An improved system and method for reading an upconversion response from nanoparticle inks is provided. A is adapted to direct a near-infrared excitation wavelength at a readable indicia, resulting in a near-infrared emission wavelength created by the upconverting nanoparticle inks. A short pass filter may filter the near-infrared excitation wavelength. A camera is in operable communication with the short pass filter and receives the near-infrared emission wavelength of the readable indicia. The system may further include an integrated circuit adapted to receive the near-infrared emission wavelength from the camera and generate a corresponding signal. A readable application may be in operable communication with the integrated circuit. The readable application receives the corresponding signal, manipulates the signal, decodes the signal into an output, and displays and/or stores the output.

Provided are perovskite quantum dots showing an independent photoreaction to light stimulation in different wavelength bands from each other, a method for preparing the perovskite quantum dots, and an anti-counterfeiting ink including the perovskite quantum dots.

A single-band upconversion luminescent material includes an amorphous ceramic host; and lanthanide ions doped into the ceramic host.

A lutetium nitride-based phosphor and a light emitting device comprising the same, wherein the lutetium nitride-based phosphor comprises an inorganic compound, and the composition of the inorganic compound comprises at least an M element, an A element, a D element and an R element; the M element is one or two elements selected from a group consisting of Lu, La, Pr, Nd, Sm, Y, Tb and Gd, and necessarily comprises Lu; the A element is Si and/or Ge; the D element is one or two elements selected from a group consisting of O, N and F, and necessarily comprises N; the R element is Ce and/or Dy, and the atomic molar ratio of the Lu element in the M element is greater than 50%. Because the ion radius of Lu3+ is smaller than the ion radius of La3+, the light color performance thereof can be flexibly adjusted according to needs.

The present invention relates to a phosphor, a method for preparing the phosphor, an optoelectronic component, and a method for producing the optoelectronic component. The phosphor has the following general formula: La.sub.3(1x)Ga.sub.1yGe.sub.5(1z)O.sub.16: 3xA.sup.3+, yCr.sup.3+, 5zB.sup.4+, where x, y, and z do not equal to 0 simultaneously; A represents at least one of Gd and Yb; B represents at least one of Sn, Nb, and Ta. For the phosphor, its emission spectrum is within a red visible light region and a near-infrared region when excited by blue visible light, purple visible light or ultraviolet light; and it has a wide reflection spectrum and a high radiant flux. Therefore, it can be used in optoelectronic components such as LEDs to meet requirements of current medical testing, food composition analysis, security cameras, iris/facial recognition, virtual reality, gaming notebook and light detection and ranging applications.

A phosphor includes a crystal phase with a chemical composition (Lu.sub.xY.sub.1-x).sub.yM.sub.3-y-zCe.sub.z.sub.p.sub.q. M denotes one or more elements selected from the group consisting of La, Sc, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb. contains Si, which constitutes 90% or more by mole of . contains N, which constitutes 90% or more by mole of . The variables x, y, z, p, and q satisfy 0<x1, 1.5y3z, 0<z0.6, 5.5p6.5, and 10.5q11.5. The phosphor has an emission spectrum peak at a wavelength in the range of not less than 600 nm and not more than 680 nm.

Phosphor, a preparation method for the phosphor, and a light emitting device having the phosphor. The phosphor comprises an inorganic compound which at least comprises an element M, an element A, an element D, and an element R; the element M is one or two elements selected from the group consisting of Lu, La, Pr, Nd, Sm, Y, Tb, and Gd and must comprise Lu; the element A is Si and/or Ge; the element D is one or two elements selected from the group consisting of O, N, and F and must comprise N; the element R is Ce and/or Dy. Since the ionic radius of Lu3+ is smaller than that of La3+, when the inorganic compound comprises element Lu, the original ligand site would be contracted. In order to reduce lattice distortion due to the ligand site contraction, the adjacent ligand site expands, and the photochromic property is adjusted.

A sintered phosphor-composite having a high internal quantum efficiency and a high transmittance is provided. The object can be achieved with a sintered phosphor-composite including a nitride phosphor and a fluoride inorganic binder, wherein, in cross-sectional observation, the sintered phosphor-composite includes at least a portion in which voids of not more than 1 m are present in a number of not more than 700 within a cross-sectional area of 0.046 mm.sup.2, or a portion having a void area fraction of not more than 3% within a cross-sectional area of 0.046 mm.sup.2.

The present disclosure relates to a process for fabricating a crystalline scintillator material with a structure of elpasolite type of theoretical composition A.sub.2BC.sub.(1-y)M.sub.yX.sub.(6-y) wherein: A is chosen from among Cs, Rb, K, Na, B is chosen from among Li, K, Na, C is chosen from among the rare earths, Al, Ga, M is chosen from among the alkaline earths, X is chosen from among F, Cl, Br, I,
y representing the atomic fraction of substitution of C by M and being in the range extending from 0 to 0.05, comprising its crystallization by cooling from a melt bath comprising r moles of A and s moles of B, the melt bath in contact with the material containing A and B in such a way that 2s/r is above 1. The process shows an improved fabrication yield. Moreover, the crystals obtained can have compositions closer to stoichiometry and have improved scintillation properties.

The disclosure relates to lanthanum-yttrium oxide scintillators used for detecting radiation, such as X-rays, gamma rays and thermal neutron radiation and charged particles, in security, medical imaging, particle physics and other applications.