A5052779876- Luminescence Properties of Advanced Materials
- Perovskite Materials and Applications
- Glass properties and applications
- Advanced Condensed Matter Physics
- Radiation Detection and Scintillator Technologies
- Microwave Dielectric Ceramics Synthesis
- Lanthanide and Transition Metal Complexes
- Nuclear materials and radiation effects
- Crystal Structures and Properties
- Advanced biosensing and bioanalysis techniques
- Solid-state spectroscopy and crystallography
- Inorganic Fluorides and Related Compounds
- Optical properties and cooling technologies in crystalline materials
- Supercapacitor Materials and Fabrication
- Luminescence and Fluorescent Materials
- Quantum Dots Synthesis And Properties
- Biosensors and Analytical Detection
- Advanced Nanomaterials in Catalysis
- Solid State Laser Technologies
- Advanced Photocatalysis Techniques
- Conducting polymers and applications
- SARS-CoV-2 detection and testing
- Advanced Sensor and Energy Harvesting Materials
- Photorefractive and Nonlinear Optics
- Non-Invasive Vital Sign Monitoring
Aarhus University
2024
Qingdao University of Science and Technology
2024
University of Aveiro
2020-2023
Ocean University of China
2023
Beijing Jishuitan Hospital
2023
Peking University
2023
Anhui Agricultural University
2023
Stockholm University
2022
Nanjing University of Chinese Medicine
2022
Sun Yat-sen University
2015-2020
Mn4+-activated oxide phosphors La(MgTi)1/2O3 (LMT) with far-red emitting were prepared via a sol–gel route. The structures of samples determined by X-ray diffraction (XRD) and Reitveld refinement. occupied sites Mn4+ (d3 electronic configuration) in host confirmed ab initio calculations which the system has lower formation energy, stable lattice structure, strong bonding state as enters into Ti site. luminescent properties Mn4+-doped investigated; emit light centered at 708 nm ultraviolet...
Systematic research indicates that Pr<sup>3+</sup> doped La<sub>2</sub>MgTiO<sub>6</sub> has application potential in the highly sensitive optical thermometry field.
Realizing sensitive sub-tissue thermometry with a large signal-to-noise ratio <italic>via</italic> finely tailoring the local site symmetry in La<sub>2</sub>O<sub>3</sub>:Er<sup>3+</sup>/Yb<sup>3+</sup> nanospheres.
Abstract Mn 2+ ‐activated phosphors usually show green to red luminescence depending on the crystal field strength in lattice. However, severe intensity loss of at elevated temperatures remains be a serious problem. Here, observation zero‐thermal quenching (λ em = 620 nm) up 500 K Eu , ‐codoped BaMgP 2 O 7 is reported. This phenomenon arises from an efficient energy transfer sensitizers which, when singly doped, exhibits substantial thermal‐induced enhancement 5d→4f emission 400 nm, along...
Investigations on luminescence properties of lanthanide-activated phosphors are not only essential to understanding the fundamental structure-property relationship but also important advancing development and application relevant research techniques. We report herein a promising optical thermometric material Eu2+-doped Li4SrCa(SiO4)2 utilizing different sensitivities EuSr2+ EuCa2+ emission intensities temperature. A unique evolution Eu2+ in as-prepared sample is identified under simultaneous...
The lithium yttrium silicate series of LiY1–xLnxSiO4 exhibits superb chemical and optical properties, with Ln = Ce3+, Sm3+, its spectroscopic characteristics luminescence dynamics are investigated in the present work. Energy transfer nonradiative relaxation dramatically influence Ln3+ spectra decay dynamics, especially Ce3+–Sm3+ codoped phosphors. It is shown that thermal-quenching blue Ce3+ primarily due to thermal ionization 5d excited states rather than multiphonon relaxation, whereas...
A series of LuNbO4:Pr3+ phosphors was prepared by a solid-state reaction method at high-temperature. Rietveld refinements were performed based on powder X-ray diffraction (XRD) data. Diffuse reflectance spectra (DRS), UV–vis photoluminescence (PL), time-resolved emission (TRES), and fluorescence decays utilized to study the luminescence host sensitization processes Pr3+ in LuNbO4. Excitation wavelength dependent investigated explained consideration nonradiation relaxation via...
Thermal enhancement of upconversion luminescence in lanthanide-doped nanocrystals are summarized and the mechanism is discussed detail with a fresh perspective.
Ln3+-doped (Ln = lanthanide) nanocrystals are garnering strong interest for their potential as optical materials in various applications. For that reason, a thorough understanding of photophysical processes and ways to tune them these is great importance. This study, using Eu3+-doped Sr2YF7 well-suited model system, underscores the (not unexpected) significance surface site occupation Ln3+ also challenges prevailing views about contribution luminescence system. High-temperature cation...
