The present invention provides a photoluminescent security ink for continuous ink-jet printing, wherein said ink has a viscosity of about 1.5 mPas to about 6 mPas at 25 C., and comprises: a) from about 4 wt-% to about 6 wt-% of uncapped NaX.sub.1-y-zF.sub.4Yb.sub.yZ.sub.z nanoparticles; b) from about 1.5 wt-% to about 10 wt-% of a dispersing agent; c) from about 80 wt-% to about 90 wt-% of an organic solvent; and d) from about 0.1 wt-% to about 1 wt-% of a conductive salt, as well as a process for producing said ink, and a process for manufacturing a photoluminescent security feature on an article, or a value document, with said ink.

Scintillator materials, as well as related systems, and methods of detection using the same, are described herein. The scintillator material composition may comprise a Tl-based scintillator material. For example, the composition may comprise a thallium-based halide. Such materials have been shown to have particularly attractive scintillation properties and may be used in a variety of applications for detection radiation.

A curable resin composition for a color filter of a display device includes, among other things: a coloring agent; and a photoinitiator; and further includes one or more particles configured to absorb light in the near-infrared region of light and configured to emit light in the ultraviolet region of light.

The invention presents a near-infrared photothermal coupling curing non-oxide ceramic slurry, along with its preparation method and application. The ceramic slurry consists of various raw materials, with weight fractions as follows: non-oxide ceramic powder (4090 parts), photosensitive resin (0.520 parts), photosensitive monomer (140 parts), photoinitiator (0.254 parts), thermal initiator (0.254 parts), additive (0.755 parts), and up-conversion luminescent material (0.54 parts). The non-oxide ceramic powders can include Si.sub.3N.sub.4, TiN, BN, AlN, SiC, WC, TiC, ZrC, TiB.sub.2, and ZrB.sub.2. By combining the photochemical and photothermal dual curing system using near-infrared up-conversion, this invention addresses the issue of insufficient curing encountered in single photocuring or thermal curing processes. Moreover, by incorporating near-infrared light source-driven additive manufacturing, it enables rapid prototyping of high-solid-content non-oxide ceramic slurry, ultimately allowing for the fabrication of high-fidelity non-oxide ceramic structures.

Various examples are provided related to superfluorescence (SF) at room temperature. In one example, an upconversion nanoparticle (UCNP) includes a nanocrystal lattice doped with a rare earth element, the rare earth element distributed in the nanocrystal lattice with a coupling distance that produces anti-Stokes shifted SF. The rare earth element can be a Nd.sup.3+ ion.

Scintillator materials, as well as related systems, and methods of detection using the same, are described herein. The scintillator material composition may comprise a Tl-based scintillator material. For example, the composition may comprise a thallium-based halide. Such materials have been shown to have particularly attractive scintillation properties and may be used in a variety of applications for detection radiation.

A single-mode excitation color-changing luminescent upconversion material, and its preparation method are provided. The molecular formula of the single-mode excitation color-changing luminescent upconversion material is A.sub.xMOCl.sub.y-1:Yb/Ln, where A is at least one of Lithium(I) ion (Li.sup.+), Sodium(I) ion (Na.sup.+), Sodium(I) ion (K.sup.+), or Cesium(I) ion (Cs.sup.+); M is at least one of Lanthanum(III) ion (La.sup.3+), Yttrium(III) ion (Y.sup.3+), Gadolinium(III) ion (Gd.sup.3+), or Lutetium(III) ion (Lu.sup.3+); Ln is at least one of Erbium(III) ion (Er.sup.3+), Holmium(III) ion (Ho.sup.3+), or Holmium(III) ion (Tm.sup.3+), with 1x4 and 4y7. The excitation wavelength range of the material is 950 nanometers (nm)-1100 nm, and the emission wavelength range is 400 nm-800 nm. Under single-mode near-infrared excitation, the material exhibits color-changing upconversion luminescence.

Disclosed herein is a nanocomposite particle comprising a core-shell-shell nanoparticle, an encapsulated nanorod linked with the core-shell-shell nanoparticle, and a lipid layer encapsulating the core-shell-shell nanoparticle and the encapsulated nanorod. The core-shell nanoparticle comprises a phosphor core, an inner shell layer, an outer shell layer, and a cationic polymer. The encapsulated nanorod comprises a nanorod, and a mesoporous scaffold. According to embodiments of the present disclosure, the encapsulated nanorod is linked with the core-shell-shell nanoparticle via an electrostatic interaction between the cationic polymer and the mesoporous scaffold. Also disclosed are the uses of the nanocomposite in treating diseases, for example, cancers.

Provided are a core-multishell upconversion nanophosphor capable of being excited by 80020 nm, 98020 nm, and 153020 nm near-infrared (NIR) light to emit various colors including green, red, blue, and combinations thereof, and a transparent polymer composite including the upconversion nanophosphor. A crystalline shell may be formed between the red, green, and blue emission layers to enable emission of pure red, green, or blue light, and be further formed on an outermost surface to provide a color-tunable and high-brightness upconversion nanophosphor.

A Purcell enhanced metamaterial scintillator structure comprises a conducting structure and a dielectric structure disposed adjacent to the conducting structure. The dielectric structure comprises a structure of scintillating nanoparticles.