Showing papers in "Journal of Luminescence in 2020"

TL;DR: In this paper, the authors propose a definition for solids that requires the use of an integrating sphere and clarify terms related to quantum yield and efficiency as well as those characterizing light properties.

TL;DR: In this paper, the authors compare two distinct NIR phosphors with Type I and Type II emissions in terms of their structure, crystal field, and emission profile and then provide their perspective on what the ideal emission must be.

TL;DR: In this article, an efficient fabrication of N-doped graphene quantum dots (GQDs) showing controllable chemical and fluorescence properties through infrared carbonization (IRC) of citric acid and urea.

TL;DR: In this article, a review of I-III-VI core/shell QDs is presented, focusing on various synthetic strategies, optical properties, surface modification and the applications of these QDs.

TL;DR: In this article, a series of Eu3+-activated Ca2GdSbO6 double-perovskite red phosphors with good thermal stability toward warm-white LEDs were reported.

TL;DR: In this paper, the authors classified the various host materials used in red or deep red-emitting phosphors from a different kind of host materials and from a view point of the photoluminescence (PL) and PL excitation (PLE) properties.

TL;DR: In this paper, the effects of different -NH2 group positions on the excited-state intramolecular proton transfer (ESIPT) mechanisms and its photophysical properties were investigated by using time-dependent DFT calculations.

TL;DR: In this article, a solid phase reaction was used to synthesize Yb3+/Er3+ codoped Bi4Ti3O12 phosphor microcrystals for optical temperature sensing.

TL;DR: In this paper, the effect of Fe3+ ion content on the phase structure, morphology, thermal stability and luminescent behaviors of the resulting samples was systematically studied, and the results revealed that the Er3+/Yb3++/Fe3+-tridoped NaGdF4 nanorods were potential upconverting compounds for ratiometeric nanothermometers and optical heaters.

TL;DR: In this article, a new temperature sensing strategy based on dual activators is proposed in order to solve the problem of high temperature sensitivity and good signal discriminability at the same time.

TL;DR: In this article, the effects of Eu2O3 content on the structure and properties of glasses were studied, aiming to provide a key guidance for the preparation of reddish orange light emitting glass.

TL;DR: In this paper, the luminescence properties of the Mn4+ and Cr3+-activated fluoride and oxide phosphors have been discussed in detail, and they can be classified into five types from an aspect of different luminecence properties.

TL;DR: A series of Eu3+-doped double perovskite Ca2MgTeO6 (CMTO) red-emitting phosphors with high thermal stability were successfully prepared using the solid-state reaction at 1100°C as discussed by the authors.

TL;DR: In this paper, the bonding parameters, energy band gaps and nephelauxetic ratios of Dy3+/Eu3+co-doped LiPbAlB glasses have been performed through absorption, photoluminescence, colour coordinates, correlated colour temperatures (CCT) and decay spectral profiles.

TL;DR: In this article, the relationship among the glass's structure, the luminescent properties and the ratio of Ge/Si was analyzed in the glass matrix, and the influence of Dy3+ ions concentration on the luminecent properties was studied as well.

TL;DR: In this article, the Dy3+ Li+ co-doped MgTiO3 phosphor has been successfully synthesized through a high temperature solid state reaction method and the structural measurement suggests that the doping of Li+ ion improves the crystallinity and particles size of the phosphor.

TL;DR: In this paper, the authors presented two types of self-calibrating metal-organic framework (MOF) thermometers with both the organic chromophore and lanthanide emissions, which proposed an elegant avenue to address these concerns.

TL;DR: In this article, temperature-dependent luminance spectra and luminescence decay curves of the CGMS:Mn4+/Sm3+ phosphor were measured at a large temperature range of 298-573 k and showed that the luminance intensity of Mn4+ ions decreases much more rapidly compared to that of Sm3+ ions as the temperature increases.

TL;DR: In this paper, a new strategy for optical thermometer with high sensitivity was developed by employing exciton recombination of CsPbBr3 quantum dots as temperature detecting signal and 4f→4f transition Eu3+ ions as reference one.

TL;DR: In this article, a modified Pechini technique was used to synthesize single phase nanoparticles with no additional phase, and the emission and excitation spectra of Sm3+-doped YVO4 nanocrystalline powders were studied in detail.

TL;DR: In this article, a novel Sm3+-doped double perovskite Ca2MgTeO6 orange-red emitting phosphors were prepared using solid-state reaction at 1100-C. The powder phase purity, particle morphology and size, elemental composition, and luminescence properties of prepared samples were analyzed in detail.

TL;DR: In this paper, a tunable white emissions from Bi3+ and Eu3+ ions co-doped with Ba2Y5B5O17 phosphors were achieved by controlling the energy transfer process from Bi 3+ to Eu 3+ ions.

TL;DR: In this article, a series of Eu3+-activated double-perovskite Ca2LaTaO6 (abbreviated as CLT:xEu3+,; x = 0.8) red-emitting phosphors have been successfully synthesized via the conventional high-temperature solid-state reaction method.

TL;DR: This history of upconversion (UC) as mentioned in this paper starts from a critical discussion about the idea of Bloembergen for an IRQC with my thesis Director: "it could not be a thesis subject because during the ions lifetimes not enough energy could be stored" and directed me towards energy transfers study and the discovery of accepting ions already in their excited states which are the necessary steps for UC.

TL;DR: In this article, the up-converting Sr3(PO4)2:Er3+,Yb3+ phosphor, exhibiting anti-Stokes luminescence has been developed as an optical temperature sensor.

TL;DR: In this article, a spectroscopic investigation of Dy3+/Tb3+ and Dy3 + Tb3 + Eu3+ doped lithium-aluminum-zinc phosphate glasses is performed through their photoluminescence spectra and decay time measurements.

TL;DR: In this article, a series of ternary complexes with monodentate ancillary ligands such as aqua, urea, triphenylphosphineoxide (TPPO) and pyridine-Noxide (PNO) were illustrated through various structural and photo-physical spectroscopic practices.

TL;DR: In this article, a solution combustion technique was adopted to prepare a homogeneous crystalline Ba3Y4O9:Sm3+ down-conversion nanophosphor emitting bright reddish orange light.

TL;DR: In this article, spatial isolation of Er3+ and Cr3+ ions selectively entering into the precipitated LaF3 and Ga2O3 nanocrystals after crystallization is achieved, which fundamentally improves the thermal sensitivity as well as broadens the detective temperature range for the reduced detrimental energy transfers (ETs) between Er3+, Cr3+.

TL;DR: In this article, a garnet-type cubic structure with the Ia 3 ‾ d space group was used for the synthesis of Y3MgAl3SiO12 (YMAS) phosphors.