A5045310165- Luminescence Properties of Advanced Materials
- Radiation Detection and Scintillator Technologies
- Perovskite Materials and Applications
- Gas Sensing Nanomaterials and Sensors
- Luminescence and Fluorescent Materials
- Advanced Photocatalysis Techniques
- X-ray Diffraction in Crystallography
- Nuclear materials and radiation effects
- Crystallization and Solubility Studies
- Glass properties and applications
- Solid-state spectroscopy and crystallography
- Advanced Condensed Matter Physics
- Inorganic Fluorides and Related Compounds
- Laser Applications in Dentistry and Medicine
- Nanoplatforms for cancer theranostics
- Lanthanide and Transition Metal Complexes
- Catalytic Processes in Materials Science
- Electronic and Structural Properties of Oxides
- Quantum Dots Synthesis And Properties
- Inorganic Chemistry and Materials
- Acoustic Wave Resonator Technologies
- Microwave Dielectric Ceramics Synthesis
- Atomic and Subatomic Physics Research
- Carbon and Quantum Dots Applications
- Ammonia Synthesis and Nitrogen Reduction
Guangdong Academy of Sciences
2018-2024
Guangdong Provincial Academy of Environmental Science
2018-2024
Guangdong Institute of Rare Metals
2018-2021
Central South University
2021
Guangzhou Research Institute of Non-ferrous Metals
2007-2016
Sun Yat-sen University
2009-2013
Quantum dot light-emitting diode (QLED) displays are considered a next-generation technology, but previously reported quantum dots (QDs) consisting of heavy metals toxic and harmful. This work examined earth-abundant, metal-free, graphitic C3N4 (g-C3N4) with exceptional optical electronic properties, excellent chemical thermal stability, an appropriate band gap, non-toxicity for QLED applications. The dependence the luminescence performance on reaction atmosphere temperature; transformation...
Near-infrared (NIR) persistent luminescence (PersL) materials are attractive multifunctional-material-platforms to real-time-required studies and applications in chemistry biomedicine. However, the inefficient charging by low-irradiance, noncoherent, high-tissue-penetration red–NIR light restricts their developments situ, such as long-term tracking, whole-body, deep-tissue bioimaging. To address this issue, we develop a novel Cr3+-activated Na0.5Gd0.5TiO3 NIR-PersL material with perovskite...
Abstract Technological progress has accelerated the researches into broadband near‐infrared (NIR) luminescent materials as next‐generation intelligent NIR light sources; however, poor thermal stability restricts applications of phosphors. Herein, new insights Cr 3+ ‐activated phosphors with improved are provided. The photoluminescence intensity originating from 4T2→4A2 emission CaLu 2 Al 4 SiO 12 :Cr (CLAS:Cr) optimal electron occupation ( T / E) increases up to 118% at 475 K compared that...
Energy transfer enables the CaY 2 Al 4 SiO 12 :Ce 3+ ,Mn 2+ phosphor to produce a broad band emission covering bluish green deep red region. A high color rendering index WLED can be obtained.
In order to obtain a suitable red phosphor for mercury-free lamps and plasma display panels (PDPs), samples of trivalent europium-activated polyphosphate LiGd(PO(3))(4):Eu(3+) (LGP:Eu(3+)) were prepared by solid-state reaction technique at high temperature. The vacuum ultraviolet (VUV)-visible spectroscopic properties investigated. Because the LiGd(1-x)Eu(x)(PO(3))(4) x = 0.50 shows broad strong absorption in VUV region exhibits intensive emission under 147/172 nm excitation comparison with...
Tremendous success has been achieved in photovoltaic (PV) applications, but PV-generated electricity still cannot compete with traditional power terms of price. Chemically stable and nontoxic all-oxide solar cells made from earth-abundant resources fulfill the requirements for low-cost manufacturing under ambient conditions thus are promising as next-generation approach to cells. However, main obstacles developing spectral absorbers. Besides photovoltaics, novel chemically stable, nontoxic,...
Materials with near-infrared (NIR) persistent luminescence (PersL) and NIR-to-NIR photostimulated (PSL) properties are attractive platforms for photonic energy harvesting release. In this work, we develop Mg2SnO4:Cr as a broadband NIR PersL PSL material (luminescence maxima at ∼800 nm) reveal the origin of properties. The has an inverse spinel structure Mg2+ Sn4+ disorder Wyckoff 16d site based on Rietveld refinement. Cr K-edge X-ray absorption near-edge (XANES) spectra uncover that doped...
An unusual concentration quenching effect is caused by the anisotropic distribution of centers in GdGaTi 2 O 7 :Eu 3+ .
