Ruggedized luminescent nanoparticle tracers have luminescent nanoparticle cores coupled to a luminescent substrate. The substrate is a large-particle size phosphor, while the nanoparticles are photoluminescent quantum dots (QDs) whose emission spectra can be tuned based on their chemical composition, size, and fabrication (e.g., dopants). The QDs are encapsulated by a protective layer to form a nanoparticle core. The protective layer can shield the QDs from external environments that would otherwise damage the delicate QDs. The substrate is also encapsulated by a protective layer, and the protective layer of the nanoparticle core is coupled to the protective layer of the substrate via a molecular linker to form a tracer particle complex. The tracer particle complexes can be disposed in a silicate suspension for subsequent use.

Provided is an aluminate fluorescent material having a high emission intensity and having a composition containing a first element that contains one or more of Ba and Sr, and a second element that contains Mg and Mn. In the composition, when a molar ratio of Al is 10, a total molar ratio of the first element is a parameter a, a total molar ratio of the second element is a parameter b, a molar ratio of Sr is a product of a parameter m and the parameter a, a molar ratio of Mn is a product of a parameter n and the parameter b. The parameters a and b satisfy 0.5<b<a≤0.5b+0.5<1.0, the parameter m satisfies 0≤m≤1.0, and the parameter n satisfies 0.4≤n≤0.7.

Provided is an aluminate fluorescent material having a high emission intensity and having a composition containing a first element that contains one or more of Ba and Sr, and a second element that contains Mg and Mn. In the composition, when a molar ratio of Al is 10, a total molar ratio of the first element is a parameter a, a total molar ratio of the second element is a parameter b, a molar ratio of Sr is a product of a parameter m and the parameter a, a molar ratio of Mn is a product of a parameter n and the parameter b. The parameters a and b satisfy 0.5<b<a≤0.5b+0.5<1.0, the parameter m satisfies 0≤m≤1.0, and the parameter n satisfies 0.4≤n≤0.7.

Disclosed are a method of producing an aluminate fluorescent material, such an aluminate fluorescent material, and a light emitting device. The aluminate fluorescent material production method includes: subjecting a first mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, and at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, in which a compound containing Mg may be optionally mixed, to first heat treatment to give a first calcined product having an average particle diameter D1, as measured according to a Fisher Sub-Sieve Sizer method, of 6 μm or more; and subjecting a second mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, and the first calcined product whose content is 10% by mass or more and 90% by mass or less relative to the total amount of the second mixture, in which a compound containing Mg may be optionally mixed, to second heat treatment to give a second calcined product.

Disclosed are a method of producing an aluminate fluorescent material, such an aluminate fluorescent material, and a light emitting device. The aluminate fluorescent material production method includes: subjecting a first mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, and at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, in which a compound containing Mg may be optionally mixed, to first heat treatment to give a first calcined product having an average particle diameter D1, as measured according to a Fisher Sub-Sieve Sizer method, of 6 μm or more; and subjecting a second mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, and the first calcined product whose content is 10% by mass or more and 90% by mass or less relative to the total amount of the second mixture, in which a compound containing Mg may be optionally mixed, to second heat treatment to give a second calcined product.

Provided is a fluoride phosphor that has a good external quantum efficiency and is suitable for stably producing white LEDs. The fluoride phosphor having a composition represented by a general formula (1), a bulk density of 0.80 g/cm.sup.3 or more, and a mass median diameter (D50) of 30 μm or less: general formula: A.sub.2M.sub.(1-n)F.sub.6:Mn.sup.4+.sub.n (1), wherein 0<n≤0.1, the element A is one or more alkali metal elements including at least K, and the element M is a simple substance of Si, a simple substance of Ge, or a combination of Si and one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf.

Provided is a fluoride phosphor that has a good external quantum efficiency and is suitable for stably producing white LEDs. The fluoride phosphor having a composition represented by a general formula (1), a bulk density of 0.80 g/cm.sup.3 or more, and a mass median diameter (D50) of 30 μm or less: general formula: A.sub.2M.sub.(1-n)F.sub.6:Mn.sup.4+.sub.n (1), wherein 0<n≤0.1, the element A is one or more alkali metal elements including at least K, and the element M is a simple substance of Si, a simple substance of Ge, or a combination of Si and one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf.

The present invention relates to a metal fluoride red phosphor and an application of the phosphor as a light emitting element, the metal fluoride red phosphor having a tetragonal crystal structure of a novel composition, and emitting light in the red color wavelength by being excited by ultraviolet rays or a blue excitation source, thereby being usefully applicable to a light emitting element such as a light emitting diode, a laser diode, a surface emitting laser diode, an inorganic electroluminescence element, and an organic electroluminescence element.

The present invention relates to a metal fluoride red phosphor and an application of the phosphor as a light emitting element, the metal fluoride red phosphor having a tetragonal crystal structure of a novel composition, and emitting light in the red color wavelength by being excited by ultraviolet rays or a blue excitation source, thereby being usefully applicable to a light emitting element such as a light emitting diode, a laser diode, a surface emitting laser diode, an inorganic electroluminescence element, and an organic electroluminescence element.

An optoelectronic component is disclosed. In an embodiment, an optoelectronic component includes a semiconductor chip configured to emit primary radiation having a peak wavelength between 420 nm inclusive and 480 nm inclusive and a conversion element including a first converter material configured to partially convert the primary radiation into secondary radiation in a green range of the electromagnetic spectrum and a second converter material configured to partially convert the primary radiation into a secondary radiation in a red region of the electromagnetic spectrum, wherein the second converter material including a first red phosphor of the formula (K,Na).sub.2(Si,Ti)F.sub.6:Mn.sup.4+ and a second red phosphor of the formula(M).sub.2-xEu.sub.xSi.sub.2Al.sub.2N.sub.6 where M=Sr, Ca, Ba, and/or Mg and 0.001x0.2, and wherein the optoelectronic device is configured to emit white total radiation.