CURRENT LIGHTING SOLUTIONS, LLC

A process for preparing a Mn +4 doped phosphor of formula I A x [MF y ]:Mn +4 I includes combining a first solution comprising a source of A and a second solution comprising H 2 MF 6 in the presence of a source of Mn, to form the Mn +4 doped phosphor; wherein A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is the absolute value of the charge of the [MF y ] ion; y is 5, 6 or 7; and wherein a value of a Hammett acidity function of the first solution is at least −0.9. Particles produced by the process may have a particle size distribution with a D 50 particle size of less than 10 μm.

The present disclosure relates to a lighting component which may comprise a light emitting diode (LED) or laser diode (LD) for generating at least one of blue light or ultraviolet light. A fluoride phosphor matrix may be included, which may be consolidated into a phosphor ceramic structure including at least one of a transparent fluoride ceramic structure or a translucent fluoride ceramic structure, and positioned adjacent to the LED or LD. The phosphor ceramic structure generates at least one of red or orange light when irradiated by the light emitted from the LED or LD. The phosphor ceramic structure exhibits reduced thermal quenching relative to a fluoride particulate structure irradiated by the LED or LD.

The present disclosure relates to a lighting component which may comprise a light emitting diode (LED) or laser diode (LD) for generating at least one of blue light or ultraviolet light. A fluoride phosphor matrix may be included, which may be consolidated into a phosphor ceramic structure including at least one of a transparent fluoride ceramic structure or a translucent fluoride ceramic structure, and positioned adjacent to the LED or LD. The phosphor ceramic structure generates at least one of red or orange light when irradiated by the light emitted from the LED or LD. The phosphor ceramic structure exhibits reduced thermal quenching relative to a fluoride particulate structure irradiated by the LED or LD.

A lighting apparatus includes a semiconductor light source in direct contact with a polymer composite comprising a color stable Mn 4+ doped phosphor, wherein the lighting apparatus has a color shift of ≤1.5 MacAdam ellipses after operating for at least 2,000 hour at a LED current density greater than 2 A/cm 2 , a LED wall-plug efficiency greater than 40%, and a board temperature greater than 25° C.

An LED assembly includes an LED light source having a first light output with a characteristic spectrum, and a yellow-green phosphor, red phosphor, and neodymium fluorine absorber combination through which the first light output passes, wherein the yellow-green phosphor, red phosphor, and neodymium fluorine absorber combination is configured to convert the first light output to a second light output having a predetermined correlated color temperature.

A lighting apparatus includes a semiconductor light source in direct contact with a polymer composite comprising a color stable Mn 4+ doped phosphor, wherein the lighting apparatus has a color shift of ≤1.5 MacAdam ellipses after operating for at least 2,000 hour at a LED current density greater than 2 A/cm 2 , a LED wall-plug efficiency greater than 40%, and a board temperature greater than 25° C.

A process for coating a phosphor of formula I: A x [MF y ]:Mn 4+ includes combining the phosphor of formula I in particulate form with a first solution including a compound of formula II: A x [MF y ] to form a suspension and combining a second solution with the suspension, the second solution including a precursor including an element selected from the group consisting of calcium, strontium, magnesium, yittrium, barium, scandium, lanthanum, and combinations thereof. A population of particles having a core including a phosphor of formula I and a manganese-free composite coating disposed on the core, and a lighting apparatus ( 10 ) including the population of particles are also presented.

A coated phosphors that include a shell comprising a first Mn 4+ doped phosphor of formula I A x [MF y ]:Mn 4+ I directly disposed on a core comprising a second phosphor. The second phosphor is a material other than a compound of formula I or formula II A x [MF y ]  II wherein A is, independently at each occurrence, Li, Na, K, Rb, Cs, or a combination thereof; M is, independently at each occurrence, Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is the absolute value of the charge of the [MF y ] ion; and y is 5, 6 or 7.

A lighting apparatus includes a semiconductor light source in direct contact with a polymer composite comprising a color stable Mn 4+ doped phosphor, wherein the lighting apparatus has a color shift of ≤1.5 MacAdam ellipses after operating for at least 2,000 hour at a LED current density greater than 2 A/cm 2 , a LED wall-plug efficiency greater than 40%, and a board temperature greater than 25° C.

A population of coated phosphor particles is presented. Each coated phosphor particle has a core including a Mn 4+ doped phosphor and a shell including aluminum oxide, titanium oxide, zirconium oxide, zinc oxide, tin oxide, silicon dioxide, hafnium oxide, indium oxide, indium tin oxide, potassium fluoride, titanium nitride, boron nitride, silicon nitride, a polymer material, or a combination thereof. A process for preparing the population of coated phosphor particles is also presented.