Glass Ceramic Fibers Containing PbS Quantum Dots for Fluorescent Temperature Sensing.

Glass ceramics (GCs) containing PbS quantum dots (QDs) are prepared for temperature sensing. Broadband emissions are detected in the GCs when PbS QDs are precipitated from the glasses, and emissions centers are modulated from 1250 nm to 1960 nm via heat treatments. The emission centers of GCs exhibit blue-shifts when environment temperatures increase from room temperature to 210 °C.

Enabling Broadband Solar-Blind UV Photodetection by a Rare-Earth Doped Oxyfluoride Transparent Glass-Ceramic.

Oxyfluoride transparent glass-ceramics (GC) are widely used as the matrix for rare-earth (RE) ions due to their unique properties such as low phonon energy, high transmittance, and high solubility for RE ions. Tb doped oxyfluoride glasses exhibit a large absorption cross section for ultraviolet (UV) excitation, high stability, high photoluminescence quantum efficiency, and sensitive spectral conversion characteristics, making them promising candidate materials for use as the spectral converter in UV photodetectors. Herein, a Tb doped oxyfluoride GC is developed by using the melt-quenching method, and the microstructure and optical properties of the GC sample are carefully investigated.

Photoelectric properties of glass-ceramics containing KTbF nanocrystals for UV detection.

In this work, a glass ceramics (GC) containing KTbF nanocrystals was fabricated by controlled crystallization of an fluorosilicate glass heat-treatment. The microstructure, luminescence, and photoelectric properties of the GCs are systematically studied by X-ray diffraction, transmission electron microscopy, spectral analysis, and current-voltage (-) curves. The results show that the GC containing KTbF nanocrystals exhibit intense visible emission due to the 4f transition of Tb: D ( = 3, 4) → F ( = 0-6) upon excitation of ultraviolet (UV) light.

A high-performance metal halide perovskite-based laser-driven display.

Laser-driven liquid crystal displays (LCDs) comprising metal halide perovskites (MHPs) as the blue-to-green/red color converters are at the forefront of ongoing intense research on the development and improvement of display devices. However, the inferior high photoluminescence quantum yield (PLQY) of MHPs under the excitation of high-power blue light and photoluminescence deterioration at high temperatures remain major concerns. Herein, we design a kind of octylamine-modified MHP binding energy engineering, and the synthesized materials show PLQY of 97.

Low-Temperature Fluoro-Borosilicate Glass for Controllable Nano-Crystallization in Glass Ceramic Fibers.

A fluorosilicate (FS) nano-crystallized glass ceramic (NGC) is one of the most commonly used gain materials for applications in optical devices due to its excellent thermal stability as well as high-efficiency luminescence. However, FS glass can hardly be used to prepare NGC fibers due to its high preparation temperature. Here, a series of low-temperature fluoro-borosilicate (FBS) glasses were designed for the fabrication of active NGC fibers.

Superflexible Inorganic Ag Te S Fiber with High Thermoelectric Performance.

Fiber-based inorganic thermoelectric (TE) devices, owing to the small size, light-weight, flexibility, and high TE performance, are promising for applications in flexible thermoelectrics. Unfortunately, current inorganic TE fibers are strictly constrained by limited mechanical freedom because of the undesirable tensile strain, typically limited to a value of 1.5%, posing a strong obstacle for further application in large-scale wearable systems.

Efficient white upconversion luminescence in Yb/Eu doubly-doped transparent glass ceramic.

Efficient white upconversion (UC) luminescence is obtained in Yb/Eu doubly-doped optical glass ceramic (GC) for the first time. KYbF nanocrystals are controllably precipitated from the amorphous networks via the inducing of Yb. Yb ions are spontaneously confined within the compact fluoride crystal structures to produce efficient blue UC emissions of Yb-Yb pairs.

Nano-Crystallization of Ln-Fluoride Crystals in Glass-Ceramics via Inducing of Yb for Efficient Near-Infrared Upconversion Luminescence of Tm.

Transparent glass-ceramic composites embedded with Ln-fluoride nanocrystals are prepared in this work to enhance the upconversion luminescence of Tm. The crystalline phases, microstructures, and photoluminescence properties of samples are carefully investigated. KYbF nanocrystals are proved to controllably precipitate in the glass-ceramics via the inducing of Yb when the doping concentration varies from 0.

High-efficiency luminescence in optical glass via the controllable crystallization of KYbF nanocrystals depending on the dopants.

