A luminescent component includes a first element comprising a first solid polymer composition, wherein the first solid polymer composition includes first luminescent crystals, wherein the first luminescent crystals are of the perovskite structure, and are selected from compounds of formula (I): M.sup.1.sub.aM.sup.2.sub.bX.sub.c, wherein M.sup.1 represents Cs, optionally doped with up to 30 mol % of one or more other metals having coordination number 12, M.sup.2 represents Pb, optionally doped with up to 30 mol % of one or more other metals having coordination number 6, X independently represents anions selected from the group consisting of Cl, Br, I, cyanide, and thiocyanate. The first luminescent crystals are of size between 3 nm and 3000 nm, and emit light of a first wavelength in response to excitation by light with a wavelength shorter than the first wavelength. An encapsulation including a polymer or an inorganic matrix encloses the first element.

In order to suppress the chromaticity shift and corrosion associated with the deterioration of a sulfide phosphor particle, this phosphor sheet is produced using a phosphor particle-containing resin composition which comprises: covered phosphor particles; polymerizable compound; and a polymerization initiator. The covered phosphor particles are obtained by covering phosphor particles with silicon dioxide films, wherein among the phosphor particles, at least sulfide phosphor particles are covered with silicon dioxide films that contain a metal oxide powder. Thus, the phosphor sheet can be inhibited from emitting a sulfur-based gas, and exhibits a minimized chromaticity shift, even when the phosphor sheet is present in such a manner that the edge of the phosphor layer of the sheet is in an exposed state.

Provided is a wavelength conversion member that can improve the color balance of emitted light. A wavelength conversion member 1 includes a phosphor 2 encapsulated within a glass tube 10, wherein the glass tube 10 includes: a first flat-plate portion 11 and a second flat-plate portion 12 opposed to each other in a first direction (z direction) perpendicular to a longitudinal direction (y direction) of the glass tube 10; and a third flat-plate portion 13 and a fourth flat-plate portion 14 opposed to each other in a second direction (x direction) perpendicular to both the longitudinal direction (y direction) of the glass tube 10 and the first direction (z direction), the first flat-plate portion 11 is located on a light incident side of the glass tube 10 through which excitation light 3 for exciting the phosphor 2 enters the glass tube 10, the second flat-plate portion 12 is located on a light exit side of the glass tube 10 through which fluorescence 4 from the phosphor 2 is emitted from the glass tube 10, at least one of a first corner 21 connecting between the first flat-plate portion 11 and the third flat-plate portion 13 and a second corner 22 connecting between the first flat-plate portion 11 and the fourth flat-plate portion 14 is chamfered.

A light emitting diode including a semiconductor stack including a lower semiconductor layer, an active layer, and an upper semiconductor layer; an upper electrode connected to the upper semiconductor layer and including an electrode pad and extensions extending from the electrode pad; and a lower electrode connected to the lower semiconductor layer. The electrode pad includes a first electrode pad having an elongated shape, disposed along a first side of the upper semiconductor layer, and covering the upper semiconductor layer near the first side of the upper semiconductor layer, and the extensions include an edge extension extending along an edge of the upper semiconductor layer in the electrode pad and surrounding a luminous region and middle extensions extending from the edge extension or the electrode pad and dividing the luminous region into a plurality of luminous regions.

Pixelated array light emitters are formed with closely-spaced pixels having ultra-smooth sidewalls. In methods for making such pixelated array light emitters, a converter layer of phosphor particles dispersed in a binder is disposed on a carrier, and then singulated by saw cuts or similar methods to form an array of phosphor pixels. The binder is fully cured prior to singulation of the converter layer. Further, the carrier is rigid rather than flexible. As a consequence of fully curing the binder and of using a rigid carrier to support the converter layer, singulation results in phosphor pixels having smooth side walls. The array of phosphor pixels is subsequently attached to a corresponding array of LEDs with an adhesive layer, separate from the binder used to form the converter layer. The pixel sidewalls may be formed with controlled morphology, for example at acute or obtuse angles with respect to the carrier.

Disclosed is a curable organopolysiloxane composition, comprising: (A) a curing reactive organopolysiloxane component formed by curing or semi-curing and reacting at least two or more types of organopolysiloxanes in the presence of one or more types of catalysts; and (B) a peroxide. The composition is a non-fluid at 25° C., and the melt viscosity at 100° C. is 8000 Pa.Math.s or lower. A sealing agent comprising the curable organopolysiloxane composition and a cured product of the curable organopolysiloxane composition are also disclosed, along with a method of molding a cured product and a semiconductor device comprising the cured product.

A light-emitting device includes: a package defining a recess; a light-emitting element disposed on a bottom surface of the recess; and a sealing member disposed in the recess so as to cover the light-emitting element. The sealing member includes a filler-containing layer which contains a filler and covers the light-emitting element, and a light-transmissive layer disposed on the filler-containing layer. The recess is further defined by a lateral surface having a stepped portion between the bottom surface of the recess and an opening of the recess. The light-transmissive layer covers the stepped portion. An upper surface of the light-transmissive layer is downwardly recessed.

Provided are a ternary glass composition containing SiO.sub.2, B.sub.2O.sub.3 and ZnO, and a ceramic phosphor plate including a glass frit obtained by vitrification of the glass composition as a matrix and obtained by sintering at least one phosphor.

A wavelength converter may include a phosphor layer and a filter layer where the filter layer may be directly attached to the phosphor layer. The wavelength converter may have an overall thickness ranging from 20 μm to 80 μm.

A light emitting device assembly and methods for preparing a wavelength converter and methods for preparing a light emitting device assembly are also disclosed.

Provided is a wavelength conversion member in which the following are dispersed in a thermoplastic resin: a LuYAG fluorescent material that is represented by (Y.sub.1-α-βLu.sub.αCe.sub.β).sub.3Al.sub.5O.sub.12 (in which α is a positive number between 0.3-0.8 inclusive and β is a positive number between 0.01-0.05 inclusive), that emits yellow-green light as a result of excitation by blue light, and that has a diffraction peak within a range in which the diffraction angle 2θ in X-ray diffraction by the K.sub.α1 line of Cu is 52.9° to 53.2° inclusive; and a KSF fluorescent material that is represented by K.sub.2(Si.sub.1-xMn.sub.x)F.sub.6 (in which x is a positive number between 0.001 and 0.3 inclusive) and that emits red light as a result of excitation by blue light. The content of the KSF fluorescent material in the wavelength conversion member is 1 to 5 times the content of the LuYAG fluorescent material by mass ratio. The wavelength conversion member makes it possible to provide a light-emitting device that has small color deviation, that is suitable as a lighting device, that emits white light, and that has good color rendering properties in a color temperature range of 4,000-6,500K, i.e., the color temperature range from white to daylight color.