Article
Multidisciplinary Sciences
Feng Ke, Chenxu Wang, Chunjing Jia, Nathan R. Wolf, Jiejuan Yan, Shanyuan Niu, Thomas P. Devereaux, Hemamala I. Karunadasa, Wendy L. Mao, Yu Lin
Summary: By manipulating the stability of inorganic lead halide perovskites through high pressure treatment and structural deformation induced at high pressure, the authors have synthesized a CsPbI3 perovskite phase that is preserved at ambient conditions, potentially enhancing material functionality.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Yuxuan Li, Yaoyao Han, Wenfei Liang, Boyu Zhang, Yulu Li, Yuan Liu, Yupeng Yang, Kaifeng Wu, Jingyi Zhu
Summary: By controlling the light helicity, the researchers observed spin-selective Bloch-Siegert shift in CsPbI3 perovskite quantum dots, which was accompanied by a higher ratio between the Bloch-Siegert and optical Stark shifts than predicted by the non-interacting model. The experimental observations were quantitatively reproduced using a model that explicitly accounted for excitonic effects, suggesting the importance of many-body interactions in correctly modeling the shift. These findings provide a basis for implementing these effects in information processing, optical modulation, and Floquet engineering.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Xian Wang, Dayujia Huo, Xin Wang, Minjie Li, Yong Wang, Yan Wan
Summary: The photophysical properties of surface passivated CsPbI3 perovskite were investigated using transient absorption spectroscopy. The results showed that surface passivation slowed down carrier trapping and accelerated bimolecular recombination, leading to improved carrier transport and longer hot carrier lifetime. Defect passivation was found beneficial for enhancing defect tolerance and slowing down hot carrier cooling in developing high-performance photovoltaics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(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.
Article
Chemistry, Physical
Zhangben Dai, Junsheng Chen, Bin Yang
Summary: A series of Yb2+-alloyed CsPbI3 perovskite nanocrystals were synthesized, showing pure-red emission with enhanced air and thermal stability, and ultrafast hot-carrier cooling processes, which suggest great potential for high-performance pure-red light-emitting diodes.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Yongsheng Zhu, Jun Zhao, Xueguo Li, Xiumei Xu, Jinshu Huang, Xiaoxu Ji, Gang Yang, Gencai Pan
Summary: Efficient inert shell-modified NaYF4:Yb/Tm@NaYF4 upconversion nanoparticles (UCNPs) and CsPbI3 perovskite quantum dots (PQDs) were successfully synthesized with the assistance of (3-aminopropyl)-triethoxysilane (APTES) for a SiO2 matrix. The composites showed dual-wavelength excitation characteristics and dual-mode anticounterfeiting application, highlighting the potential of perovskite-based multifunctional materials.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Zhaohui Shen, Chenghao Bi, Yao Lu, Dandan Song, Bo Qiao, Suling Zhao, Jianjun Tian, Zheng Xu
Summary: Stable cross-shaped CsPbI3 nanoplates with red emission were successfully synthesized by the assistance of YCl3. The anisotropic growth of the CsPbI3 nanocrystal and the dissolution of four corners lead to the formation of cross-shaped nanoplates. The incorporation of Y3+ dopant widens the bandgap and enhances the stability of the nanoplates. These adjustable wavelength and highly stable nanoplates show great potential in high-definition displays.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Chuying Wang, Wen Meng, Yacong Li, Guangyong Xu, Min Peng, Shuming Nie, Zhengtao Deng
Summary: In this study, a novel colloidal synthesis route was reported using lauryl methacrylate (LMA) as the reaction solvent to improve the solubility of precursors, resulting in small-sized alpha-CsPbI3 QDs with a diameter of only 4.2 nm. These QDs exhibited a tunable photoluminescence emission peak in the bright pure red region of 627 to 638 nm. This research provides a high-performance pure red fluorescent material with a robust, low-cost, and reproducible colloidal chemistry for the adoption of perovskite QDs in display backlight application.
