Article
Materials Science, Multidisciplinary
Jutao Jiang, Guangming Niu, Laizhi Sui, Xiaowei Wang, Xiangyu Zeng, Yutong Zhang, Li Che, Guorong Wu, Kaijun Yuan, Xueming Yang
Summary: This study reports an all-inorganic lead-free Cs2TeCl6 perovskite crystal that exhibits three- to six-photon absorption effects over a wavelength range of 800-2200 nm. The results indicate that the broadband orange emission in the crystal is attributed to the recombination of self-trapped excitons.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Andrea Erroi, Sara Mecca, Matteo L. Zaffalon, Isabel Frank, Francesco Carulli, Alessia Cemmi, Ilaria Di Sarcina, Doriana Debellis, Francesca Rossi, Francesca Cova, Kristof Pauwels, Michele Mauri, Jacopo Perego, Valerio Pinchetti, Angiolina Comotti, Francesco Meinardi, Anna Vedda, Etiennette Auffray, Luca Beverina, Sergio Brovelli
Summary: The researchers have successfully synthesized large polyacrylate nanocomposite scintillators based on CsPbBr3 nanocrystals. The scintillators show high luminescence efficiency, exceptional radiation hardness, and ultrafast response time, making them suitable for fast-time applications in precision medicine and high-energy physics. By using pulsed synchrotron light, the origin of the scintillation kinetics is further clarified.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Maning Liu, Sri Kasi Matta, Harri Ali-Loytty, Anastasia Matuhina, G. Krishnamurthy Grandhi, Kimmo Lahtonen, Salvy P. Russo, Paola Vivo
Summary: This study presents a method for the synthesis of lead-free Cs4CuIn2Cl12 nanocrystals through moisture-assisted approach, showing advantages in PL quantum yield, morphology, and photoluminescence properties. It paves the way for further research on novel lead-free halide perovskite nanocrystals for various applications.
Article
Chemistry, Physical
Dushyant Kushavah, Aamir Mushtaq, Suman Kalyan Pal
Summary: Two-dimensional inorganic halide nanomaterials have attracted tremendous attention due to their simple synthesis, solution processability, superior electronic, optical, and mechanical properties, as well as versatile applications. Inorganic dual phase perovskite composites may exhibit superior optoelectronic properties compared to single phase materials, and doping with various ions can lead to emerging applications. In this study, we report the synthesis of colloidal 2D Mo-doped all inorganic dual phase mixed halide perovskite and investigate the charge carrier dynamics using femtosecond transient absorption technique. Our results reveal that carrier trapping and Auger recombination dominate the carrier relaxation at different energy densities. Additionally, femtosecond Z-scan studies elucidate the effect of photoinduced charge carriers on two photon absorption properties. These findings can contribute to the design of new low-dimensional perovskites for future optoelectronic applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Optics
Ruiling Zhang, Xin Xu, Xin Mao, Zhongyi Wang, Pengyuan Wang, Yang Yang, Junsheng Chen, Ruifeng Lu, Weiqiao Deng, Keli Han
Summary: This work reports a new all-inorganic zero-dimensional rare-earth perovskite material that exhibits tunable emission colors from blue-green to white to yellow at room temperature by controlling the excitation wavelength, and enhances the quantum yield of yellow emission by doping Sb3+ ions. The study not only presents a new type of light-emitting material, but also provides a strategy for the design of non-toxic and high-performance light-emitting materials.
LASER & PHOTONICS REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Xiaoyu Huang, Yoshitaka Matsushita, Hong-Tao Sun, Naoto Shirahata
Summary: Lead-free double-perovskite nanocrystals (NCs) have shown great potential for environmentally friendly optical applications due to their physical stability. This study investigated the photophysical properties of Cs2Ag0.65Na0.35InCl6 NCs doped with bismuth (Bi3+) ions and found that the photoluminescence quantum yield (PLQY) increased and the optical bandgap decreased with Bi-doping. The study also revealed that the presence of bismuth suppressed the decrease of PL intensity with increasing temperature and alleviated the thermal quenching effect.
NANOSCALE ADVANCES
(2022)
Article
Materials Science, Multidisciplinary
Razi Ahmad, Lukas Zdrazil, Sergii Kalytchuk, Alberto Naldoni, Elmira Mohammadi, Patrik Schmuki, Radek Zboril, Stepan Kment
Summary: Bismuth-doped alloyed Cs2Ag1-xNaxInCl6 double perovskite nanocrystals with high photoluminescence quantum yield and long-term stability were successfully synthesized and purified. The optimized bismuth-doping produced warm white-light emission with a photoluminescence quantum yield of 40%. The synthesis of highly emissive and stable DP NCs was achieved by utilizing a combination of silver-trioctylphosphine complex and TOP ligand.
