Review
Chemistry, Multidisciplinary
Simona Premcheska, Mirijam Lederer, Anna M. Kaczmarek
Summary: Theranostics combines diagnostics and therapy in a single multifunctional system. Multifunctional upconversion luminescent lanthanide-doped nanothermometers offer non-invasive and sensitive multimodal performance in the biomedical field, enabling applications in (bio)imaging, temperature sensing, photodynamic and photothermal therapy, as well as drug delivery.
CHEMICAL COMMUNICATIONS
(2022)
Review
Chemistry, Inorganic & Nuclear
Anees A. Ansari, Abdul K. Parchur, M. K. Nazeeruddin, Mohammad M. Tavakoli
Summary: Recent advancements in remote optical nanothermometry have been significant, particularly in the field of bio-applications such as theranostics and photodynamic therapy. The use of luminescence thermometry technique allows for accurate temperature monitoring in biological bodies. Selecting the appropriate host matrix is crucial in achieving high performance of optical nanothermometers.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Chemistry, Inorganic & Nuclear
Yao Wang, Jingxiang Low, Yafei Bi, Yu Bai, Yonghu Chen, Ran Long, Yujie Xiong
Summary: Functional resins with optical adjustment capability, functionalized with upconversion nanocrystals (UCNCs), specifically a UCNC-Au composite structure, have been developed to convert near-infrared (NIR) radiation into visible-light emission. These UCNC-functionalized resins, characterized by high transparency and flexibility, are expected to accelerate the comprehensive utilization of NIR in practical applications.
DALTON TRANSACTIONS
(2021)
Review
Chemistry, Multidisciplinary
Huhui Fu, Changhe Hu, Jie Liu, Qi Zhang, J. Y. Xu, G. J. Jiang, M. Liu
Summary: This review provides a comprehensive survey on the existing approaches for highly enhanced upconversion luminescence of lanthanide-doped nanoparticles. The approaches can be classified into chemical methods and physical strategies. Chemical methods include chemical composition tuning, core-shell engineering, and ligand modification, while physical strategies involve laser excitation modulation and near-field regulation. The challenges and future opportunities associated with lanthanide-doped upconversion nanoparticles are also discussed.
Article
Chemistry, Multidisciplinary
Richard C. Knighton, Lohona K. Soro, Alexandre Lecointre, Guillaume Pilet, Alexandra Fateeva, Laurie Pontille, Laura Frances-Soriano, Niko Hildebrandt, Loic J. Charbonniere
Summary: Nonanuclear lanthanide complexes represent a new class of solution-state upconversion (UC) molecules, showing a very efficient UC phenomenon with Tb luminescence in the visible region upon 980 nm NIR excitation of Yb. These new molecular complexes exhibit an unprecedented UC efficiency of 1.0 x 10(-7) at only 2.86 W cm(-2), up to 26 times more efficient than current molecular systems, and UC can be observed down to a concentration of 10 nM.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Li Xu, Yu Liu, Ziwen Zhou, Xianhao Sun, Isam Ud Din, Fahim Khan, Yanzeng Li, Hanyang Li, Jing Ren, Joan J. Carvajal, Jianzhong Zhang, Lu Liu
Summary: Yb3+ serves not only as a sensitizer but also as an energy reservoir to improve the upconversion efficiency of various lanthanide activators by facilitating energy cycling between the activator and Yb3+. This energy cycling not only enhances energy utilization for upconversion luminescence generation but also provides an additional excited-state absorption route for the activator.
Article
Chemistry, Multidisciplinary
Fuhua Huang, Niusha Bagheri, Li Wang, Hans Agren, Jinglai Zhang, Rui Pu, Qiuqiang Zhan, Yuhan Jing, Wen Xu, Jerker Widengren, Haichun Liu
Summary: Lanthanide upconversion nanoparticles (UCNPs) have been extensively studied for their applications in healthcare, energy, and information technology. The use of a core-shell structure is an important approach to enhance the brightness and functionality of UCNPs. However, the issue of cation intermixing at the interface of core-shell nanoparticles remains a challenge, and a facile method to control it is lacking.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Chang Zhou, Datao Tu, Siyuan Han, Peng Zhang, Luping Wang, Shaohua Yu, Jin Xu, Renfu Li, Xueyuan Chen
Summary: The article introduces a new class of UC nanocrystals based on Cs2NaYF6:Yb/Tm nanoplatelets, which exhibit efficient multiphoton UC emissions without the need for complicated core/multishell structures. The study demonstrates that Cs2NaYF6 has a unique structure that facilitates energy migration of Ln(3+) dopants, resulting in intense red and green UC emissions.
