Research on optical performance of LnOS:Er/Yb (Ln = La/Gd/Y) phosphors based on different phonon energies.

It is crucial to explore the intrinsic mechanisms that influence thermometric sensitivity. This study investigates the optical performance of materials with the same crystal structure but different phonon energies. LnOS:Er/Yb (Ln = La/Gd/Y) phosphors with similar morphology and particle sizes were prepared to systematically study the influence of different phonon energy matrices on optical properties.

Dual-emitting temperature dependent material based on Bi/Eu co-activated BaYSiO phosphor with multicolor anti-counterfeiting.

Bi, Eu co-doped BaYSiO phosphors with multi-color luminescence properties were prepared by high temperature solid state method. The structure, luminescent properties and temperature characteristics were studied by X-ray diffraction, scanning electron microscope, fluorescence spectrum and temperature-dependence of emission spectrum. BaYSiO: Bi, Eu phosphors can emit color from cyan to red when the excitation wavelength was changed from 340 nm to 390 nm, which is attributed to that there are two Bi ion emission centers, and their emission intensity will change with the change of excitation wavelength.

[Zn-Ge] co-substitutes [Ga-Ga] to coordinately broaden the near-infrared emission of Cr in GaO phosphors.

Here, a "chemical unit co-substitution" method is used to improve the near-infrared (NIR) emission of phosphors, using [Zn-Ge] to co-substitute [Ga-Ga] sites to reduce crystal field splitting to affect the structure of gallium oxide. A series of broadband NIR phosphors are synthesized by a high-temperature solid-phase method, and their phase structures, crystal structures, morphologies, diffuse reflectance spectra, and luminescence lifetimes are investigated. The Ga(Zn-Ge)O:0.

Manipulation of time-dependent multicolour evolution of X-ray excited afterglow in lanthanide-doped fluoride nanoparticles.

External manipulation of emission colour is of significance for scientific research and applications, however, the general stimulus-responsive colour modulation method requires both stringent control of microstructures and continously adjustment of particular stimuli conditions. Here, we introduce pathways to manipulate the kinetics of time evolution of both intensity and spectral characteristics of X-ray excited afterglow (XEA) by regioselective doping of lanthanide activators in core-shell nanostructures. Our work reported here reveals the following phenomena: 1.

Improved relative temperature sensitivity of over 10% K in fluoride nanocrystals engineering the interfacial layer.

Real-time temperature sensing is of significance in the bio-medical field; however, the low relative temperature sensitivity is one of the major obstacles in the development of nanothermometers. Herein, we provide an effective route that engineers the interfacial layer in a core/shell/shell nanostructure to enlarge the temperature-dependent luminescence intensity ratio (LIR) variations followed by an improved . The CaF interlayer is employed to inhibit the interaction between the core and outer shell, and increase the interfacial phonon energy to enhance the negative thermal quenching effect (TQE) of Nd ions in the outer shell and positive TQE of Er ions in the core layer.

Narrow-band RbKNa(LiSiO):Eu(0 ≤ ≤ 1) cyan-blue phosphors for full-spectrum white LEDs.

A series of RbKNa(LiSiO):Eu(0 ≤ ≤ 1) phosphors were successfully synthesized through a high-temperature solid-state reaction. The introduction of K into the RbNa(LiSiO):Eu phosphor to partially or completely replace Rb allows the emission spectrum to be modulated from blue ( = 473 nm, FWHM = 22.5 nm) to a narrow cyan band ( = 485 nm, FWHM = 21.

Designing Optical Thermometers Using Down/Upconversion CaAlZnO: Ti, Eu/Yb, Er Thermosensitive Phosphors.

Down/upconversion CaAlZnO inorganic phosphors codoped with Ti/Eu or Yb/Er were prepared. The crystal structure and downconversion luminescence properties of CaAlZnO:Ti, Eu phosphors were studied in detail. Ti and Eu occupied Al and Ca sites in the host lattice, respectively.

Tunable emission of LiSrCaSiON/:Eu phosphors based on anion substitution induction for WLEDs and optical thermometry.

Polychromatic emission can be achieved by controlling the distribution of the rare earth activator in multi-cation lattices, which can be used in the fields of white light LED and fluorescence temperature sensing. However, it is still a challenge to control their distribution and location of the target site in a given host material because the distribution of the rare earth activator is uncertain. In this paper, we have chosen LiSrCa(SiO) as the multi-cation site host and induced the distribution of Eu ions between different cation sites through anion substitution, for the first time, to regulate the luminescence characteristics of a series of LiSrCaSiON:Eu phosphors.

Fabrication of large size individual octahedral tungsten oxide hydrate and Au NPs as SERS platforms for sensitive detection of cytochrome C.

Surface-enhanced Raman scattering (SERS) has attracted much attention with its powerful trace detection and analysis capabilities, especially biological and environmental molecules. However, building a protein SERS detection platform based on semiconductor devices is a huge challenge. Herein, through the synergy of NH and nickel foam, a large-sized semiconductor tungsten oxide hydrate platform (WOHP) was synthesized.

Integrating Positive and Negative Thermal Quenching Effect for Ultrasensitive Ratiometric Temperature Sensing and Anti-counterfeiting.

Fluorescence intensity ratio-based temperature sensing with a self-referencing characteristic is highly demanded for reliable and accurate sensing. Although enormous efforts have been devoted to explore high-performance luminescent temperature probes, it remains a daunting challenge to achieve highly relative sensitivity which determines temperature resolution. Herein, we employ a novel strategy to achieve temperature probes with ultrahigh relative sensitivity through integrating both positive and negative thermal quenching effect into a hydrogel.

Ultrabroadband Tuning and Fine Structure of Emission Spectra in Lanthanide Er-Doped ZnSe Nanosheets for Display and Temperature Sensing.

Realizing multicolored luminescence in two-dimensional (2D) nanomaterials would afford potential for a range of next-generation nanoscale optoelectronic devices. Moreover, combining fine structured spectral line emission and detection may further enrich the studies and applications of functional nanomaterials. Herein, a lanthanide doping strategy has been utilized for the synthesis of 2D ZnSe:Er nanosheets to achieve fine-structured, multicolor luminescence spectra.

Enhancing the luminescence performance in germanosilicate glasses controlled by ZnF.

Rare-earth-doped optical functional glasses have attracted great interest for their excellent luminous performance in the applications of optical communications and biomedical systems. To the best of our knowledge, it is demonstrated for the first time that more than seven times' enhancement of luminescence performance in the mid-infrared region (MIR) has been obtained in germanosilicate glasses controlled by ZnF. Larger absorption and emission cross sections of the Ho:  I5→I5 transition indicate that this kind of germanosilicate-zinc glass may provide high gain as a good medium for an efficient 2.

Enhanced 3 μm luminescence properties based on effective energy transfer Yb : F→Dy : H in fluoaluminate glass modified by TeO.

Enhanced 3 μm luminescence of Dy based on the effective process of Yb:F2→Dy:H6 with a higher energy transfer coefficient of 7.36×10  cm/s in fluoaluminate glass modified by TeO was obtained. The energy transfer efficiency from Yb to Dy in Dy/Yb codoped glass was as high as 80%, indicating the effective energy transfer of Yb.