Patent ID: 9250183
Filing Date: 2016-02-02
CPC Classification: G01N,G07D

Claim Text:
1. A luminescent material comprising: first particles of a first inorganic host lattice having at least one first substance dispersed within the first inorganic host lattice, wherein the first particles are capable of producing first emissions having one or more first emission peaks at one or more first wavelengths, wherein the one or more first wavelengths include at least one first visible wavelength within the visible spectrum, and the first emissions at the first visible wavelength have a first decay half-life that is long enough for the first emissions at the first visible wavelength to be perceptible to the human eye for a first time period that begins when appropriate excitation of the luminescent material is discontinued; and second particles of a second inorganic host lattice having at least one second substance dispersed within the second inorganic host lattice, wherein the second particles are capable of producing second emissions having one or more second emission peaks at one or more second wavelengths, wherein the one or more second wavelengths include at least one second visible wavelength within the visible spectrum, wherein the second visible wavelength is different from the first visible wavelength, and the second emissions at the second visible wavelength have a second decay half-life that is longer than the first decay half-life by a decay time difference that is sufficient for the second emissions at the second visible wavelength to be perceptible to the human eye for a second time period that begins after the first time period; wherein the first inorganic host lattice and the second inorganic host lattice are selected from a group consisting of a fluoride, a halide, a borate, a gallate, a phosphate, a vanadate, an oxyhalide, a molybdate, a tungstate, a garnet, a germanate, a chlorophosphate, a niobate, a silicate, and mixtures thereof; and one or more media within which the first particles and the second particles are incorporated, wherein the one or more media are selected from a group consisting of an ink, an ink additive, a liquid, a gel, a ceramic, a metal, a textile, wood, fiber, paper pulp, paper, and mixtures thereof.