A method for preparing a wavelength converting film is disclosed. The method comprising mixing at least one phosphor, a polysiloxane and optionally an organic solvent, thereby preparing a mixture, placing the mixture on a substrate, pre-curing the mixture on the substrate, thereby preparing a wavelength converting film. Furthermore, a wavelength converting film is disclosed, a method for preparing a light-emitting device and a light-emitting device.

A strongly scattering optoceramic converter material having a density of less than 97% is provided, as well as a method for producing such an optoceramic material. By appropriately choosing in particular the composition, blending method, and sintering conditions, the production method permits to produce converter materials with tailored properties.

Provided are a device and a method for synthesis of a gallium-containing garnet-structured scintillator polycrystalline material. The synthesis device includes a polycrystalline material synthesis chamber (7) made of a thermal insulation material (1); a crucible (3) arranged at the center of the bottom of the polycrystalline material synthesis chamber; an induction coil (2) annularly arranged outside the polycrystalline material synthesis chamber at a position with a height corresponding to that of the crucible; an arc heating device (4) arranged on a central axis of the induction coil in the polycrystalline material synthesis chamber, so as to heat and melt raw materials at the center of the crucible by means of the high temperature generated by arc discharge; the induction coil is connected to a RF induction power supply.

An article comprising a luminescent nanoparticle is described, wherein the luminescent nanoparticle is selected from the group consisting of oxide nanoparticles, aluminate nanoparticles, and germanate nanoparticles; and wherein the luminescent nanoparticle is doped with one or more metals or rare-earth elements. A method of making a luminescent nanoparticle is also described, the method comprising the steps of: providing a nanoparticle, doping the nanoparticle with one or more chemical elements, heating the nanoparticle to a temperature of between about 1000° C. and about 1200° C. to alter the crystal structure of the nanoparticle and/or to create oxygen vacancies in the nanoparticle. A persistent luminescent nanoparticle is described, said persistent luminescent nanoparticle being selected from the group consisting of: LaAlO.sub.3 nanoparticles, Gd.sub.2O.sub.3 nanoparticles, SrAl.sub.2O.sub.4 nanoparticles, Y.sub.2O.sub.3 nanoparticles, and combinations thereof; wherein the nanoparticle is doped with about 1% or less of a chemical element selected from the group consisting of: holmium, europium, ytterbium, neodymium, magnesium, and combinations thereof.

To provide a light emitting device that has an excellent color rendering property and a high light emission efficiency, and a lightening fixture provided with the same. A light emitting device including a light emitting element having a light emission peak wavelength in a range of 430 nm or more and 470 nm or less, and a fluorescent member including two or more kinds of rare earth aluminate fluorescent materials including at least one kind selected from the group consisting of a first fluorescent material having a composition represented by the following formula (I) (Y.sub.3(Al,Ga).sub.5O.sub.12:Ce), a second fluorescent material having a composition represented by the following formula (II) (Lu.sub.3Al.sub.5O.sub.12:Ce), and a third fluorescent material having a composition represented by the following formula (III) (Y.sub.3Al.sub.5O.sub.12:Ce), a fourth fluorescent material having a composition represented by the following formula (IV) (A.sub.2[M1.sub.1-pMn.sup.4+.sub.pF.sub.6]), and a fifth fluorescent material having a composition represented by the following formula (V) ((Sr,Ca)AlSiN.sub.3:Eu).

A light emitting filament diode that includes a filament substrate; a plurality of light emitting diodes (LEDs) electrically connected and disposed along a length of the filament substrate; and a phosphorus encapsulant present in direct contact with an upper surface and sidewalk of at least one of the plurality of light emitting diodes (LEDs). No portion of phosphorus encapsulant is present overlying a portion of the filament substrate extending between the sidewalls of adjacently situated light emitting diodes having phosphorus encapsulant present thereon. The light emitting filament diode may a include a transparent encapsulant present over at least the light emitting diode chips.

A light emission device including a light emitting element having a light emission peak wavelength in a range of 400 nm or more and 490 nm or less; and a fluorescent member including a first fluorescent material having a light emission peak wavelength in a range of 510 nm or more and less than 580 nm, a second fluorescent material having a light emission peak wavelength in a range of 580 nm or more and 680 nm or less and a full width at half maximum of 15 nm or more and 100 nm or less, and a third fluorescent material having a light emission peak wavelength in a range of 600 nm or more and 650 nm or less and a full width at half maximum of 14 nm or less, and having a melanopic ratio (MR) value in a specified range at a certain correlated color temperature.

A ceramic scintillator according to the present embodiment has a composition represented by (Lu.sub.1-xPr.sub.x) .sub.a (Al.sub.1-yGa.sub.y) .sub.bO.sub.12, wherein x, y, a, and b in the composition respectively satisfy 0.005≤x≤0.025, 0.3≤y≤0.7, 2.8≤a≤3.1, and 4.8≤b≤5.2.

Codoped lutetium-based oxyorthosilicate scintillators (e.g., lutetium oxyorthosilicase (LSO) and lutetium-ytrrium oxyorthosilicate (LYSO) scintillators) codoped with transition metal ions (e.g., Cu.sup.2+) are described. The codoping can alter one or more optical and/or scintillation property of the scintillator material. For example, the codoping can increase scintillation light yield and/or decrease scintillation decay time. Radiation detectors comprising the scintillators, methods of detecting high energy radiation using the radiation detectors, and methods of altering one or more scintillation and/or optical properties of a lutetium-based oxyorthosilicate scintillator are also described.

A phosphor, wherein the phosphor has a formula:

.sup.VIII(Y.sub.1-x-z-w,Lu.sub.z,Gd.sub.w,Ce.sub.x).sub.3.sup.VI(Al.sub.1-yMn.sub.y).sub.2.sup.IV(Al.sub.1-2y/3,Si.sub.2y/3).sub.3O.sub.12,

wherein
0<x≤0.05,
0<y≤0.04,
0<x+z<1,
0≤w≤0.50 when z≠0,
0≤w≤0.35 when z=0, and
0<x+z+w≤1, is described. Furthermore, a light-emitting device and methods for preparing the phosphor and the light-emitting device are described.