APPLIED MATERIALS TODAY
(2022)
Article
Chemistry, Multidisciplinary
Muyu Cong, Qingkai Zhang, Bin Yang, Junsheng Chen, Jie Xiao, Daoyuan Zheng, Tiancheng Zheng, Ruiling Zhang, Guangyan Qing, Chunfeng Zhang, Ke-li Han
Summary: This study presents a design principle to enhance the photoluminescence of triplet excitons in all-inorganic lead-free double-perovskite nanocrystals. Experimental data show that this design approach results in bright green emission and efficient white-light emitting through energy transfer to dopants.
Article
Optics
Hongyuan Zhao, Youchao Wei, Yameng Chen, Caiping Liu, Feilong Jiang, Yongsheng Liu, Maochun Hong
Summary: This article describes a modified hot-injection method for preparing pure-blue and sky-blue emitting 0D Cs3ZnX5 perovskite nanocrystals with excellent stability. Experimental results and first-principles calculations confirm that the blue emissions are dominated by halide vacancies in the perovskite structure.
JOURNAL OF LUMINESCENCE
(2022)
Article
Optics
Bin Yang, Tianxin Bai, Junsheng Chen, Xiaochen Wang, Zhe Tang, Hang Yin, Donghui Wei, Songqiu Yang, Keli Han
Summary: This study investigates the introduction of antimony (Sb) into 2D double-perovskites to change self-trapped excitons from dark to bright states. The research shows that the introduction of Sb reduces the carrier-phonon coupling strength, allowing for efficient separation and collection of charge-carriers. Photodetectors based on the modified material exhibit significantly higher responsivity and external quantum efficiency compared to those based on traditional 2D double-perovskites. This study presents a unique strategy for developing high-performance optoelectronic devices utilizing self-trapped excitons.
LASER & PHOTONICS REVIEWS
(2022)
Article
Chemistry, Physical
G. Krishnamurthy Grandhi, Rakesh Dhama, Noolu Srinivasa Manikanta Viswanath, Ekaterina S. Lisitsyna, Basheer Al-Anesi, Jayanta Dana, Vipinraj Sugathan, Humeyra Caglayan, Paola Vivo
Summary: The perovskite-inspired Cu2AgBiI6 (CABI) absorber holds potential for low toxicity indoor photovoltaics. However, the self-trapping of carriers in CABI reduces its photovoltaic performance. Through the analysis of the excited-state dynamics of CABI, it is found that photoexcitation in CABI leads to the formation and luminescence of self-trapped states. The understanding of this self-trapping phenomenon is crucial for optimizing the optoelectronic properties of CABI and can be achieved through compositional engineering.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Wenjie Ma, Huaxin Wu, Xiaoyu Liu, Ruonan Miao, Tianyuan Liang, Jiyang Fan
Summary: In this study, the photodynamic properties of cadmium-based double perovskite nanoparticles were investigated using both experimental and density functional theory calculations. The results revealed that the alloying of the nanoparticles significantly influenced their photoluminescence, with the substitution of certain atoms leading to crystal symmetry breaking and enhanced exciton localization. This study provides important insights into the photophysics of perovskite nanocrystals and their potential applications in solid-state lighting.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Gangyi Zhang, Deyin Wang, Bibo Lou, Chong-Geng Ma, Andries Meijerink, Yuhua Wang
Summary: An all-inorganic bismuth halide perovskite Cs2AgBiCl6 single crystal is reported to achieve efficient broadband NIR emission by introducing Na ions. The NIR emission originates from self-trapped excitons (STE) emission, which can be enhanced by weakening the strong coupling between electrons and phonons.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Nanoscience & Nanotechnology
Buyang Yu, Chunfeng Zhang, Lan Chen, Zhengyuan Qin, Xinyu Huang, Xiaoyong Wang, Min Xiao
Summary: Perovskite semiconductor nanocrystals have shown great potential in optoelectronic applications, and their performances rely on the excited-state dynamics, with recent studies focusing on photoinduced carrier dynamics, spin dynamics, and coherent exciton dynamics. Future research should aim to address controversial results and unresolved origins to fully understand the excited-state dynamics.
