Article
Chemistry, Multidisciplinary
Mingliang Li, Yaping Zhao, Xiangqian Qin, Qingshan Ma, Jianxun Lu, Kebin Lin, Peng Xu, Yuqing Li, Wengjing Feng, Wen-Hua Zhang, Zhanhua Wei
Summary: Recently, surface passivation has been shown to be crucial for achieving efficient and stable perovskite light-emitting diodes (Pero-LEDs). In this study, a conductive molecule, 2,7-bis(diphenylphosphoryl)-9,9'-spirobifluorene (SPPO13), was introduced to modify the perovskite emitting layer, leading to improved device performance.
Article
Nanoscience & Nanotechnology
Qun Wan, Lu Huang, Long Kong, Qinggang Zhang, Congyang Zhang, Mingming Liu, Xinrong Liao, Wenji Zhan, Weilin Zheng, Changwei Yuan, Mengda He, Liang Li
Summary: In the field of translucent displays, using an alkali metal/inert metal bilayer metal electrode and perovskite nanocrystals as an emitter layer allows for the fabrication of high-efficiency, high-color-purity, and high-brightness semitransparent LEDs, with great potential for applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
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.
Review
Optics
Runnan Yu, Changxiao Li, Biao Zhao, Zhan'ao Tan
Summary: This work reviews the research history of green perovskite light-emitting diodes (GPeLEDs), introduces perovskites of different dimensions, and discusses the common synthesis methods of perovskites. Additionally, strategies to improve the stability and luminous efficiency of GPeLEDs are summarized, including component engineering, phase engineering, ligand engineering, additive engineering, interface engineering, and optical coupling structure strategy. Finally, the development state of GPeLEDs is summarized and future prospects are discussed.
LASER & PHOTONICS REVIEWS
(2023)
Review
Chemistry, Multidisciplinary
Dexin Yang, Baodan Zhao, Tao Yang, Runchen Lai, Dongchen Lan, Richard H. Friend, Dawei Di
Summary: Metal halide perovskites, a promising class of materials for display and lighting applications, have seen a rapid increase in device efficiencies. However, challenges remain in achieving high operational stability and efficient blue emission. Interdisciplinary research involving materials scientists, chemists, and physicists is crucial for realizing operationally stable PeLEDs.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Cheng Chen, Tongtong Xuan, Yang Yang, Fan Huang, Tianliang Zhou, Le Wang, Rong-Jun Xie
Summary: This study proposes improving the optical properties of CsPbI3:Sr emissive layer (EML) in perovskite light-emitting diodes (PeLEDs) by inserting an additional potassium iodide (KI) passivation layer. The results demonstrate that the use of a KI layer can lead to high-performance PeLEDs with higher quantum efficiency and longer lifetime.
ACS APPLIED MATERIALS & INTERFACES
(2022)
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
Chemistry, Multidisciplinary
Chungen Hsu, Shun Tian, Yaxiao Lian, Guoling Zhang, Qian Zhou, Xuhui Cao, Baodan Zhao, Dawei Di
Summary: The study demonstrates an efficient single-pixel PeLED technology with high external quantum efficiency. By using a nanometer-thin lithium fluoride interlayer and preparing uniform and highly luminescent perovskite layers, successful manufacturing and integration of microPeLEDs are achieved.
