zou, G Liu, H Wang, K Du, J Guo, Z Shang, R Guo, F Zhou, W Liu Small 20 (47), 2404435 , 2024 2024 Citations: 39
Programmable patterned MoS2 film by direct laser writing for health-related signals monitoring M Xu, J Gao, J Song, H Wang, L Zheng, Y Wei, Y He, X Wang, W Huang Iscience 24 (11) , 2021 2021 Citations: 35
Laser-assisted synthesis of two-dimensional transition metal dichalcogenides: a mini review H Wang, M Xu, H Ji, T He, W Li, L Zheng, X Wang Frontiers in Chemistry 11, 1195640 , 2023 2023 Citations: 11
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Iontronic tip-sensing guidewires F Guan, N Bai, J Song, N Zhang, J Li, Y Jiang, Z Han, H Wang, J Shi, ... Nature Biomedical Engineering, 1-12 , 2025 2025 Citations: 3
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Ultrathin Interfacial Barrier Enables Voltage‐Invariant Color Stability in Non‐Doped White OLEDs S Li, X Wang, G Wei, K Tong, Y Zou, H Wang, RJ Xie, X Pan, W He Advanced Optical Materials 13 (36), e02468 , 2025 2025