Review
Nanoscience & Nanotechnology
Buyang Yu, Chunfeng Zhang, Lan Chen, Zhengyuan Qin, Xinyu Huang, Xiaoyong Wang, Min Xiao
Summary: Perovskite semiconductor nanocrystals have shown promise in optoelectronic applications, with recent research focusing on their photoinduced carrier dynamics. The dynamics of carrier generation, recombination, and transport play essential roles in the performance of devices such as light-emitting diodes and solar cells. Spin dynamics and coherent exciton dynamics are important for potential applications in quantum information technology, though there are still controversial results and unresolved origins to be addressed.
Article
Chemistry, Analytical
Yan Jia, Yiying Wang, Yongli Zhang, Jiayue Wang, Yanxi Pei, Zhiqing Wang, Peng Li, Keli Han
Summary: The study developed novel fluorescent probes CBLP and CSEP for effective monitoring of cystathionine lyase activity, providing a new approach for the analysis of cystathionine lyase in biological processes.
ANALYTICAL CHEMISTRY
(2022)
Article
Optics
Siping Liu, Bin Yang, Junsheng Chen, Daoyuan Zheng, Zhe Tang, Weiqiao Deng, Keli Han
Summary: This study presents the colloidal synthesis of lead-free vacancy-ordered Cs2HfCl6 perovskite NCs using hafnium acetylacetonate as metal precursors and proposes a passivation strategy for sub-bandgap trap states by doping Sb3+ ions. Additionally, the introduction of lanthanide ions enables tunable multicolor emissions in Cs2HfCl6 NCs, providing effective strategies for tuning the optical properties of lead-free vacancy-ordered perovskite NCs.
LASER & PHOTONICS REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Xiaochen Wang, Tianxin Bai, Bin Yang, Ruiling Zhang, Daoyuan Zheng, Junke Jiang, Shuxia Tao, Feng Liu, Ke-li Han
Summary: The study introduces all-inorganic germanium salts, GeX4, as robust and less hazardous alternatives for improving the material properties of both Pb-based and Pb-free PNCs. GeX4 does not introduce the Ge element into the final nanocrystals, resulting in significantly improved photoluminescence quantum yield and phase stability. Theoretical calculations suggest that Ge halide precursors provide favorable conditions for the formation of defect-suppressed nanoparticles.
Article
Materials Science, Multidisciplinary
Peigeng Han, Wei Zhou, Daoyuan Zheng, Xirui Zhang, Cheng Li, Qingkun Kong, Songqiu Yang, Ruifeng Lu, Keli Han
Summary: This study introduced a new type of lead-free halide perovskite variant nanocrystals, with Sb-doped NCs exhibiting green emission and showing higher photoluminescence quantum efficiency and better stability. Additionally, In-based perovskite variant NCs containing coordinated water were successfully synthesized, achieving a high PLQE for Sb-doped Cs2InCl5(H2O) NCs. The emission mechanism was further elucidated using temperature-dependent PL and femtosecond transient absorption techniques.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Fangjian Shang, Runze Liu, Meiheng Lv, Yinhua Ma, Jianyong Liu, Panwang Zhou, Chaoyang Zhang, Ke-li Han
Summary: This study reveals the synthesis mechanism of hexanitrohexaazaisowurtzitane (CL-20) through theoretical calculations and discovers the role of the benzyl group in reducing energy barriers and increasing yield.
