A garnet is doped with a lanthanide ion selected from praseodymium, gadolinium, erbium, and neodymium. For co-doping, at least two of the lanthanide ions are selected. The lanthanide ion doped garnet converts electromagnetic radiation energy of a longer wavelength of below 530 nm to electromagnetic radiation energy of shorter wavelengths in the range of 220 to 425 nm. The garnet is crystalline and is obtainable from a mixture of salts or oxides of the components, in the presence of a chelating agent, that are dissolved in acid. This is followed by a specific calcination process to produce the garnet and, optionally, to adjust particle size and increase the crystallinity of the particles. The garnet can be used to inactivate microorganisms or cells covering a surface containing silicate-based material under exposure of electromagnetic radiation energy of a longer wavelength of below 500 nm.

The invention relates to an inorganic scintillator material of formula Lu .sub.(2−y) Y .sub.(y−z−x) Ce.sub.xM.sub.zSi.sub.(1−v) M′ .sub.vO.sub.5, in which:

M represents a divalent alkaline earth metal and

M′ represents a trivalent metal,

(z+v) being greater than or equal to 0.0001 and less than or equal to 0.2;

z being greater than or equal to 0 and less than or equal to 0.2;

v being greater than or equal to 0 and less than or equal to 0.2;

x being greater than or equal to 0.0001 and less than 0.1; and

y ranging from (x+z) to 1.

In particular, this material may equip scintillation detectors for applications in industry, for the medical field (scanners) and/or for detection in oil drilling. The presence of Ca in the crystal reduces the afterglow, while stopping power for high-energy radiation remains high.

An image detector for a radiation-based imaging technique is disclosed. The image detector may comprise a detector material on a substrate. The detector material may be an optically active material represented by the following formula (I) (M′).sub.8 (M″M′″).sub.6O.sub.24(X,X′).sub.2:M″″ Further is disclosed the use of the image detector and the use of the optically active material represented by the formula (I).

A phosphor, wherein the phosphor has a formula:

.sup.VIII(Y.sub.1-x-z-w,Lu.sub.z,Gd.sub.w,Ce.sub.x).sub.3.sup.VI(Al.sub.1-yMn.sub.y).sub.2.sup.IV(Al.sub.1-2y/3,Si.sub.2y/3).sub.3O.sub.12,

wherein
0<x≤0.05,
0<y≤0.04,
0<x+z<1,
0≤w≤0.50 when z≠0,
0≤w≤0.35 when z=0, and
0<x+z+w≤1, is described. Furthermore, a light-emitting device and methods for preparing the phosphor and the light-emitting device are described.

The phosphor has a broad excitation band provided by Ce.sup.3+ in an excitation spectrum. The excitation band has a peak in a range between 400 nm and 470 nm inclusive. The phosphor has, as an emission spectrum, a broad emission component provided by Ce.sup.3+ which has an emission peak wavelength of 510 nm or more to less than 570 nm and a linear emission component provided by Tb.sup.3+ which has an emission peak wavelength of 535 nm or more to less than 560 nm. The intensity of the emission spectrum shows the maximum at the wavelength of the linear emission component provided by Tb.sup.3+.

A curable composition, for production of coatings with an antimicrobial property, contains at least one film-forming polymer, at least one up-conversion phosphor, optionally at least one additive, and optionally at least one curing agent. The phosphor is selected from the idealized general formula (1), Lu.sub.3-a-b-nLn.sub.b(Mg.sub.1-zCa.sub.z).sub.aLi.sub.n(Al.sub.1-u-vGa.sub.uSc.sub.v).sub.5-a-2n(Si.sub.1-d-eZr.sub.dHf.sub.e).sub.a+2nO.sub.12, where a=0-1, 1≥b>0, d=0-1, e=0-1, n=0-1, z=0-1, u=0-1, v=0-1; with u+v≤1 and d+e≤1; Ln=praseodymium (Pr), gadolinium (Gd), erbium (Er), neodymium (Nd), or yttrium (Y); Lu=lutetium; and Li=lithium.

A lighting device for adjusting the color temperature of white light emitted by a luminescent material is disclosed. The lighting device comprises: a luminescent material configured to emit white light when being exposed to electromagnetic radiation of a preselected wavelength range; at least one excitation unit configured to expose the luminescent material to electromagnetic radiation of a first wavelength range selected from the range of 230-330 nm; at least one excitation unit configured to expose the luminescent material to electromagnetic radiation of a second wavelength range, different from the first wavelength range, selected from the range of 300-600 nm; a metering unit configured to adjust the ratio of the irradiances of electromagnetic radiation of first wavelength range and of electromagnetic radiation of second wavelength range that is exposed on the luminescent material.

A glass having from greater than or equal to about 0.1 mol. % to less than or equal to about 20 mol. % Ho.sub.2O.sub.3, and one or more chromophores selected from V, Cr, Mn, Fe, Co, Ni, Se, Pr, Nd, Er, Yb, and combinations thereof. The amount of Ho.sub.2O.sub.3 (mol. %) is greater than or equal to 0.7 (CeO.sub.2 (mol. %)+Pr.sub.2O.sub.3 (mol. %)+Er.sub.2O.sub.3 (mol. %)). The glass can include one or more fluorescent ions selected from Cu, Sn, Ce, Eu, Tb, Tm, and combinations thereof in addition to, or in place of the chromophores. The glass can also include multiple fluorescent ions.

A lighting device for adjusting the color temperature of white light emitted by a luminescent material is disclosed. The lighting device comprises: a luminescent material configured to emit white light when being exposed to electromagnetic radiation of a preselected wavelength range; at least one excitation unit configured to expose the luminescent material to electromagnetic radiation of a first wavelength range selected from the range of 230-330 nm; at least one excitation unit configured to expose the luminescent material to electromagnetic radiation of a second wavelength range, different from the first wavelength range, selected from the range of 300-600 nm; a metering unit configured to adjust the ratio of the irradiances of electromagnetic radiation of first wavelength range and of electromagnetic radiation of second wavelength range that is exposed on the luminescent material.

The invention relates to an inorganic scintillator material of formula Lu.sub.(2−y)Y.sub.(y−z−x)Ce.sub.xM.sub.zSi.sub.(1−v)M′.sub.vO.sub.5, in which: M represents a divalent alkaline earth metal and M′ represents a trivalent metal, (z+v) being greater than or equal to 0.0001 and less than or equal to 0.2; z being greater than or equal to 0 and less than or equal to 0.2; v being greater than or equal to 0 and less than or equal to 0.2; x being greater than or equal to 0.0001 and less than 0.1; and y ranging from (x+z) to 1.

In particular, this material may equip scintillation detectors for applications in industry, for the medical field (scanners) and/or for detection in oil drilling. The presence of Ca in the crystal reduces the afterglow, while stopping power for high-energy radiation remains high.