Article
Chemistry, Multidisciplinary
Hanming Li, Hong Lin, Dan Ouyang, Canglang Yao, Can Li, Jiayun Sun, Yilong Song, Yufeng Wang, Yanfa Yan, Yong Wang, Qingfeng Dong, Wallace C. H. Choy
Summary: By incorporating PMA during the synthesis of nanocrystals, it helps improve the stability and efficiency of perovskite light-emitting diodes, achieving high efficiency and stability for red-emitting PeLEDs.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Dejian Chen, Decai Huang, Mingwei Yang, Kunyuan Xu, Jie Hu, Sisi Liang, Haomiao Zhu
Summary: By using a new precursor HPbX3, high-quality perovskite nanocrystals with enhanced luminous efficiency and stability are obtained. The nanocrystals prepared from HPbX3 exhibit a high photoluminescence quantum yield of 96% and remain stable in air for more than two months. The improved stability under UV light irradiation, water, and thermal conditions is attributed to the lower structural defect density ensured by the abundant halogen in the precursor.
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
Chemistry, Physical
Jianbin Zhang, Wei Shen, Shuo Chen, Zixuan Zhang, Bo Cai, Yue Qiu, Yi Liu, Jiayu Jiang, Yanxing He, Meng Nan, Yanfeng Chen, Zhan Su, Yujun Dai, Lihui Liu, Shufen Chen
Summary: Researchers employed a novel multidentate short ligand, tetramethylthiuram disulfide (TMTD), through a ligand exchange process to enhance hole mobility and decrease trap density of CsPbI3 nanocrystal films. The TMTD-passivated CsPbI3 nanocrystal LED exhibited a maximum external quantum efficiency of 20.65% and a maximum luminance of 3861 cd/m2. Furthermore, the TMTD-passivated CsPbI3 nanocrystal LED showed good operational stability with a half-lifetime of 128 minutes. This strategy using multidentate short ligand passivation provides an effective approach for the development and commercialization of perovskite LEDs.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Multidisciplinary Sciences
Joo Sung Kim, Jung-Min Heo, Gyeong-Su Park, Seung-Je Woo, Changsoon Cho, Hyung Joong Yun, Dong-Hyeok Kim, Jinwoo Park, Seung-Chul Lee, Sang-Hwan Park, Eojin Yoon, Neil C. Greenham, Tae-Woo Lee
Summary: This study reports the development of ultra-bright, efficient, and stable light-emitting diodes (PeLEDs) made of core/shell perovskite nanocrystals. The nanocrystals, obtained through in situ reaction of benzylphosphonic acid with polycrystalline perovskite films, demonstrate strong carrier confinement and maintain good charge-transport properties.
Article
Materials Science, Multidisciplinary
Jie Li, Zhenwei Ren, Wenlin Xia, Chengzhao Luo, Zhishuai Zheng, Wenchen Ma, Huifeng Ji, Yu Chen
Summary: This study proposes a new method of dynamically treating quasi-2D perovskite film with DDAB to achieve stable and efficient pure-red PeLEDs by suppressing halide migration, inhibiting nonradiative recombination, and enlarging the bandgap.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Wei Shen, Jianbin Zhang, Ruimin Dong, Yanfeng Chen, Liu Yang, Shuo Chen, Zhan Su, Yujun Dai, Kun Cao, Lihui Liu, Shufen Chen, Wei Huang
Summary: By doping Ca2+ in alpha-CsPbI3 nanocrystals, the stability and optoelectronic properties of the material have been significantly improved, demonstrating the potential of Ca2+ doping strategy in high-quality CsPbI3 NC LEDs.