Article
Chemistry, Physical
Ze-Yu Lyu, Hao Dong, Xiang-Fei Yang, Ling-Dong Sun, Chun-Hua Yan
Summary: By studying the highly polarized upconversion emissions from lanthanide-doped LiYF4 crystals, this research deepens our understanding of polarized photoluminescence and explores the potential for unique upconversion orientation sensors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Chengyu Zhuo, Zeyu Lyu, Dashuai Sun, Sida Shen, Taixing Tan, Shuai Wei, Zhijun Li, Pengcheng Luo, Hongpeng You
Summary: Na2MgScF7 (NMSF) was synthesized for the first time through hydrothermal and high-temperature solid-state reactions. The NMSF crystalizes in the space group Imma, with the cell parameters a = 10.40860(18), b = 7.32804(12), c = 7.52879(11) angstrom, alpha = beta = gamma = 90 degrees, and V = 574.256(24) angstrom(3). Doping with Tb3+ or Eu3+ ions allows for yellow-green or red emission in NMSF-based phosphors, respectively. In addition, upconversion emission can be achieved by doping with Yb3+-Er3+, Yb3+-Tm3+, Yb3+-Ho3+, or Er3+. The synthesized NMSF:Er3+ phosphor exhibits green upconversion emission at 980 nm excitation and red emission at 1532 nm excitation.
DALTON TRANSACTIONS
(2023)
Review
Chemistry, Multidisciplinary
Sonali Mohanty, Anna M. Kaczmarek
Summary: Recent advances in upconversion luminescent materials have highlighted their importance in both scientific research and future applications. However, the low upconversion luminescence intensity and limited tuneability hinder their versatile applications. This tutorial review focuses on the implementation of transition metal ion co-dopants to enhance upconversion efficiency in lanthanide nanomaterials. The review summarizes recent studies on the tailored design of UC materials with transition metal ion co-dopants and discusses the desirable functionality of transition metal ions in the host matrixes. In addition to improving upconversion efficiency, the incorporation of transition metal co-dopants has sparked interest in applications such as in vivo imaging, drug delivery, and nanothermometers.
CHEMICAL SOCIETY REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Yi Cheng, Yubin Wang, Denghao Li, Juan Bao, Degang Deng, Hai Guo, Lei Lei
Summary: Lanthanide doped Gd2Ti2O7 crystals prepared by a modified sol-gel method show enhanced luminescence intensity at higher temperatures, resulting in high relative temperature sensitivity and potential applications in temperature sensing and anti-counterfeiting.
CHEMICAL COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Haolin Yang, Anshuo Zhang, Hai Guo, Denghao Li, Shiqing Xu, Lei Lei
Summary: This study proposes an effective strategy to significantly enhance the upconversion (UC) intensity of nanoparticles (NPs) by constructing local energy clusters. By increasing the doping concentrations and reducing energy loss, UC efficiency is greatly improved. In addition, the formation of energy clusters within the crystal lattice also changes the relationship between UC intensity and temperature, resulting in enhanced temperature sensing performance.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Mikkel Baldtzer Liisberg, Satu Lahtinen, Ane Beth Sloth, Tero Soukka, Tom Vosch
Summary: The frequency encoded upconversion (FE-UPCON) widefield microscopy allows for multiplexed signal recovery in imaging by separating luminescence from spectrally and spatially overlapping trivalent lanthanide ions in upconversion nanoparticles. This technique utilizes periodic coexcitation with a secondary light source modulated at a chosen frequency to enhance the luminescence of the lanthanide ions of interest, enabling selective imaging and single UCNP detection without compromising sensitivity. FE-UPCON introduces a new dimension (frequency space) for multiplexed imaging with UCNPs.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Inorganic & Nuclear
Yuwei Liu, Lingshun Meng, Hong Wang, Jianxin Jiao, Mingming Xing, Yong Peng, Xixian Luo, Ying Tian