CELL REPORTS PHYSICAL SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Guanding Mei, Xiangtian Xiao, Sajjad Ahmad, Hong Lin, Yangzhi Tan, Kai Wang, Xiao Wei Sun, Wallace C. H. Choy
Summary: This study demonstrates the importance of microcavity design for improving the light extraction efficiency of Perovskite light-emitting diodes (PeLEDs). The experiment shows that a high-efficiency horizontal dipole in the microcavity is the key to improving the efficiency.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Rashid Khan, Shenglong Chu, Zhijian Li, Kester O. Ighodalo, Wenjing Chen, Zhengguo Xiao
Summary: This study demonstrates a novel strategy to fabricate bright and large-area PeLEDs by depositing MAPbI(3) on top of MAPbCl(3) using orthogonal solvents, resulting in high external quantum efficiency and radiance, meeting the requirements of commercial applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Nan Li, Sofia Apergi, Christopher C. S. Chan, Yongheng Jia, Fangyan Xie, Qiong Liang, Gang Li, Kam Sing Wong, Geert Brocks, Shuxia Tao, Ni Zhao
Summary: By using diammonium halides to regulate the formation of mixed bromide-iodide perovskite films, the performance of 3D mixed-halide perovskite-based light-emitting diodes (LEDs) can be improved, resulting in devices with record luminance and half-lifetime.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Changjiu Sun, Yuanzhi Jiang, Minghuan Cui, Lu Qiao, Junli Wei, Yanmin Huang, Li Zhang, Tingwei He, Saisai Li, Hsien-Yi Hsu, Chaochao Qin, Run Long, Mingjian Yuan
Summary: The performance of perovskite light-emitting diodes tends to decline as the active area increases, with severe phase-segregation identified as the cause. The introduction of L-Norvaline to construct an intermediate phase has successfully suppressed the phase-segregation, resulting in highly-efficient large-area quasi-2D films.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Yan-Lin Xu, Xuan Lv, Min Zhu, Shuang-Qiao Sun, Wei He, Jun-Gui Zhou, Yue-Min Xie, Man-Keung Fung
Summary: In this study, efficient electron-transport layers (ETLs) for PeLEDs were formed by co-evaporating a high-mobility pyridine-based electron transport material, TmPyPB, with TPBi. The interaction between TmPyPB and the uncoordinated Pb2+ ions effectively passivates perovskite defects and enhances electron mobility, resulting in higher device efficiency.
MATERIALS TODAY ENERGY
(2023)
Article
Nanoscience & Nanotechnology
Yongheng Jia, Hui Yu, Yang Zhou, Nan Li, Yuwei Guo, Fangyan Xie, Zhaotong Qin, Xinhui Lu, Ni Zhao
Summary: The mechanism behind EQE roll-off in high-efficiency PeLEDs was investigated, revealing that migration and segregation of excess iodide ions from nonstoichiometric precursors triggered imbalanced charge injection. A simple wash-off treatment with chloroform and an ultra-thin PMMA interlayer were introduced to effectively suppress the roll-off behavior, leading to the achievement of high-brightness PeLEDs with improved performance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Kebin Lin, Chuanzhong Yan, Randy P. Sabatini, Wenjing Feng, Jianxun Lu, Kaikai Liu, Dongxin Ma, Yueyue Shen, Yaping Zhao, Mingliang Li, Chengbo Tian, Liqiang Xie, Edward H. Sargent, Zhanhua Wei
Summary: Perovskite light-emitting diodes (Pero-LEDs) have gained significant attention due to their high color purity and solution processing. Passivating non-radiative defects has been found to improve device performance. By utilizing a dual-phase regulation method, a CsPbBr3&Cs4PbBr6 perovskite layer with efficient electrical injection was grown, resulting in Pero-LEDs with high quantum efficiency and luminance.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Yajun Lian, Ye Yang, Lihong He, Xiaoli Yang, Jiulin Gao, Chaochao Qin, Lianbin Niu, Xiaohui Yang
Summary: This paper reveals the phase formation mechanism of FA-based DJ perovskites for the first time and proposes an effective small A-site cation compositional engineering strategy, which can improve the performance of optoelectronic devices and extend their lifetime, providing new possibilities for optoelectronic applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Environmental
Xinrui Chen, Shuai Tan, Chaochao Qin, Yafei Wang, Ha Lim Lee, Kyung Hyung Lee, Ke Qin, Huili Ma, Weiguo Zhu, Jun Yeob Lee
Summary: Efficient orange-red/red TADF emitters were achieved by encapsulating the red-emitting core with a blue emitting chromophore, demonstrating effective intramolecular energy transfer. The novel compounds showed higher photoluminescence quantum yields and improved external quantum efficiency in OLEDs compared to traditional TA-based OLEDs. This research provides an effective method for designing highly efficient red TADF molecules through intramolecular energy transfer.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Applied
Miao Li, Mingyue Yu, Lisi Yang, Na Yu, Yuanyuan Zhou, Lianghao Hu, Zaifei Ma, ChaoChao Qin, Ruiping Qin, Jinsheng Song
Summary: The ternary blend strategy with PBDB-T, Ph-DTDP-TIC and PC71BM as donor and acceptor materials has been shown to effectively enhance the performance of organic solar cells. Using PC71BM as the third component can improve charge transfer and transport, leading to improved photovoltaic performance in the ternary OSCs.