Article
Chemistry, Multidisciplinary
Shuxin Chen, Jidong Lin, Song Zheng, Yuanhui Zheng, Daqin Chen
Summary: High-quality backlit display requires color-converting materials. Metal halide perovskites (MHPs) with full spectral tunability and high color purity have shown potential in wide-color-gamut display. However, naked MHPs suffer from stability issues. In this study, amorphous-glass-protected CsPbX3 quantum dots (QDs) were prepared, which showed high photoluminescence quantum yields (PLQYs) and stability. The CsPbX3@glass QDs were used to construct white light-emitting diodes (wLEDs) and a prototype display device with vivid and wide-color-gamut features.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yushuai Xu, Hailong Wang, Yu Chen, Liang Chen, Zhiyuan Xie
Summary: In this study, oriented blue perovskite nanoplates were fabricated using an antisolvent additive engineering approach to increase grain sizes and crystallinity, leading to the successful fabrication of high-efficiency blue perovskite light-emitting diodes. The blue PeLEDs exhibited stable electroluminescent spectra and high brightness, with an emission peak at 488 nm and a maximum external quantum efficiency of 9.5%.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Wenlin Xia, Zhenwei Ren, Zhishuai Zheng, Chengzhao Luo, Jie Li, Wenchen Ma, Xin Zhou, Yu Chen
Summary: This study introduces small-sized rare earth La cations to improve the phase stability of CsPbI3 perovskite nanocrystals and achieve high emission efficiency in optoelectronic devices. The interaction between La and I ions in the CsPbI3 lattice effectively suppresses trap states and promotes radiative recombination, resulting in near-unity photoluminescence quantum yield. The La-doped nanocrystals also exhibit high energy bands, enabling efficient hole injection. The superior optoelectronic properties of La-doped CsPbI3 nanocrystals greatly enhance the performance of perovskite light-emitting diodes.
Article
Materials Science, Multidisciplinary
Ping Liu, Wanqing Cai, Cong Zhao, Siwei Zhang, Pengbo Nie, Wenzhan Xu, Hong Meng, Hongyan Fu, Guodan Wei
Summary: Remarkable progress has been made in perovskite light-emitting diodes (PeLEDs), with high-quality quasi-2D perovskite thin films successfully fabricated and efficient PeLEDs demonstrating high external quantum efficiencies (EQEs) and pure red emission peaks. These devices show good spectral and operational stability, indicating potential for display applications.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Yang Shen, Yan-Qing Li, Kai Zhang, Liu-Jiang Zhang, Feng-Ming Xie, Li Chen, Xiao-Yi Cai, Yu Lu, Hao Ren, Xingyu Gao, Haijiao Xie, Hongying Mao, Satoshi Kera, Jian-Xin Tang
Summary: Perovskite light-emitting diodes (PeLEDs) have potential in solution-processable display applications. However, the performance of blue PeLEDs is hindered by trap-mediated nonradiative recombination losses and halide phase segregation. Modulating mixed-halide perovskite materials through defect passivation can improve the performance of sky-blue PeLEDs, achieving high external quantum efficiency and stable emission.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Wenhao Bai, Mingming Liang, Tongtong Xuan, Ting Gong, Liang Bian, Huili Li, Rong-Jun Xie
Summary: By using L-glutathione reduced (GSH) as surface ligands, high-quality phenethylammonium tin iodide (PEA2SnI4) perovskite films were successfully constructed, leading to efficient pure red light-emitting diodes. This ligand engineering strategy effectively reduces the crystallization rate and suppresses the oxidation of Sn2+ ions, improving the film morphology and optical properties. The study demonstrates the feasibility of ligand engineering in enhancing the electroluminescence performance of Sn-based perovskite light-emitting diodes (PeLEDs).
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Feng Zhang, Xin Zhang, Chenhui Wang, Mengna Sun, Xiyu Luo, Yingguo Yang, Shuai Chang, Dongdong Zhang, Lian Duan
Summary: Alloyed perovskite nanocrystal films with optimized Cl distribution, fabricated using Cl-ligands, demonstrate superior blue EL emission performance in devices and greatly enhanced spectral stability compared to conventional Br-ligands.
Article
Chemistry, Physical
Gencai Pan, Xue Bai, Xinyu Shen, Lei Wang, Yanli Mao, Xu Chen, Wen Xu, He Shao, Donglei Zhou, Biao Dong, Lin Xu, Junhua Hu, Hongwei Song
Summary: A direct synthetic method for CsPbI3 nanorods was developed using YCl3 promotion, resulting in high-efficiency red emitting CsPbI3 NCs with small aspect ratio and improved performance. The YCl3-promoted CsPbI3 NRs showed promising prospects in optoelectronic devices, exhibiting excellent luminescence and conductivity in LED applications.