Summary: In this study, trivalent lanthanide-doped BiVO4 was used as a novel upconversion luminescence material for high-efficiency UCL and temperature sensing. The co-doping of Er3+/Tm3+, Yb3+/Er3+, and Yb3+/Tm3+ ions in BiVO4 phosphors achieved high color-purity RGB colors. The optimal doping concentration yielded an upconversion quantum yield of 2.9% in BiVO4:8%Yb3+,18%Er3+ phosphor.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Multidisciplinary
Youchao Wei, Yao Zhao, Caiping Liu, Zhaoyu Wang, Feilong Jiang, Yongsheng Liu, Qing Zhao, Dapeng Yu, Maochun Hong
Summary: Organic-inorganic hybrid perovskite solar cells have faced challenges in achieving both high efficiency and long-term stability. A new CsPbI3/CaF2 perovskite/fluoride nanocomposite shows promise in addressing these issues, delivering efficient and ultra-stable performance. By incorporating CaF2 into the crystal lattice of CsPbI3 perovskite, the nanocomposite effectively passivates defects and suppresses ion migration, resulting in improved power conversion efficiency and extended device lifetime compared to control devices.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Optics
Yuhan Ma, Youchao Wei, Feilong Jiang, Yongsheng Liu, Maochun Hong
Summary: A rational perovskite/upconversion hetero-structured design strategy was proposed to achieve excitonic upconversion luminescence from all-inorganic CsPbX3 perovskites through fluorescence resonance energy transfer. The strategy involves integrating CsPbX3 perovskites and upconverting CaF2:Ln nanocrystals using a modified two-step epitaxial growth approach, resulting in unique upconverting CsPbX3/CaF2:Ln hetero-structured nanocomposites with extremely high FRET efficiency. The prepared hetero-structured nanocomposites outperform pure CsPbX3 perovskites in terms of air-stability, thermal-stability, and excitonic downconversion luminescence intensity, demonstrating significant advantages for high-performance optoelectronic and photovoltaic applications.
JOURNAL OF LUMINESCENCE
(2022)
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
Materials Science, Multidisciplinary
Hao Chen, Zhifen Wu, Jianxi Ke, Guowei Li, Feilong Jiang, Yongsheng Liu, Maochun Hong
Summary: A new class of Ln(3+)-doped core-shell NPs with ultralow excitation power density has been successfully constructed, showing exceptional photothermal stability. The crystallographic defects reduction is the primary cause underlying the ultralow-power-excitable feature of these NPs, paving a new way for future biomedical applications.
SCIENCE CHINA-MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yameng Chen, Zhaoyu Wang, Youchao Wei, Yongsheng Liu, Maochun Hong
Summary: In this study, a simple and efficient Sn2+ vacancy tuning strategy was proposed to enhance excitonic localization in 2D (OA)(2)SnI4 perovskite nanosheets, thereby increasing their photoluminescence quantum yield (PLQY) to approximately 64%, which is one of the highest reported values for tin iodide perovskites. Experimental and first-principles calculation results confirmed that the significantly increased PLQY was primarily due to self-trapped excitons with highly localized energy states induced by the vacancy. Furthermore, this universal strategy can be applied to improve other 2D Sn-based perovskites, providing a new way to fabricate diverse 2D lead-free perovskites with desirable photoluminescent properties.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Optics
Zhaoyu Wang, Youchao Wei, Caiping Liu, Yongsheng Liu, Maochun Hong
Summary: By embedding Mn2+ ions into 0D Cs3Cu2I5 NSs, a simple Mn2+ activation strategy is proposed to enhance their radioluminescence and stability. The resulting Mn2+-activated 0D Cs3Cu2I5 NSs exhibit a much higher light yield and achieve an ultrahigh X-ray imaging resolution and ultra-low detection limit, making them promising candidates for flexible X-ray detection and imaging.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Physical
Xiaohan Li, Aijun Liu, Zhaoyu Wang, Youchao Wei, Qun Lin, Yameng Chen, Yongsheng Liu, Maochun Hong
Summary: A doping-enhanced exciton-phonon coupling effect is observed in Cs3Cu2I5 nanocrystals, leading to a significant increase in their self-trapped excitons emission efficiency. This discovery shows great potential for improving optoelectronic devices.
