A light emitting device includes: a first white light source which includes N pieces of first white light emitting diodes and emits a first white light; and a second white light source which includes M pieces of second white light emitting diodes and a first resistance element electrically connected in series to the second white light emitting diodes and having a first resistance value, is electrically connected in parallel to the first white light source, and emits a second white light, the light emitting device emitting a mixed white light of the first white light and the second white light. The drive voltage of the first white light source is higher than a drive voltage of the second white light source, and a color temperature of the mixed white light is higher as a total luminous flux of the mixed white light is higher.

A light emitting device includes: a first white light source which includes N pieces of first white light emitting diodes and emits a first white light; and a second white light source which includes M pieces of second white light emitting diodes and a first resistance element electrically connected in series to the second white light emitting diodes and having a first resistance value, is electrically connected in parallel to the first white light source, and emits a second white light, the light emitting device emitting a mixed white light of the first white light and the second white light. The drive voltage of the first white light source is higher than a drive voltage of the second white light source, and a color temperature of the mixed white light is higher as a total luminous flux of the mixed white light is higher.

The invention relates to an illuminating device (1) comprising a substrate (2), a non-transparent spacer (4) which is connected to the substrate (2) so as to be hermetically sealed, an opening in the spacer (4), opposite said substrate (2), and an illumination element (3) positioned beneath the spacer (4) and beneath the opening, which element is connected to the substrate (2) so as to be hermetically sealed, characterized in that the opening in the spacer (4) is closed, so as to be hermetically sealed, by an optical element (5) consisting of a glass material the volume of which comprises at least one luminophore and thus constitutes a luminescent composite glass material.

A scintillator panel includes at least one light emitting layer and at least one non-light emitting layer laminated, wherein the light emitting layer contains phosphor particles, and when the thickness of the light emitting layer is represented by A, a relationship among a cumulative 50% particle diameter D.sub.50 of the phosphor particles based on volume average, a cumulative 90% particle diameter D.sub.90 of the phosphor particles based on volume average, and the thickness A satisfies,

D.sub.50<A and D.sub.90<2A.

Disclosed are a phosphor, in particular, a red light emitting phosphor, a method for producing the same and a light emitting device package including the same. Provided is a red light emitting phosphor emitting light having a main absorption band in a blue wavelength range and a main peak in a red wavelength range, the red light emitting phosphor being represented by the following Formula 1.
(Sr.sub.1xEu.sub.x)Lu.sub.2O.sub.4[Formula 1]

A lighting apparatus for emitting white light including a semiconductor light source emitting radiation with a peak emission between from about 250 nm to about 500 nm and a first phosphor having a peak emission between about 550 and 615 nm, wherein an overall emission spectrum of the lighting apparatus has a depression between about 550 and 615 nm, whereby the red-green color contrast is increased versus a reference illuminant.

A light emitting device includes: a first white light source which includes N pieces of first white light emitting diodes and emits a first white light; and a second white light source which includes M pieces of second white light emitting diodes and a first resistance element electrically connected in series to the second white light emitting diodes and having a first resistance value, is electrically connected in parallel to the first white light source, and emits a second white light, the light emitting device emitting a mixed white light of the first white light and the second white light. The drive voltage of the first white light source is higher than a drive voltage of the second white light source, and a color temperature of the mixed white light is higher as a total luminous flux of the mixed white light is higher.

A phosphor for low-pressure discharge lamps is disclosed, wherein the phosphor is present in the form of phosphor grains coated with a protective layer, wherein the protective layer consists of a metal oxide, a metal borate, a metal phosphate or mixtures thereof.

In different embodiments, a low-pressure discharge lamp (1) is provided. The low-pressure discharge lamp has a discharge vessel (2) and a coating structure (7). The coating structure is formed on an inner face of the discharge vessel (2). The coating structure (7) has first fluorescent particles (34) which have at least one fluorescent substance that emits red light and the average particle size of which ranges from 0.5 m to 1.9 m, second fluorescent particles (36) which have at least one fluorescent substance that emits green light and the average particle size of which ranges from 0.6 m to 2.8 m or from 1 m to 4 m, and third fluorescent particles (38) which have at least one fluorescent substance that emits blue light and the average particle size of which ranges from 1 m to 4 m.

There is provided a method of making luminescent nanoparticles of the type A2-xO3:Lnx, wherein A is one or more of yttrium, scandium, aluminium, gallium, or a lanthanide; Ln is at least one lanthanide; and 0<x<2, said method comprising:providing a first mixture comprising at least a salt of A, a salt of Ln, and a solvent,providing a second mixture comprising a precipitating agent and a solvent,contacting said first mixture with said second mixture in a microjet reactor process to obtain a third mixture comprising nanoparticles, andsubjecting said nanoparticles to a heating step. There is also provided compositions and applications comprising the nanoparticles obtainable by the method.