Article
Chemistry, Multidisciplinary
Mengqi Zhang, Chenghao Bi, Yuexing Xia, Xuejiao Sun, Xingyu Wang, Aqiang Liu, Shuyu Tian, Xinfeng Liu, Nora H. de Leeuw, Jianjun Tian
Summary: In this study, a water-driven synthesis strategy was used to obtain size-homogenized and strongly confined deep-blue CsPbBr3 quantum wells (QWs). The QWs exhibited remarkable stability and a high photoluminescence quantum yield of 94%. Light-emitting diodes based on the QWs achieved an external quantum efficiency of 1% and state-of-the-art brightness for perovskite QW-based LEDs.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Engineering, Environmental
Jie Tu, Jiaqi Ding, Guoqiang Xi, Hangren Li, Qianqian Yang, Jianjun Tian, Linxing Zhang
Summary: In this study, stable multifunctional multiferroic Bi0.5Sm0.5FeO3 (BSFO) double-perovskite epitaxial thin films were successfully synthesized by regulating the deposition temperature. The BSFO thin films exhibited robust ferroelectric polarization and excellent photoresponse, and its switchable ferroelectric photovoltaic feature demonstrated the potential for ferroelectric storage.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Wenxuan Du, Chunyan Cheng, Jianjun Tian
Summary: Doping a strong Lewis acid into a Lewis base polymer to form an acid-base adduct hole-transport layer can improve the efficiency of InP-based QLEDs.
Article
Chemistry, Inorganic & Nuclear
Jiaqi Ding, Hangren Li, Guoqiang Xi, Jie Tu, Jianjun Tian, Linxing Zhang
Summary: In this study, the researchers achieved increased tetragonality and reduced bandgaps in tetragonal-like phase BFO-based films through chemical strain. The tetragonality increased up to a large c/a of 1.239, and the bandgap decreased to 1.45 eV from 2.21 eV. This paper provides a new strategy for regulating the optical band gap of BFO and reveals its underlying mechanism.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Physical
Xiaomin Huo, Yaoyao Li, Wu Liu, Xiaofeng Huang, Juan Meng, Yao Lu, Ning Meng, Yu Zhang, Suling Zhao, Bo Qiao, Dong Wei, Dandan Song, Zheng Xu
Summary: In this study, a nonpolar material, didodecyldimethylammonium bromide (DDAB), was introduced as an interface material for improving the performance of wide-bandgap perovskite solar cells (WB-PSCs) by reducing surface defects and enhancing surface hydrophobicity. The modified WB-PSCs exhibited a champion power conversion efficiency (PCE) of 18.74%, compared to the standard device with a PCE of 16.50%. The stability of the devices under high humidity conditions was also significantly improved.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Jiuyao Du, Jifeng Yuan, Jiahao Xi, Fei Huang, Jianjun Tian
Summary: In this study, 1-ethyl-3-methylimidazolium acetate ([EMIM]Ac) ionic liquid was introduced to passivate the surface defects of perovskite films, improving the performance and stability of metal halide perovskite solar cells. The carbonyl groups of [EMIM]Ac coordinate with the uncoordinated lead ions on the perovskite surface, reducing nonradiative recombination and improving working stability. The power conversion efficiency of the solar cell increased from 16.95% to 19.29% with [EMIM]Ac treatment. This surface passivation method using an ionic liquid may have significant implications for the development and practical application of perovskite solar cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Jifeng Yuan, Jianjun Tian
Summary: Researchers have developed an in-situ ligand exchange strategy to improve the surface chemistry of CsPbI3 quantum dots, resulting in higher power conversion efficiency and long-term durability.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Huitian Li, Liuyi Xiong, Jinwei Li, Yao Lu, Zhaohui Shen, Dandan Song, Suling Zhao, Zheng Xu, Zhiqin Liang, Bo Qiao
Summary: In this article, the lattice strain in perovskite nanocrystals was regulated by the ratio of Cs+, EA(+), and Rb+ cations with different sizes. Their electrical structure, formation energy, and ion migration activation energy were calculated with the density functional theory (DFT) method. The luminescence properties and stability of blue lead bromide perovskite nanocrystals were analyzed with spectra regulation from 516 to 472 nm. It was demonstrated that the lattice strain plays an important role in the luminescence performance and degradation process of perovskite materials. The study provides the positive correlation between lattice strain and degradation as well as luminescence properties in lead halide perovskite materials, which is of great importance in uncovering their degradation mechanisms and developing stable and high-performance blue perovskite materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Aqiang Liu, Chenghao Bi, Jing Li, Mengqi Zhang, Chunyan Cheng, David Binks, Jianjun Tian
Summary: Here, an in situ photoluminescence (PL) system was developed to monitor the nucleation and growth of perovskite nanocrystals and achieve highly confined and monodispersed quantum dots (QDs) with an average size of 3.4 nm. Pure-blue (460 nm wavelength) CsPbBr3 QDs with near unity PL quantum yield and a narrow size distribution (small size dispersion of 9.6%) were produced. Light-emitting diodes (LEDs) based on these QDs showed narrow electroluminescence with a full width at half-maximum of 20 nm and a high color purity of 97.3%. The LEDs also exhibited a high external quantum efficiency of 10.1%, maximum luminance of 11,610 cd m-2, and a continuous operation lifetime of 21 h at the initial luminance of 102 cd m-2, which represents the state-of-the-art for pure-blue perovskite LEDs.
