An exemplary white light emitting device includes a plurality of LEDs disposed on a substrate, where the LEDs emit blue light at substantially the same correlated color temperature; a first photoluminescence material layer disposed over a first subset of the LEDs; a second photoluminescence material layer disposed over a second subset of the LEDs different from the first subset of the plurality of LEDs, the second photoluminescence material layer separate from the first photoluminescence material layer; and a diffusing layer separate from and disposed over the first and second photoluminescence layers, where the diffusing layer is associated with a plurality of light scattering particles.

The invention relates to Eu.sup.2+-activated phosphors, to a process for the preparation of these compounds, and to phosphor mixtures, light sources and lighting units which comprise the Eu.sup.2+-activated phosphors according to the invention.

Provided is an LED production method that can produce a great number of high-quality LEDs at low production cost. A binder-rich layer is formed on LEDs to increase the adhesiveness between the LEDs and a substrate; a phosphor layer or phosphor-rich layer is formed over the layer with a mask put on the layer; and the phosphor or a mixture of the phosphor and binder on the mask is recovered and reused.

A light emitting diode package includes a light emitting diode which emits a first light having a first color; a body member defining a planar part thereof on which the light emitting diode is mounted, and a side part thereof which is extended upward from the planar part, the planar and side parts defining an inner cavity in which the light emitting diode is disposed; and a filling member which fills the inner cavity and includes a base part in which a plurality of first phosphors is dispersed, the plurality of first phosphors absorbing a portion of the first light and generating a second light having a second color different from the first color. The body member which defines the planar and side parts thereof has a third color different color from the second color, and the body member having the third color absorbs light having the second color.

The present invention relates to a primary particle comprised of a primary matrix material containing a population of semiconductor nanoparticles, wherein each primary particle further comprises an additive to enhance the physical, chemical and/or photo-stability of the semiconductor nanoparticles. A method of preparing such particles is described. Composite materials and light emitting devices incorporating such primary particles are also described.

A light emitting device manufacturing method includes bonding an electrode of a light emitting element to a conductive member of a base. First wavelength conversion particles, second wavelength conversion particles and filling particles are electrodeposited on a surface of the light emitting element to form a wavelength conversion layer in which the filling particles are disposed among the first wavelength conversion particles and the second wavelength conversion particles. The first wavelength conversion particles contain aluminum. The second wavelength conversion particles have surfaces covered with covering material which contains aluminum. The filling particles contain aluminum. The filling particles have particle size smaller than particle sizes of both the first wavelength conversion particles and the second wavelength conversion particles. The filling particles have aspect ratio smaller than aspect ratios of both the first wavelength conversion particles and the second wavelength conversion particles.

A method of fabricating a light-emitting device including the steps of forming a first resin including a phosphor on a light-emitting diode chip mounted on a package body, measuring color coordinates of light emitted by combination of the light-emitting diode chip and the phosphor, correcting the color coordinates by forming a second resin on the first resin, and curing the first resin and the second resin after correcting the color coordinates, in which the first resin is not fully cured before measuring and correcting the color coordinates.

A light emitting apparatus is disclosed. The light emitting apparatus includes a light-transmissive substrate having a top surface and a bottom surface, at least one semiconductor light emitting device disposed on the top surface of the light-transmissive substrate, a reflective part disposed over the semiconductor light emitting device to reflect light from the semiconductor light emitting device toward the light-transmissive substrate, and a first wavelength converter disposed between the light-transmissive substrate and the reflective part.

The present disclosure provides systems for generating tunable white light. The systems include a plurality of LED strings that generate light with color points that fall within blue, yellow/green, red, and cyan color ranges, with each LED string being driven with a separately controllable drive current in order to tune the generated light output.

A method of producing an optoelectronic semiconductor component includes providing a semiconductor body; applying a photoconductive layer on a radiation exit surface of the semiconductor body, wherein the semiconductor body emits electromagnetic radiation during operation; exposing at least one sub-region of the photoconductive layer with electromagnetic radiation generated by the semiconductor body; and depositing a conversion layer on the sub-region of the photoconductive layer by an electrophoresis process.