Article
Nanoscience & Nanotechnology
Xiaochen Wang, Tianxin Bai, Xuan Meng, Sujun Ji, Ruiling Zhang, Daoyuan Zheng, Bin Yang, Junke Jiang, Ke-li Han, Feng Liu
Summary: This study successfully synthesized efficient blue emitters by optimizing the synthesis process and proposed new materials design strategies.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Zhongyi Wang, Ruiling Zhang, Xin Mao, Daoyuan Zheng, Siping Liu, Feng Liu, Keli Han, Bin Yang
Summary: The synthesis and photophysics of yttrium-based double perovskite single crystals and nanocrystals are reported. The emission of pristine single crystals is weak, while it is greatly enhanced after Sb3+ doping. The optimized doped samples exhibit high photoluminescence quantum yields.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Xin Mao, Zhongyi Wang, Fen Zhang, Hong Yin, Xin Xu, Junsheng Chen, Zhen Chen, Junhua Luo, Keli Han, Ruiling Zhang
Summary: In this paper, the synthesis and photophysical properties of high-quality Sb3+-doped 0D Rb2ScCl5(H2O) perovskite single crystals are reported. It is found that the emission quantum yield can be dramatically enhanced from less than 1% to about 53% via Sb3+ doping. Spectroscopic characterizations indicate that the photoluminescence enhancement is a result of the efficient energy transfer from Sb3+ to the emissive self-trapped excitons. Additionally, 0.2%Sb3+:Rb2ScCl5(H2O) single crystals exhibit potential application in direct X-ray detection with a high sensitivity of 58.5 mu C Gy-1 cm-2.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Xin Mao, Zhongyi Wang, Fen Zhang, Hong Yin, Xin Xu, Junsheng Chen, Zhen Chen, Junhua Luo, Keli Han, Ruiling Zhang
Summary: In this study, high-quality Sb3+-doped 0D Rb2ScCl5(H2O) perovskite single crystals were synthesized and their photophysical properties were investigated. The introduction of Sb3+ dramatically enhanced the emission quantum yield from less than 1% to about 53%. Spectroscopic characterizations revealed that the enhancement was attributed to efficient energy transfer from Sb3+ to the emissive self-trapped excitons (STE). Moreover, 0.2%Sb3+:Rb2ScCl5(H2O) single crystals showed potential applications in direct X-ray detection with a high sensitivity of 58.5 mu C Gy(-1) cm(-2).
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Review
Materials Science, Multidisciplinary
Pengfei Cheng, Keli Han, Junsheng Chen
Summary: Metal halide perovskites, with their excellent photophysical properties, have attracted extensive attention in the field of photocatalysis. However, the toxicity and instability issues of conventional lead-based perovskites limit their application prospects. The rapid development of lead-free halide perovskites (LFHPs) provides new opportunities for photocatalysis. This Review summarizes the recent progresses of LFHPs for photocatalytic applications and discusses strategies to improve their performance and stability.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Sujun Ji, Xuan Meng, Xiaochen Wang, Tianxin Bai, Ruiling Zhang, Bin Yang, Keli Han, Junke Jiang, Feng Liu
Summary: In this study, CsAgCl2 nanocrystals with tunable particle size and desirable warm white-light emission were synthesized using europium chloride and cadmium chloride. The quantum efficiency of the nanocrystals was improved by trace doping with antimony (Sb3+).
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Physics, Applied
Ming Shi, Bin Yang, Siping Liu, Ruiling Zhang, Keli Han, Can Li, Rengui Li
Summary: In this study, stable lead-free broadband emission under ambient conditions was achieved by introducing antimony (Sb) doping. The doping of Sb regulated the transfer of free excitons to extrinsic self-trapped excitons (STEs) and reduced nonradiative recombination, which are responsible for the significantly enhanced broad emission. Femtosecond transient absorption results elucidated the exciton dynamics and confirmed this mechanism.
ENERGY MATERIAL ADVANCES
(2022)
Review
Chemistry, Multidisciplinary
Panwang Zhou, Keli Han
Summary: This review provides a systematic and comprehensive summary of the recent development and applications of excited-state intramolecular proton transfer-based aggregation-induced emission luminogens (ESIPT-based AIEgens). It classifies the constructed AIEgens based on the relation between ESIPT and AIE unit and reviews their applications in various fields. The review also discusses the recent advances in theoretical methods for studying molecular photochemistry in crystals and their applications in ESIPT-based AIEgens. The remaining challenges in this field and the need for further research are also addressed.
Article
Chemistry, Multidisciplinary
Fangjian Shang, Runze Liu, Meiheng Lv, Yinhua Ma, Jianyong Liu, Panwang Zhou, Chaoyang Zhang, Ke-li Han
Summary: The study revealed the important role of the benzyl group in the synthesis of CL-20 precursor HBIW and the mechanism by which it reduces energy and barriers through pi-pi stacking interactions. It was found that the reaction can produce 16 intermediates with different chirality, and the steric hindrance effect of the benzyl group leads to corrections of chirality errors, guiding the selection of the most suitable reactant.
Article
Chemistry, Multidisciplinary
Fangjian Shang, Runze Liu, Meiheng Lv, Yinhua Ma, Jianyong Liu, Panwang Zhou, Chaoyang Zhang, Ke-Li Han
Summary: The benzyl group plays a crucial role in the synthesis of CL-20 precursor HBIW by reducing energy barriers through pi-pi stack interactions. The study revealed the formation of 16 intermediates with different chiralities, only some of which can lead to the final product.