Article
Nanoscience & Nanotechnology
Mengli Hu, Yu Zhang, Ning Meng, Wei Wang, Yao Lu, Jie Dong, Suling Zhao, Bo Qiao, Dandan Song, Zheng Xu
Summary: This study proposes a method to modulate the phase distribution of quasi-two-dimensional (quasi-2D) perovskite using a Dion-Jacobson (DJ)-type organic spacer. By introducing a DJ-type organic spacer cation, 1.6-hexamethylenediamine (HDABr2), as the second spacer cation with propylamine hydrobromide (PABr), the crystallization of the quasi-2D perovskite is modulated and the phase distribution is narrowed. This method significantly improves the performance of quasi-2D perovskite LEDs in terms of maximum luminance, current efficiency, external quantum efficiency, and device stability.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Zhuoping He, Qianqian Yang, Guoqiang Xi, Jie Tu, Jianjun Tian, Linxing Zhang
Summary: The first measurement of ferroelectric hysteresis loop in pure anatase-phase titanium dioxide was reported, demonstrating ferroelectric-like behavior in a-TiO2 epitaxial thin films prepared by chemical solution deposition method. The quality of epitaxial films was confirmed by synchrotron based X-ray diffraction and reciprocal space mapping. The results showed that the polarization of a-TiO2 film with a thickness of 14.5 nm could reach approximately 0.42 mu C/cm2. Atomic force microscopy (PFM) revealed ferroelectric-like behavior in the 7.5 nm a-TiO2 film, with the PFM polarization switch maintained for over 100 minutes. The origin of this behavior is attributed to strain and vacancy-induced distortion, while the electrochemical effect has a significant influence on the intrinsic ferroelectric performance.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Ceramics
Xinrui Cheng, Guoqiang Xi, Yue-Wen Fang, JiaQi Ding, Jianjun Tian, Linxing Zhang
Summary: Polarization and optical properties of BiFeO3-based ferroelectric films are regulated by both chemical composition and interlayer design. The improvement of ferroelectricity and bandgap is achieved through these methods. The remanent polarization is enhanced from 0.2 mu C/cm2 to 73.8 mu C/cm2 and the band gap is reduced from 2.42 eV to 2.23 eV. The optimal films show improved polarization and band gap, with a short-circuit current density of 89.0 nA and open circuit voltage of 0.412 V.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Multidisciplinary Sciences
Qianqian Yang, Jingcong Hu, Yue-Wen Fang, Yueyang Jia, Rui Yang, Shiqing Deng, Yue Lu, Oswaldo Dieguez, Longlong Fan, Dongxing Zheng, Xixiang Zhang, Yongqi Dong, Zhenlin Luo, Zhen Wang, Huanhua Wang, Manling Sui, Xianran Xing, Jun Chen, Jianjun Tian, Linxing Zhang
Summary: We developed a bismuth oxide film with a layered structure that can stabilize the ferroelectric state at a thickness of 1 nanometer. The film can be grown on different substrates using a cost-effective chemical solution deposition technique. The thin films, ranging from 1 to 4.56 nanometers, exhibited a standard ferroelectric hysteresis loop and relatively large remanent polarization. First-principles calculations confirmed the film's structure and suggested it to be a lone pair-driven ferroelectric material. The design of ultrathin ferroelectric films holds great potential for atomic-scale electronic device manufacturing.
Article
Chemistry, Physical
Haochen Shi, Yingjie Li, Suling Zhao, Bo Qiao, Zhiqin Liang, Honge Zhao, Zheng Xu, Dandan Song
Summary: In this article, machine learning algorithms are used to predict the energy levels of TADF materials by establishing the relationships between molecular structure and energy levels. The models show low error and high accuracy, especially in predicting HOMO energy levels. The results of this study are valuable for material design.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
