Article
Materials Science, Multidisciplinary
Jie Chen, Chao Wang, Yu Yin, Rong Liu, Fanxu Meng, Shanshan Wang, Zhigang Liu, Shihua Yu
Summary: Intelligent regulation of energy transfer process among different rare earth ions can enhance the upconversion luminescence intensity. Wheat ears-like YF3 microrods doped with Yb3+/Er3+/(Tm3+, Ho3+) were fabricated and the UC luminescence performance dependent on Tm3+/Ho3+ doping concentrations was studied. The study provides a reference for the development of high-efficiency luminescent materials.
Article
Chemistry, Multidisciplinary
Yu Ding, Tongyu Liu, Mengmeng Yan
Summary: This study focused on the performance and characteristic parameters of Ho: GdVO4 crystal as a gain medium for building a laser, and investigated the influence of the output mirror transmittance on laser generation. The results showed that the laser wavelength blue-shifted with increasing output transmittance.
APPLIED SCIENCES-BASEL
(2021)
Article
Optics
Panqiang Kang, Xinlu Zhang, Xiaofan Jing, Conghui Chen, Shuai Pang, Jinjer Huang
Summary: A dual-wavelength passively Q-switched self-Raman laser in the 2.5 μm wave band using Cr:ZnS as a saturable absorber was demonstrated. Synchronized dual-wavelength pulsed laser outputs at 2473nm and 2520nm were obtained, corresponding to Raman frequency shifts of 808 cm(-1) and 883 cm(-1), respectively. The maximum total average output power of 114.9mW was achieved at specific conditions.
Article
Chemistry, Multidisciplinary
Jiayan Liao, Jiajia Zhou, Yiliao Song, Baolei Liu, Yinghui Chen, Fan Wang, Chaohao Chen, Jun Lin, Xueyuan Chen, Jie Lu, Dayong Jin
Summary: The article discusses the resolution of the entire lifetime profile of single upconversion nanoparticles using various microscopy techniques, pushing the limit of optical multiplexing from microscale to nanoscale, and exploring the creation of time-domain optical fingerprints using nanophotonic upconversion schemes.
Article
Chemistry, Physical
Schindra Kumar Ray, Bhupendra Joshi, Sivasubramanian Ramani, Sungkwon Park, Jin Hur
Summary: In this study, alpha-NiMoO4:Yb3+ (15 mol%)/Ln(3+) (Ln = Tm, Ho, Tm/Ho) phosphors with different doping concentrations of Tm3+ and Ho3+ were successfully synthesized using a microwave hydrothermal method. The phosphors exhibited multicolor and white emissions under 980 nm laser diode excitation, and MTT assay confirmed their non-cytotoxic nature at low concentrations in bovine skeletal muscle cells. These findings suggest the potential applications of these phosphors in multicolor bio-imaging, color displays, and white light sources.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Youhui Zhou, Yao Cheng, Ju Xu, Hang Lin, Yuansheng Wang
Summary: Recent discoveries have uncovered the temperature-dependent upconversion luminescence behavior of inert-core/active-shell UCNPs, where both the sensitizer and activator are located near the nanoparticle surface, leading to a stronger luminescence thermal enhancement tendency compared to active-core UCNPs. This thermal enhancement behavior appears to be core-size dependent and is suggested to be attributed to the alleviation of surface quenching induced by lattice thermal expansion, based on the relationship between size-dependent luminescence and lattice expansion coefficient.