A transparent glass ceramic (GC) is designed via the controllable precipitation of nanocrystals. It is shown that the crystallization in GC deeply depends on the doping of . ions are spontaneously distributed in the fluoride crystal environments without the ionic substitution process of traditional GC.

Modulation of activator distribution by phase-separation of glass for efficient and tunable upconversion luminescence.

Amorphous glass is a significant luminescence matrix for various applications, such as fiber lasers, lighting and 3D data storage. However, the efficiency of luminescence, especially upconversion (UC) luminescence, in glass is usually low. The UC emission of transition metal ions is hardly observed in amorphous glass.

Correction: Enhanced up-conversion luminescence in transparent glass-ceramic containing KErF:Er nanocrystals and its application in temperature detection.

[This corrects the article DOI: 10.1039/C9RA01945F.].

Enhanced up-conversion luminescence in transparent glass-ceramic containing KErF:Er nanocrystals and its application in temperature detection.

Transparent Er doped glass-ceramics containing KErF:Er nanocrystals were prepared the traditional melt-quenching technique. The micro-structures, optical properties and up-conversion luminescence behaviors of the Er doped glass-ceramics were systemically studied using X-ray diffraction, absorption and up-conversion luminescence spectra. Under the excitation of a laser at 980 nm, the intensity of red emission of the glass-ceramics increases more than 70 times after heat treatment compared with that of the precursor glass ceramic.

Highly sensitive temperature sensor using packaged optical microfiber coupler filled with liquids.

A novel temperature sensor based on a Teflon capillary encapsulated 2 × 2 optical microfiber coupler (OMC) filled with refractive index matching liquids is described. The sealed capillary and the filling liquid are demonstrated to enhance the temperature sensing performance, achieving a high temperature sensitivity of 5.3 nm/°C.

Formation, element-migration and broadband luminescence in quantum dot-doped glass fibers.

All solid-state PbS quantum dot (QD)-doped glass precursor fibers avoiding crystallization during fiber-drawing process are successfully fabricated by melt-in-tube technique. By subsequent heat treatment schedule, controllable crystallization of PbS QDs can be obtained in the glass precursor fibers, contributing to broad near-infrared emissions from PbS QD-doped glass fibers. Nevertheless, we find that element-migration and volatilization of sulfur simultaneously happen during the whole fiber-drawing process, because of the huge difference between the melting temperature of core glass and the fiber-drawing temperature.

Selective doping of Ni in highly transparent glass-ceramics containing nano-spinels ZnGaO and Zn Ga Ge O for broadband near-infrared fiber amplifiers.

Selective doping of Ni in octahedral sites provided by nanocrystals embedded in glass-ceramics (GCs) is crucial to the enhancement of broadband near-infrared (NIR) emission. In this work, a NIR emission with a full-width-at-half-maximum (FWHM) of 288 nm is first reported from ZnGaO: Ni nano-spinels embedded GCs with excellent transparency. A comparison is made of the NIR luminescence properties of Ni doped GCs containing ZnGaO, germanium-substituted ZnGaO nano-spinels (Zn Ga Ge O), and ZnGeO/LiGeO composite nanocrystals that are free of Ga.

Glass-ceramic optical fiber containing BaTiSiO nanocrystals for frequency conversion of lasers.

A glass-ceramic optical fiber containing BaTiSiO nanocrystals fabricated using a novel combination of the melt-in-tube method and successive heat treatment is reported for the first time. For the melt-in-tube method, fibers act as a precursor at the drawing temperature for which the cladding glass is softened while the core glass is melted. It is demonstrated experimentally that following heat treatment, BaTiSiO nanocrystals with diameters below 10 nm are evenly distributed throughout the fiber core.

Enhanced upconversion emission in crystallization-controllable glass-ceramic fiber containing Yb(3+)-Er(3+) codoped CaF2 nanocrystals.

Functional nanocrystal-containing materials have been a hot topic in recent years. However, few researches have focused on functional nanocrystals contained in optical glass fibers. In this research, transparent CaF2 glass-ceramic was prepared by a melt-quenching method.

Ni(2+) doped glass ceramic fiber fabricated by melt-in-tube method and successive heat treatment.

Glass ceramic fibers containing Ni(2+) doped LiGa(5)O(8) nanocrystals were fabricated by a melt-in-tube method and successive heat treatment. Fiber precursors were prepared by drawing at high temperature where fiber core glass was melted while fiber clad glass was softened. After heat treatment, LiGa(5)O(8) nanocrystals were precipitated in the fiber core.