The invention provides a lighting device configured to provide red lighting device light, the lighting device comprising: (i) a first light source configured to provide first light source light having a peak wavelength (λls); (ii) a first red luminescent material configured to absorb at least part of the first light source light and to convert into first red luminescent material light having a first red emission peak wavelength (λm1), the first red luminescent material having an excitation maximum (λx1); (iii) a second red luminescent material configured to absorb at least part of the first light source light and to convert into second red luminescent material light having a second red emission peak wavelength (λm2), the second red luminescent material having a second excitation maximum (λx2); and wherein the first luminescent material and the second luminescent material are Eu2+ based, and wherein λm1<λm2, λx1<λls and λx2>λls.

A glass material is provided, which has a composition of M.sub.2O—ZnO-M′.sub.20.sub.3—Bi.sub.2O.sub.3—SiO.sub.2, wherein M is Li, Na, K, or a combination thereof, and M′ is B, Al, or a combination thereof. A fluorescent composite material can be composed of the glass material and a phosphor material. The fluorescent composite material may collocate with an excitation light source to provide a light-emitting device.

A fluorescent material comprises a compound having the general formula of:

[Lu.sub.1−a−c−d−2/3bY.sub.aΣ(Ln−1).sub.cΣ(Ln−2).sub.dM.sub.b].sub.3±δ[Al.sub.1−xGa.sub.x].sub.5(O.sub.1−1/2yX.sub.y).sub.12±1.5δ.

The fluorescent material is combined with other compounds to form a photo-luminescent composition. The fluorescent material and the composition containing the same have a lot of advantages, such as high brightness, high color rendering index, high stability, and low light decay.

A method of manufacturing a light emitting device includes providing a package; disposing a light emitting element in a recess of the package; injecting a sealing material in the recess, the sealing material including fluorescent material particles and a binder, the fluorescent material particles including particles of fluoride fluorescent material that include a surface region and an inner region, both the surface region and the inner region having a composition including: tetravalent manganese ions, at least one element or compound selected from the group consisting of alkali metal elements and NH.sub.4.sup.+, and at least one element selected from the group consisting of Group 4 and Group 14 elements; sedimenting centrifugally the fluorescent material particles toward a bottom surface in the recess to form a sealing member that comprises a first sealing member portion and a second sealing member portion; and curing the binder to form a cured sealing member.

A white light-emitting device includes a light-emitting element that emits a blue light, and a sealing resin that seals the light-emitting element and that includes a first phosphor and a second phosphor, the first phosphor wavelength-converting a portion of the blue light and emitting a red light, the second phosphor wavelength-converting a portion of the blue light and emitting a green light. The white light-emitting device emits a white light by mixing the blue, red and green lights. The sealing resin further includes a third phosphor that wavelength-converts a portion of the blue light, emits a light in a same color gamut as the first or second phosphor, and has a higher light conversion efficiency than the first or second phosphor. The third phosphor is included in the sealing resin at an additive amount less than an amount that causes a change in a spectrum of the white light.

Phosphors include a CaAlSiN.sub.3 family crystal phase, wherein the CaAlSiN.sub.3 family crystal phase comprises at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb.

A wavelength converting member includes silica glass and a plurality of fluorescent material particles including an oxynitride or nitride fluorescent material and dispersed in the silica glass. The plurality of fluorescent material particles include at least two kinds of fluorescent material particles including (i) first fluorescent material particles that emit a fluorescence having a first peak wavelength and (ii) second fluorescent material particles that emit a fluorescence having a second peak wavelength. The wavelength converting member has a density within a range from 0.8 g/cm.sup.3 to 1.2 g/cm.sup.3.

An optoelectronic component and a method for producing an optoelectronic component are disclosed. In an embodiment an optoelectronic component includes a semiconductor layer sequence having an active region configured to emit radiation at least via a main radiation exit surface during operation and a self-supporting conversion element arranged in a beam path of the semiconductor layer sequence, wherein the self-supporting conversion element includes a substrate and subsequently a first layer, wherein the first layer includes at least one conversion material embedded in a matrix material, wherein the matrix material includes at least one condensed sol-gel material, wherein the condensed sol-gel material has a proportion between 10 and 70 vol % in the first layer, and wherein the substrate is free of the sol-gel material and the conversion material and mechanically stabilizes the first layer.

A wavelength converter is provided with a light-transmitting substrate and with a thin film that is formed on a surface of the light-transmitting substrate and that contains a phosphor. A sintered body that constitutes the light-transmitting substrate has an average particle size of 5-40 μm. The light-transmitting substrate contains at least 10-500 ppm by mass of MgO. The principal component of the phosphor is an α-sialon that is indicated by the general formula (Ca.sub.α,Eu.sub.β) (Si,Al).sub.12(O,N).sub.16 (provided that 1.5<α+β<2.2, 0<β<0.2, and O/N≦0.04).

A method for producing β-sialon fluorescent material having excellent emission intensity is provided. The method for producing β-sialon fluorescent material includes providing a composition comprising silicon nitride that contains aluminium, an oxygen atom, and europium, heat treating the composition, contacting the heat-treated composition with a basic substance, and washing the composition, which has been contacted with the basic substance, with an acidic liquid medium.