Article
Chemistry, Multidisciplinary
Yingdong Han, Xingxing Zhang, Ling Huang
Summary: This article reviews recent advances in the temporal response and lifetime of lanthanide-doped upconversion luminescence, discussing means of temporal response regulation and existing challenges. It provides fundamental insights for deeper understanding and further applications of the temporal response features of upconversion luminescence.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Materials Science, Ceramics
Yuwaraj K. Kshetri, Bina Chaudhary, Dhani Ram Dhakal, G. Murali, Surya Pachhai, Hak-Soo Kim, Tae -Ho Kim, Soo Wohn Lee
Summary: In this study, Ho and Yb co-doped SiAlON ceramics were investigated for their upconversion photoluminescence properties at room temperature and high temperatures. The results showed intense red upconversion emission under 980 nm excitation at room temperature, and high-temperature spectral stability due to the low thermal expansion coefficient of SiAlON ceramics. The concentration of Ho and Yb also had an anomalous effect on the upconversion behavior, challenging the common understanding of sensitized luminescence.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Hao Lin, Zhiyuan Cheng, Dekang Xu, Xuegang Zheng, Jun Ge, Liqin Xu, Ying Ma, Shenghong Yang, Yueli Zhang
Summary: The study successfully synthesized small-sized red-emitting UC nanoparticles, developed a novel mechanism for Ho-based red emission, and demonstrated potential biomedical applications in a mouse experiment.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Nanoscience & Nanotechnology
Rashmi Joshi, Sourav Patra, Manas Srivastava, Bheeshma Pratap Singh, Avik Chakraborty, Sandeep Balu Shelar, Rubel Chakravarty, Sudipta Chakraborty, Raghumani Singh Ningthoujam
Summary: Nearly monodispersed NaGdF4/Ho-Yb upconversion nanoparticles with biocompatible mesoporous silica coating were synthesized. These nanoparticles exhibit red and green bands in the visible range upon excitation at different wavelengths of light. The potential applications of these nanoparticles as drug carriers and therapeutic radionuclide carriers were demonstrated.
ACS APPLIED NANO MATERIALS
(2022)
Article
Materials Science, Ceramics
Yu Yang, Zhiwei Zhou, Bingchu Mei, Yongqiang Zhang, Xinwen Liu
Summary: By investigating the effects of different sintering temperatures and doping concentrations, it was found that Er:SrF2 transparent ceramics sintered at 900 degrees Celsius showed superior luminescence performance, with stronger green emission compared to Er:CaF2, similar red emission, and longer luminescence lifetime. This indicates that Er:SrF2 transparent ceramics are a promising candidate for green fluorescent upconversion materials.
CERAMICS INTERNATIONAL
(2021)
Article
Physics, Applied
Lingling Gao, Shiwei Shen, Qi Wang, Wujun Shi, Yi Zhao, Changhua Li, Weizheng Cao, Cuiying Pei, Jun-Yi Ge, Gang Li, Jun Li, Yulin Chen, Shichao Yan, Yanpeng Qi
Summary: The study investigated the magnetic and transport properties of RMn6Sn6 (R = Tb, Dy, Ho) compounds with clean Mn kagome lattice, revealing distinct collinear ferrimagnetic structures and changing magnetoresistance with temperature. An intrinsic anomalous Hall conductivity was observed for each compound, suggesting RMn6Sn6 system as a promising platform for exploring related topological or quantum phenomena in future research.
APPLIED PHYSICS LETTERS
(2021)
Article
Instruments & Instrumentation
Huawen Hu, Haizhou Huang, Wen Weng, Hui Zheng, Wenxiong Lin
Summary: This study presented a 2-mu m wavelength-switchable Tm/Ho composite laser with a compact hybrid cavity and changeable output couplers, demonstrating different laser outputs in various operating modes. The Tm laser and Ho laser achieved distinct power and pulse width characteristics, while the laser source showed advantages such as accessibility, multifunctionality, and miniaturization.
INFRARED PHYSICS & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Yingdong Han, Chao Gao, Tian Wei, Kun Zhang, Zhang Jiang, Junhe Zhou, Mengjiao Xu, Lisha Yin, Feng Song, Ling Huang
Summary: Unlike organic dyes or quantum dots, upconversion luminescence is a statistics of individual activators' temporal behaviors, and its dynamics are associated with energy transfer and migration. Dynamic UCL can be achieved by modulating the excitation laser, without the need for complex material engineering.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Materials Science, Multidisciplinary
Premakumar Yanda, F. Orlandi, P. Manuel, N. Boudjada, J. Rodriguez-Carvajal, A. Sundaresan
Summary: The study reveals the occurrence of a linear magnetoelectric effect and field-induced ferromagnetism and ferroelectricity below T-N(R) in orthorhombic green phases R2BaCuO5 (R = Dy and Ho). The compounds exhibit a first-order magnetic transition enabling linear magnetoelectric coupling, followed by metamagnetic transitions above a critical field. The important role of 4f-3d coupling in determining the ground state magnetic structure responsible for the magnetoelectric coupling is discussed.