Article
Chemistry, Physical
Sumanta Paul, Anunay Samanta
Summary: By adding NH4I as a precursor, stable and highly luminescent CsPbI3 nanocrystals were successfully synthesized in this study, with significantly suppressed PL blinking. These CsPbI3 nanocrystals can be used as promising materials for single-photon emitters and optoelectronic and solar photovoltaic applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Yanfeng Miao, Xiaomin Liu, Yuetian Chen, Taiyang Zhang, Tianfu Wang, Yixin Zhao
Summary: Introducing diammonium iodide can improve the preparation process of CsPbI3, slowing down the phase-transition rate and passivating trap states, thereby increasing the external quantum efficiency of PeLEDs. PeLEDs prepared by this method have high conductivity and reduced trap states, and have a wide processing window suitable for rapid production of large-area PeLED modules.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jianru Wang, Cuimiao Zhang, Shuang Li, Qile Guo, Yunyu Bai, Guang Jia
Summary: Doping nickel ions into CsPbI3 PQDs enhances their luminescence performance and stability, opening up possibilities for their use in optoelectronic devices.
Review
Materials Science, Multidisciplinary
Xue Tan, Shubin Wang, Qixian Zhang, Huicong Liu, Weiping Li, Liqun Zhu, Haining Chen
Summary: This review discusses the strategies and progress in stabilizing the CsPbI3 perovskite structure and improving the stability of CsPbI3 perovskite solar cells. It covers topics such as ionic incorporation, regulating surface energy, incorporating low-dimensional perovskites, and surface termination. The challenges and opportunities of all-inorganic CsPbI3 perovskite are also briefly mentioned.
Article
Chemistry, Multidisciplinary
Wasim J. Mir, Ahmed Alamoudi, Jun Yin, Khursand E. Yorov, Partha Maity, Rounak Naphade, Bingyao Shao, Jiayi Wang, Muhammad Naufal Lintangpradipto, Saidkhodzha Nematulloev, Abdul-Hamid Emwas, Alessandro Genovese, Omar F. Mohammed, Osman M. Bakr
Summary: The use of zwitterionic lecithin ligands can stabilize the perovskite phase of CsPbI3 QDs for long periods, allowing LEDs fabricated with them to achieve record-breaking efficiency and brightness in the Rec. 2020 standard.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Optics
Xin Zhou, Xuan Tong, Xiaolong Li, Yonggang Min, Yannan Qian
Summary: The combination of indium doping and chlorine surface passivation in deep-red CsPbI3 perovskite quantum dots leads to improved color purity and photoluminescence quantum yield, resulting in higher luminance and external quantum efficiency in perovskite light-emitting diodes.
Article
Engineering, Environmental
Tiantian Wang, Xiansheng Li, Tao Fang, Shalong Wang, Jizhong Song
Summary: A ligand-mediated strategy was proposed to synthesize gamma-phase CsPbI3 perovskite NCs in non-polar solvent at room temperature for the first time. This method showed superior universality as evidenced by the successful synthesis of efficient red-green-blue CsPbX3 NCs, indicating that room-temperature synthesis could avoid the tediousness of typical hot-injection at high temperatures.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
N. S. M. Viswanath, Mu-Huai Fang, Ha Tran Huu, Joo Hyeong Han, Ru-Shi Liu, Won Bin Im
Summary: This study demonstrates the tuning of thermal stability from negative thermal quenching to zero thermal quenching while preserving the original emission efficiency by introducing Lu3+ ions in Na3Sc2(PO4)(3):Eu2+. By utilizing optimized Lu3+-doped Na3Sc2(PO4)3:Eu2+ as the blue component, a high-power white light-emitting diode with high color-rendering index and luminous efficiency values was successfully fabricated. These findings emphasize the importance of structure-property relationships in designing thermally stable phosphors for high-power lighting applications.
CHEMISTRY OF MATERIALS
(2022)
Article
Energy & Fuels
Ha Tran Huu, Hang T. T. Le, Thanh Huong Nguyen, Lan Nguyen Thi, Vien Vo, Won Bin Im
Summary: In this study, SnS2 nanosheets were synthesized and grafted onto porous g-C3N4 as an anode active material for sodium-ion batteries. The composites showed outstanding performance in terms of high capacity and ultralong cycling stability, attributed to the presence of g-C3N4 relieving strains induced by volume variation of SnS2 and enhanced transport of electrons and sodium ions.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Materials Science, Ceramics
Yoon Sung Jung, Kyung Won Min, Jae Ho Choi, Ji Sob Yoon, Won Bin Im, Hyeong-Jun Kim
Summary: The etch rate of CAS glass layers increased with increasing temperature and duration, leading to reduced plasma resistance as well as increased crystallization of the glass layers.