Article
Chemistry, Multidisciplinary
Jianghu Liang, Zhanfei Zhang, Qi Xue, Yiting Zheng, Xueyun Wu, Ying Huang, Xin Wang, Chaochao Qin, Zhenhua Chen, Chun-Chao Chen
Summary: Introducing a quantum well reversely graded structure through isopropanol washing into FA-MA mixed 2D perovskite films reduces the quantum confinement effect inside the film, extends the external quantum efficiency response wavelength, and results in out-of-plane orientation, significant grain size, and long carrier lifetime. An unprecedented power conversion efficiency of 20.12% was achieved, with high stability demonstrated through aging tests under different conditions.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Optics
Yonggang Yang, Yang Liu, Beidou Feng, Hua Zhang, Chaochao Qin, Kun Yu, Kai Jiang, Yufang Liu
Summary: Time-resolved femtosecond transient absorption spectroscopy was used to study the multi-color fluorescence of two donor-n-acceptor (D-n-A) models. The study found that the delay in fluorescence emission increased in glycerin/DMSO mixed solutions, and the changes were attributed to the rotation of the electron acceptor axis.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Multidisciplinary
Long Ji, Ting Zhang, Yafei Wang, Detao Liu, Hao Chen, Hualin Zheng, Xuefeng Peng, Shihao Yuan, Zhi David Chen, Shibin Li
Summary: The addition of ethylammonium bromide (EABr) to the methylammonium tin iodide (MASnI(3)) perovskite precursor solution can regulate the crystallization dynamics, improve film morphology, and enhance efficiency and stability of the perovskite solar cells. The combination of EA(+) and Br- ions in the precursor solution results in a champion power conversion efficiency (PCE) of 9.59% and maintains 93% of initial efficiency after 30 days without encapsulation. This work provides a new strategy for high-efficiency tin-based perovskite solar cells.
Article
Engineering, Environmental
Shihao Yuan, Ting Zhang, Hao Chen, Yu Ji, Yunhan Hao, Hualin Zheng, Yafei Wang, Zhi David Chen, Li Chen, Shibin Li
Summary: This study reports the use of a dual-functional molecular 2-Fluorothiophenol (FTP) to address the issues of ionic defects and humidity instability in FA-based perovskite solar cells. The results show that FTP can passivate defects and improve humidity stability, leading to an increase in solar cell efficiency. This research provides important technical support for the commercialization of FA-based perovskite solar cells.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Hairui Liu, Zuhong Zhang, Zhenhuang Su, Weiwei Zuo, Ying Tang, Feng Yang, Xilin Zhang, Chaochao Qin, Jien Yang, Zhe Li, Meng Li
Summary: The introduction of Y6 as a buffer layer for SnO2-based flexible perovskite solar cells enhances charge extraction ability, bending stability, and reduces internal stress of perovskite films. It also improves interfacial charge extraction and reduces defect density.
Article
Optics
Yonggang Yang, Qi Zhang, Yang Liu, Zhinan Jiang, Chaochao Qin, Kai Jiang, Yufang Liu
Summary: The dual fluorescence behaviors of 2-(2'-Hydroxyphenyl) benzothiazole (HBT) and 2-(2'-hydroxyphenyl) benzoxazole (HBO) molecules were studied using femtosecond transient absorption spectroscopy. The results showed that the proton transfer occurring in fs timescale is the main factor for the dual fluorescence of HBT.
