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.

The invention provides a lighting device (100) comprising: a first solid state light source (10), configured to provide UV radiation (11) having a wavelength selected from the range of 380-420 nm; a second solid state light source (20), configured to provide blue light (21) having a wavelength selected from the range of 440-470 nm; a wavelength converter element (200), wherein the wavelength converter element (200) comprises: a first luminescent material (210), configured to provide upon excitation with the blue light (21) of the second solid state light source (20) first luminescent material light (211) having a wavelength selected from the green and yellow wavelength range, and wherein the first luminescent material excitability for UV radiation (11) is lower than for blue light (21); and a second luminescent material (220), configured to provide upon excitation with the blue light (21) of the second solid state light source (20) second luminescent material light (221) having a wavelength selected from the orange and red wavelength range, and wherein the second luminescent material excitability for UV radiation (11) is lower than for blue light (21).

Compositions are generally provided that include an oxyfluoride compound. In one embodiment, the oxyfluoride compound has the formula: NaCa.sub.2xA.sub.xGeO.sub.4zF.sub.1yN.sub.z where A is Ba, Sr, or a mixture thereof; 0.01x0.1; 0y0.2; and 0z0.1. Methods of forming such compounds are also generally provided.

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.

Proposed is a phosphor capable of effectively inhibiting the occurrence of adverse influence of a sulfur-based gas while improving water resistance of the phosphor and effectively inhibiting the corrosion of a metallic member. A phosphor is proposed, which includes particles or a layer provided on the surface of a sulfur-containing phosphor, which contains sulfur in a host material, and containing a crystalline metal borate containing an IIA-Group element, boron, and oxygen.

A quantum dot microcapsule according to an embodiment of the present invention includes one or more quantum dots each including a ligand coupled to an outer circumferential surface thereof, the ligand being made of an organic material, and a microcapsule accommodating the one or more quantum dots. The microcapsule includes an oil or a solvent with the quantum dots dispersed therein. There are effects capable of not only effectively adjusting a density of quantum dots through formation of a microcapsule formed to include one or more quantum dots and filled with an oil, but also effectively protecting ligands of the quantum dots from an environment such as oxygen, moisture or the like, against which the ligands are weak.