JOURNAL OF THE KOREAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Ha Jun Kim, Sangyoon Ji, Ju Yeon Han, Han Bin Cho, Young-Geun Park, Dongwhi Choi, Hoonsung Cho, Jang-Ung Park, Won Bin Im
Summary: Cracked tooth syndrome (CTS) is a common incomplete fracture of human teeth caused by chewing hard foods, and it is often difficult to diagnose accurately using conventional techniques. A novel method using mechanoluminescence phenomenon and phosphor particles has been developed for in vivo detection of tooth microcracks, providing high-resolution imaging of cracks through a stretchable and self-healable photodetector array. This technique utilizes a simple optical phenomenon to obtain precise information about the locations, depth, and length of tooth cracks, distinguishing it from traditional methods.
NPG ASIA MATERIALS
(2022)
Article
Chemistry, Physical
Joo Hyeong Han, N. S. M. Viswanath, Yong Min Park, Han Bin Cho, Sung Woo Jang, Jeong Wan Min, Won Bin Im
Summary: Mn2+-activated metal halide perovskites possess remarkable optical properties but suffer from low photoluminescence quantum yield and weak thermal stability. Developing Mn2+-activated metal halide perovskites with high photoluminescence quantum yield and good thermal stability is a highly versatile research area to meet current needs.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Changhee Jang, Kangyong Kim, Hak-Won Nho, Seung Min Lee, Hanif Mubarok, Joo Hyeong Han, Hyeonjung Kim, Dongryeol Lee, Yangpil Jang, Min Hyung Lee, Oh-Hoon Kwon, Sang Kyu Kwak, Won Bin Im, Myoung Hoon Song, Jongnam Park
Summary: This article presents an optimized colloidal process for synthesizing uniform Cs5Cu3Cl6I2 nanocrystals with a superior quantum yield. Precise control of the synthesis parameters enables anisotropic growth and emission wavelength shifting. The synthesized nanocrystals exhibit excellent photoluminescence retention rate at high temperature and high stability under ambient conditions. Moreover, they demonstrate three-photon absorption-induced photoluminescence, indicating their potential for nonlinear optical applications. These thermally stable and highly luminescent nanocrystals overcome the limitations of conventional blue-emitting nanomaterials and provide insights into their colloidal synthesis mechanism.
Article
Materials Science, Multidisciplinary
Jinju Lee, Hansol Lee, Usik Kim, Woon Jin Chung, Won Bin Im
Summary: A remote color converter was fabricated using CsPbBr3 perovskite nanocrystal embedded glass (PNEG) as a green phosphor in a silicone (PiS) structure. The PNEG, when pasted on a glass substrate and mounted on a blue LED, exhibited enhanced thermal and photo stability compared to bulk PNEG. A white LED with a wide color gamut of up to 130% of the NTSC defined area was prepared using the remote color converter and K2SiF6:Mn4+ (KSF:Mn4+) as a red phosphor. The feasibility of a flexible remote white color converter using ultra-thin glass (UTG) as a substrate was also examined and discussed.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Joo Hyeong Han, Tuhin Samanta, Yong Min Park, Ha Jun Kim, Noolu Srinivasa Manikanta Viswanath, Hyeon Woo Kim, Bo Kyung Cha, Sung Beom Cho, Won Bin Im
Summary: We developed zero-dimensional lead-free monoclinic phases of Cs3TbCl6 and Rb3TbCl6 metal halides that are thermally and chemically stable. These materials exhibit high light yields and low detection limits, making them suitable for radiation detection in extreme environments. Thin films of Cs3TbCl6 and Rb3TbCl6 also show improved spatial resolutions compared to a commercial Gd2O2S:Tb3+ film in our X-ray imaging system.
ACS ENERGY LETTERS
(2023)
Article
Engineering, Chemical
Kyung Won Min, Jae Ho Choi, YoonSung Jung, Young Min Byun, Won Bin Im, Hyeong-Jun Kim
Summary: This study investigated the effects of heat-treatment temperature and hot-end coating on the mechanical properties and reliability of lightweight glass bottles. Chemical strengthening at the glass transformation temperature significantly improved the hardness and impact strength of the bottles. The use of hot-end coating reduced the distribution of impact strength and increased the Weibull modulus values, enhancing the reliability of the bottles after chemical strengthening.