In this study, a novel temperature-sensitive material, Sr3Y2Ge3O12:Bi3+,Sm3+ phosphor, was successfully synthesized by solid-state reaction method. Under 376 nm light excitation, the as-prepared phosphor presents both blue emissions of Bi3+ and orange red Sm3+ due to energy transfer from Sm3+. Owing significant difference in thermal quenching properties distinguishable emission between ions, temperature sensing performance prepared evaluated measuring fluorescence intensity ratio (FIR)...
A narrow-band red-light component is critical to establish high color rendition and a wide gamut of phosphor-converted white-light-emitting diodes (pc-WLEDs). In this sense, Mn4+-doped K2SiF6 fluoride the most successful material that has been commercialized. As with K2SiF6:Mn4+ phosphors, tantalum heptafluoride (K2TaF7:Mn4+) fulfills similar luminescence behavior brought in promising red phosphor. But limited brightness low moisture-resistant performances have inevitably blocked its...
The occurrence of energy transfer (ET) would enhance the luminescence activator but sacrifice that sensitizer. However, novel Sm3+-doped Ca2TbSn2Al3O12 (CTSAO) phosphor reported here seems to be an exception. In series CTSAO:xSm3+ phosphors investigated, something unexpected occurs; activator, Sm3+, did not gain any compensation from sensitizer, Tb3+, when temperature increases. Instead, loss Sm3+ accelerates, simultaneously, Tb3+ accordingly alleviates. By careful calculations on ET...
phosphors were synthesized by a high temperature solid-state reaction method, and their luminescence properties investigated. ions occupy two different sites in these phosphors, the emissions derived from luminescent centers are discussed terms of matrix structure. The site occupancy energy-transfer process give rise to concentration-dependent behaviors, emission color may be tuned large gamut blue-green yellow-green controlling concentration. Because exhibit strong absorption range near-UV...
Developing novel luminescent materials with ideal properties is an endless project, urged by growing requirements of advances in energy saving, healthy lighting and environmental friendliness. Herein, a series ScCaOBO3:Ce3+,Mn2+ phosphors excellent luminescence were synthesized the high temperature solid state method. X-ray diffraction was applied to analyse phase composition obtained phosphors. The morphology dopant distribution observed scanning electron microscopy (SEM) dispersive...
Optical temperature sensing based on the variation of fluorescence intensity ratio rare-earth materials has become appealing due to its multiple superiorities over electrical sensing.
Abstract Research on lithium compounds has attracted much attention nowadays. However, to elucidate the precise structure of is a challenge, especially when considering small ions that may be transferred between interstitial voids. Here, discovery reduced local symmetry (symmetry breaking) in domains Li 2 SrSiO 4 reported by employing Eu 3+ as spectroscopic probe, for which X‐ray, neutron, and electron diffraction have confirmed average long‐range with space group P 3 1 21. luminescence...
Cr3+-Activated broadband near-infrared (NIR) luminescence materials are attracting much attention as next-generation smart NIR light sources that widely used in night vision, bioimaging, medical treatment, and many other fields. Herein, a series of Na3GaxAl1-xF6:Cr3+ phosphors with emission tunable properties were designed prepared. The intensity, peak position full width at half maximum (FWHM) the can be controlled by adjusting crystal field strength. Furthermore, Na3Ga0.75Al0.25F6:0.35Cr3+...
Polymorphic rare-earth disilicates RE2Si2O7 (RE = La–Lu, Y, and Sc) are attractive materials as thermal barrier coatings scintillators; however, the orthorhombic E(δ)-type Eu–Ho Y) triclinic F-type Sm Eu) remain structurally controversial hitherto. In this work, we revisit crystal structures of E(δ)-RE2Si2O7 (Pnma), F-RE2Si2O7 (P1̅), monoclinic G-La2Si2O7 (P21/n) by X-ray single-crystal/powder diffraction. The second-harmonic generation (SHG) and/or local-structure-sensitive VUV–UV–vis...
High-efficiency near-infrared (NIR) emitting materials play a crucial role in biomedicine, agriculture, spectroscopy, etc., and the stannates emerge due to their broadband millisecond-lifetime NIR luminescence. However, origin has confused community for 20 years. In this work, we combine first-principles calculations with experiments explicitly unveil that unique emission originates from electronic transitions of trace impurities rather than previously proposed Sn2+-related self-trapping...
A detailed investigation on photoluminescence properties and energy transfer (ET) dynamics of Ce3+, Pr3+-doped BaY2Si3O10 is provided along with the potential X-ray excited luminescence application. The Pr3+ are studied in VUV-UV-vis spectral range at low temperature, profiles Pr3+3P0 1D2 emission lines determined using time-resolved spectra. Upon 230 nm excitation, electron population from 4f5d state to its 4f2 discussed detail. As concentration rises, possess different...