Article
Chemistry, Physical
Shihui Jiang, Jianxi Ke, Guowei Li, Aijun Liu, Xiaohan Li, Lixiang Ye, Feilong Jiang, Yongsheng Liu, Maochun Hong
Summary: A novel acetic acid-mediated coprecipitation method is developed to synthesize ultrabright lanthanide-doped beta-NaYF4 nanoprobes at a low reaction temperature (200 degrees C). The use of acetic acid not only promotes rapid phase transformation of NaYF4 host and boosts the photoluminescence quantum yield of NaYF4 nanocrystals but also enables optical-guided dynamic vasculature imaging in vivo with high spatial resolution. The results demonstrate the potential of these nanoprobes for the diagnosis and treatment evaluation of vasculature-related diseases.
Article
Materials Science, Multidisciplinary
Qun Lin, Zhaoyu Wang, Youchao Wei, Yameng Chen, Xiaohan Li, Yongsheng Liu, Maochun Hong
Summary: The colloidal synthesis of two-dimensional CsAgCl2 nanocrystals with typical TADF feature is reported, and the TADF mechanism is studied through theoretical calculations and experimental results. It is found that CsAgCl2 nanocrystals have a small singlet-triplet state splitting energy and a large charge density separation, meeting the prerequisites for TADF. Moreover, these CsAgCl2 nanocrystals exhibit an ultralow X-ray detection limit and a high imaging resolution, surpassing commercial scintillators.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Licheng Yu, Youchao Wei, Yuanchao Lei, Caiping Liu, Yongsheng Liu, Maochun Hong
Summary: A Ni2+-mediated halide anion-exchange strategy is proposed to achieve ultra-stable 3D CsPbX3 (X = Cl, Br, I) nanoparticles with two coexisting different perovskite individuals by using Ni2+-doped Cs4PbBr6 perovskites.
Article
Optics
Licheng Yu, Youchao Wei, Youchao Lei, Yongsheng Liu, Maochun Hong
Summary: We successfully synthesized uniform-diameter cubic-phase CsPbBr3 nanowires with favorable properties through trace Ca2+ doping. Ca2+ doping induced lattice distortion, triggering self-assembly into single-crystalline nanowires and inhibiting surface defects formation. The exciton relaxation kinetics were significantly modulated by Ca2+ doping, enhancing the photoluminescence efficiency and stability of the perovskite nanowires.
JOURNAL OF LUMINESCENCE
(2023)
Article
Multidisciplinary Sciences
Guowei Li, Shihui Jiang, Aijun Liu, Lixiang Ye, Jianxi Ke, Caiping Liu, Lian Chen, Yongsheng Liu, Maochun Hong
Summary: This study reports a method of crystal-field perturbation through interstitial H+ doping in NaMgF3:Ln(3+) nanocrystals, resulting in significant emission amplification. Mechanistic studies reveal that the perturbation effect of interstitial H+ ions on local charge density distribution enhances the radiative transition rate of Ln(3+) emitters.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Zhaoyu Wang, Yameng Chen, Jianxi Ke, Youchao Wei, Yongsheng Liu, Maochun Hong
Summary: In this study, an ultra-broadband near-infrared (NIR) emission in the range of 800-1200 nm with ultra-high emission efficiency of up to 64.2% is achieved by substituting the Sc3+ site in Cs2NaScCl6 perovskite single-crystal with a Cr3+ ion.
ADVANCED OPTICAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Wu Zhifen, Ke Jianxi, Liu Yongsheng, Sun Pengming, Hong Maochun
Summary: Compared with traditional fluorescent biological imaging, the second near-infrared (NIR-II) fluorescent biological imaging technology offers advantages of high spatial resolution, excellent signal-to-background ratio, large imaging depth, low autofluorescence, and less biological damage. Among diverse NIR-II fluorescent nanomaterials, NIR-II emitting lanthanide based nanoprobes (NIR-II Ln-NPs) have attracted extensive attention due to their good photochemical-stability, narrow emission band, tunable emission colors, and long-lived lifetime.
ACTA CHIMICA SINICA
(2022)
Review
Chemistry, Multidisciplinary
Huhui Fu, Yuhan Ma, Yongsheng Liu, Maochun Hong
Summary: The article summarizes recent advances in lanthanide-doped inorganic nanocrystals for biological applications, achieving desirable and tunable luminescence through local structure engineering. Different optical performances were obtained in nanocrystals with varied morphologies, and the impact of crystal structure on luminescence properties was discussed, with a look towards future challenges and opportunities in the field.
CHEMICAL COMMUNICATIONS
(2021)