Ce(3+), Eu(3+), and Tb(3+) singly doped, Ce(3+)-Tb(3+), Tb(3+)-Eu(3+), Ce(3+)-Eu(3+) doubly as well Ce(3+)-Tb(3+)-Eu(3+) triply doped LiYSiO4 phosphors were prepared by a high-temperature solid-state reaction technique. Rietveld refinement was performed to determine the structure of host compound. The cross-relaxation (CR) is quantitatively analyzed with Inokuti-Hirayama model energy transfer (ET), site occupancy confirmed emission spectra Eu(3+). ET metal-metal charge (MMCT) are...
A single-phase intense white-light-emission is achieved in LuNbO<sub>4</sub>:Dy<sup>3+</sup> phosphors.
The energy transfer between Ce3+ and Eu2+ has been investigated in the host Ca3Sc2Si3O12 (CSS), prepared by a modified sol–gel method. Excitation emission measurements from near-infrared to vacuum ultraviolet spectral regions have performed upon CSS, Ce3+-doped Eu2+-doped CSS Ce3+, Eu2+-co-doped at various concentrations, including experiments temperatures range of 15–460 K. efficiency can approach 90%, donor decay curves for different acceptor concentrations codoped system were fitted...
Nowadays, it is still a great challenge for lanthanide complexes to be applied in solid state lighting, especially high-power LEDs because they will suffer severe thermal-induced luminescence quenching and transmittance loss when are operated at high current. In this paper, we have not only obtained efficient thermally chemical stable red emitting hybrid material by introducing europium complex into nanozeolite (NZ) functionalized with the imidazolium-based stopper but also abated its...
Unsatisfactory photoluminescence efficiency of Ln3+-doped nanocrystals severely restricts their practical application, which has been frequently correlated to the active phonon mediation in system. Although phonon-mediated nonradiative relaxation Ln3+ mostly explained by "energy gap law", a growing body observational anomalies raises questions about general applicability and validity this frequency-orientated model. For that reason, an improved understanding, questioning commonly accepted...
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are considered promising light sources for night vision, food analysis, biomedicine, and plant growth. Yet, the application potential of this technology is vulnerable to function degradation phosphors used, such as thermal quenching, which needs be addressed urgently. Herein, NIR K2LiMF6:Cr3+ (M = Al, Ga, In) with a cubic double-perovskite structure synthesized by green hydrofluoric acid-free hydrothermal method exhibit...
In this work, a latent energy-transfer process in traditional Eu3+ ,Tb3+ -doped phosphors is proposed and new class of Na4 CaSi3 O9 (NCSO) presented which enabled by luminescence decay dynamics that optimize the electron-transfer energy process. Relative to other phosphors, as-synthesized NCSO show improved large-scale tunable emission color from green red upon UV excitation, controlled Tb3+ /Eu3+ doping ratio. Detailed spectroscopic measurements vacuum ultraviolet (VUV)/UV/Vis region were...
Surface quenching is the main reason limiting luminescence performance of Ln 3+ ‐doped nanocrystals and their practical applications. Although shell passivation strategy effectively improves efficiency, understanding relevant mechanisms remains elusive contradictory explanations are often proposed. Herein, context debates on this topic reviewed emphasizing that discordant viewpoints probably due to lack consideration chemical disorders such as inhomogeneity, core–shell element intermixing,...
Abstract Although extending conductive polymer chains into the pores of Metal–Organic Frameworks (MOFs) leverages their advantage high conductivity and ultra‐high surface area for “double‐high” electrode materials, only MOFs bulk can be occupied by conducting reported methods. To solve these issues, a selective etching subsequent electrochemical polymerization strategy is employed. First, hierarchical porous UiO‐66 (HPMOF) prepared acetate process, creating abundant mesopores vein‐like...
Low-temperature photoluminescence properties of Sr1–2xCexNaxAl2O4 (x = 0.001) synthesized by a solid-state reaction method are measured with excitation energies in the vacuum ultraviolet (VUV) to (UV) range. Two distinct activator centers different emission and intensities observed attributed Ce3+ occupying Sr1 Sr2 sites SrAl2O4 probabilities. Hybrid density functional theory (DFT) calculations within supercell model then carried out optimize local structures located at two Sr SrAl2O4, on...
Investigation of optical properties Ce3+-activated phosphors is not only practical importance for various applications but also fundamental providing a basis to understand relevant other lanthanide ions in the same host. We report herein combined experimental and theoretical study Ce3+ Li4SrCa(SiO4)2. Photoluminescence material prepared by solid-state reaction method are investigated with excitation energies vacuum-ultraviolet (VUV) ultraviolet (UV) range at low temperatures. The band maxima...