JOURNAL OF LUMINESCENCE
(2022)
Article
Nanoscience & Nanotechnology
Yantao Mei, Xiayao Lu, Chen Dong, Furui Tan, Minghuan Cui, Yuki Haruta, Vishal Yeddu, Mengyue Wang, Kong Liu, Gentian Yue, Yueyue Gao, Shengchun Qu, Chaochao Qin, Weifeng Zhang, Liming Ding, Makhsud Saidaminov, Zhijie Wang
Summary: Carbon-based all-inorganic CsPbIxBr3-x perovskite solar cells show high stability and suitable band gap. Defects at grain boundaries (GBs) reduce the efficiency of the cell. This study turns the GBs into charge transport pathways using bipolar charge transport semiconductors, improving charge transport and balance at the GBs, resulting in high efficiency and enhanced stability.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Ceramics
Jiulin Gao, Xuefeng Peng, Chaochao Qin, Zongpu Wang, Xiaohui Yang
Summary: In this study, the effects of guanidinium thiocyanate (GaSCN) addition on the properties of quasi-two-dimensional perovskites were investigated. It was found that GaSCN could adjust the phase distribution, reduce defect density, and promote charge transport. As a result, the quasi-two-dimensional perovskite blue-emitting device with GaSCN exhibited a maximum external quantum efficiency of 8.39%, which was 4.26 times higher than that of the control device. This work highlights the potential of using pseudohalide additives to enhance the performance of quasi-two-dimensional perovskite blue-emitting devices.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Xuefeng Peng, Bingchen He, Hualin Zheng, Zhenhuang Su, Xiuzhi Li, Long Ji, Ting Zhang, Li Chen, Chaochao Qin, Xingyu Gao, Shibin Li, Xiaohui Yang
Summary: This study found that the phase distribution of Dion-Jacobson perovskites can be effectively modulated by DMSO vapor treatment, which improves the efficiency of perovskite light-emitting diodes and eliminates energy transfer gaps and losses.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Applied
Hualin Zheng, Xuefeng Peng, Tingxi Chen, Ting Zhang, Shihao Yuan, Lei Wang, Feng Qian, Jiang Huang, Xiaodong Liu, Zhi David Chen, Yanning Zhang, Shibin Li
Summary: The surface defects of 2D perovskite play a limiting role in the performance of perovskite solar cells (PVSCs). In this study, a modification strategy using 1-butyl-3-methylimidazolium trifluoromethanesulfonate (BMIMOTF) was found to effectively reduce defect density and suppress nonradiative recombination. The modified devices achieved a high efficiency of 21.38% and displayed enhanced humidity and thermal stability.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Zongpu Wang, Xuefeng Peng, Wei Chen, Zhenhuang Su, Yafei Wang, Zecheng Diao, Chaochao Qin, Lianbin Niu, Xingyu Gao, Xiaohui Yang
Summary: In this study, the incorporation of a PEA2PbBr4 interlayer is shown to effectively modify the crystallization process of solution-processed perovskite layers, resulting in improved film quality and device performance, as well as defect passivation for efficient sky-blue emission.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Automation & Control Systems
Yiding Gu, Ting Zhang, Jian Li, Chaoyue Zheng, Mingye Yang, Shibin Li
Summary: A capacitive triaxial force sensor based on microcone dielectric layer and force decoupling method is proposed in this study, which can perfectly detect the lateral and vertical displacement of the top electrode relative to the bottom electrodes under external forces. The sensor structure along with the new decoupling method exhibits high sensitivity (3.5 kPa(-1)) for normal force in a low-pressure range and fast response (0.134 N-1, 26 ms) for tangential force. By mounting the sensors on the fingers of a robotic arm, effective tactile information during grasping task can be provided. Furthermore, a 3x3 tactile sensor array is fabricated for spatial pressure mapping. This work provides new insights into the design of piezocapacitive tactile sensors and demonstrates their great potential in robotic applications.
ADVANCED INTELLIGENT SYSTEMS
(2023)
