Preparation and Characterization of Electromagnetic-Induced Rupture Microcapsules for Self-Repairing Mortars.

Cement-based materials are susceptible to internal cracks during service, leading to a reduction in their durability. Microcapsules can effectively self-repair cracks in cement-based materials. In this study, novel electromagnetic-induced rupture microcapsules (DWMs) were prepared by using the melt dispersion method with FeO nano-particles/polyethylene wax as the shell and epoxy resin as the repairing agent.

Achieving high thermal sensitivity from ratiometric CaGdAlO:Mn,Tb thermometers.

The pursuit of optical temperature sensing with high thermal sensitivity to discriminate small temperature changes without contact with the subject possesses a crucial technological and scientific significance. Ratiometric temperature detection based on transition metals and lanthanides emerges as a promising strategy to achieve the purpose due to the dopants' distinct thermal quenching rates. In this work, a new CaGdAlO:Mn,Tb luminescent thermometer was developed.

BaYBO based phosphor ceramic plates with excellent thermal stability for wLED applications.

A series of Eu3+ and Tb3+ singly doped Ba3YB3O9 phosphors were synthesized by a solution combustion approach. The most luminescent phosphors were selected as the starting materials to fabricate phosphor ceramic plates (PCPs). More intense red and green emission is observed from the PCPs than the corresponding phosphors.

Growth and Optical Spectra of Tb³⁺/Sm³⁺/Ce³⁺ Triply Doped LiYF₄Single Crystals for White-Light LEDs.

The Tb³⁺/Sm³⁺/Ce³⁺ triply doped LiYF4 single crystals were grown by a modified Bridgman method. The absorption spectra, excitation spectra, and fluorescence spectra of Tb³⁺/Sm³⁺/Ce³⁺ ions in LiYF₄ crystals were measured. The fluorescence spectra of several bands, mainly located at purplish blue ~413 nm (⁵D₃ --> ⁷F₅), yellowish green ~542 nm (⁵D₄ --> ⁷F₅), and red ~643 nm (⁴G₅/₂ --> ⁶H₉/₂), were observed under excitation of ultraviolet light.

Near and Mid-Infrared Emission Characteristics of Er³⁺/Tm³⁺/Ho³⁺-Doped LiYF₄ Single Crystals Excited by Laser Diode.

Yttrium lithium fluoride (LiYF₄) single crystals triply doped with Er³⁺/Tm³⁺/Ho³⁺ are synthesized by a vertical Bridgman method. Absorption spectra, emission spectra, and decay curves are measured to investigate the luminescent properties of the crystals. Compared with Er³⁺ singly doped and Er³⁺/Tm³⁺ and Er³⁺/Ho³⁺ doubly doped LiYF₄ crystals, an intense emission around 2.

[Effects of gamma irradiation and O2-annealing on optical spectra of Bi doped cadmium tungstate crystal].

The Bi doped tungstate of cadmium crystals were O2-annealed at various temperature, and the absorption and emission spectra of O2-annealed Bi doped tungstate of cadmium crystals were investigated. The absorption intensity decreased, and the absorption side band was shifted to blue short wavelength as the increase of annealing temperature. The emissions at 528 nm and 1 078 nm were observed under excited by 373 and 980 nm, which they were attributed to the intrinsic emission of CdWO4 crystal and emission of Bi5+ ion, respectively.

[Temperature-dependence emission properties of Eu(3+)-doped in LiNbO3 single crystal].

The temperature-dependence emission spectra of lower and upper part of Eu(3+) -doped LiNbO3 crystals from 77 to 600 K were investigated under the excitation of a 488 nm light. The results show that, for upper part of crystal, the fluorescence intensity of Eu3+ ions increases with the temperature increase, however, for lower part, the intensity first increases with the temperature increase, and then decreases obviously with temperature increase. The variations of fluorescence intensity for lower and upper part of crystals are explained.