Article
Nanoscience & Nanotechnology
Han Bin Cho, Ju Yeon Han, Ha Jun Kim, Noolu Srinivasa Manikanta Viswanath, Yong Min Park, Jeong Wan Min, Sung Woo Jang, Heesun Yang, Won Bin Im
Summary: Quantum dot light-emitting diodes (QLEDs) are promising for display applications. Polyethylenedioxythiophene:polystyrene sulfonate (PEDOT:PSS) is commonly used as a hole injection layer (HIL) material due to its high conductivity and work function. However, PEDOT:PSS-based QLEDs have a high energy barrier for hole injection, resulting in low device efficiency. Here, we demonstrate a bilayer-HIL using VO2 and a PEDOT:PSS-based QLED, which shows an 18% external quantum efficiency (EQE), 78 cd/A current efficiency (CE), and 25,771 cd/m(2) maximum luminance. This is compared to the PEDOT:PSS-based QLED with an EQE of 13%, CE of 54 cd/A, and maximum luminance of 14,817 cd/m(2). The increase in EQE is attributed to the reduction in the energy barrier between indium tin oxide (ITO) and PEDOT:PSS by the insertion of a VO(2) HIL. Therefore, our results demonstrate the effectiveness of a bilayer-HIL in increasing the EQE in QLEDs.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Tuhin Samanta, Noolu Srinivasa Manikanta Viswanath, Sung Woo Jang, Jeong Wan Min, Han Bin Cho, Joo Hyeong Han, Won Bin Im
Summary: Researchers report zero-dimensional Cs3ScCl6:Sb3+(CSC:Sb3+) nanocrystals that exhibit bright white-light emission, achieved through the combination of blue and yellow emissions of carbon dots and spin-forbidden electronic transitions of Sb3+ ions. These nanocrystals have a high photoluminescence quantum yield and high thermal stability, and can be used to fabricate single-component white-light-emitting diodes.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Joo Hyeong Han, Tuhin Samanta, Han Bin Cho, Sung Woo Jang, N. S. M. Viswanath, Yu Ri Kim, Jeong Min Seo, Won Bin Im
Summary: This study presents a new Cs3GdCl6 0D metal halide material that shows high hydrochromic upconversion luminescence (UCL) in the form of polycrystals and nanocrystals. The hydrochromic UCL color change from green to red is achieved through co-doping Yb3+ and Er3+ in polycrystals. The water-sensing probe based on this material exhibits excellent repeatability and is suitable for real-time and long-term water monitoring. Moreover, the hydrochromic UCL property is also utilized for stimuli-responsive information encryption.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Hyeon Woo Kim, Joo Hyeong Han, Hyunseok Ko, Tuhin Samanta, Dong Geon Lee, Dong Won Jeon, Woongchan Kim, Yong-Chae Chung, Won Bin Im, Sung Beom Cho
Summary: Exploring the vast and veiled chemical spaces through synthesis is crucial in solid-state materials. This study focuses on navigating metal halides, particularly the coexistence of perovskites and their derivatives, which has restricted their exploration. By combining high-throughput density functional theory calculations and machine learning, the researchers systematically explore inorganic halide perovskite derivatives, charting the chemical spaces and predicting their electrical properties and thermal stability. The successful synthesis of new Cs3LuCl6 and its application in white-light-emitting diodes showcase the potential practical applications of inorganic metal halides.
ACS ENERGY LETTERS
(2023)
Review
Engineering, Electrical & Electronic
Han Bin Cho, Jeong Wan Min, Ha Jun Kim, Noolu Srinivasa Manikanta Viswanath, Tuhin Samanta, Joo Hyeong Han, Yong Min Park, Sung Woo Jang, Won Bin Im
Summary: Zero-dimensional (0D) perovskites have attracted significant attention in optoelectronic applications due to their unique structure and optical properties. This review discusses the synthesis methods and phase stability issues of three-dimensional embedded in zero-dimensional (3D-0D) lead halide perovskites, as well as their various applications in optoelectronic devices. Future research directions are also suggested based on their potential applications.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Zhongkai Yu, Woo Hyeon Jeong, Keehoon Kang, Hochan Song, Xinyu Shen, Hyungju Ahn, Seok Woo Lee, Xiangyang Fan, Ji Won Jang, Su Ryong Ha, Jeong Wan Min, Jong Hyun Park, Jongmin Han, Eui Dae Jung, Myoung Hoon Song, Dong Wook Chang, Won Bin Im, Sung Heum Park, Hyosung Choi, Bo Ram Lee
Summary: Metal halide based perovskite light-emitting diodes (PeLEDs) show great promise for future commercial display products, but the performance of blue PeLEDs falls short of commercial requirements. This study developed a polymer/small-molecule binary-blend hole transport layer (HTL) to address the charge balance issue and achieve efficient light emission.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)