A fiber light source includes a solid-state light source, a wavelength convertor, and an optical fiber. The solid-state light source is configured to emit first light, the first light including blue light with a peak wavelength in a range of 430 to 470 nm, inclusive, and green light with a peak wavelength in a range of 480 to 550 nm, inclusive. The wavelength convertor is disposed on the light output side or the light incident side of the optical fiber and contains a red phosphor. The red phosphor includes Ce as a luminescent center, and is excited by at least part of the green light to emit second light. The second light has a spectrum with a peak wavelength in a range of 600 to 700 nm, inclusive. The red phosphor contains a nitride or an oxynitride as a host material.

A projector includes a light source unit, a spatial light modulator configured to control light from the light source unit for each pixel to form an optical image, and a projection optical system configured to project the optical image formed by the spatial light modulator onto a target. The light source unit includes a solid-state light source and a wavelength convertor. The solid-state light source is configured to emit first light, the first light including blue light with a peak wavelength in a range of 430 to 470 nm, inclusive, and green light with a peak wavelength in a range of 480 to 550 nm, inclusive. The wavelength convertor contains a red phosphor including Ce as a luminescent center that is configured to emit second light upon receiving the green light. The second light has a spectrum with a peak wavelength of 600 to 700 nm, inclusive. The red phosphor contains a nitride or an oxynitride as a host material.

A phosphor, which is represented by the general formula containing M, Ce, Pr, Si, and N, is provided. M is at least one element selected from the group consisting of La, Y, Tb and Lu. A molar ratio of M is greater than 2.0 and smaller than 3.5. A molar ratio of Ce is greater than 0 and smaller than 1.0. A molar ratio of Pr is greater than 0 and smaller than 0.05. A molar ratio of N is greater than 10 and smaller than 12, under the condition that a molar ratio of Si is set to 6. The phosphor further contains 10 to 10,000 ppm of fluorine.

A phosphor having a formula of T.sub.xE.sub.ySi.sub.zN.sub.rTb.sub.aL.sub.bM.sub.c is provided, in which T is Mg, Ca, Sr or Ba; E is Mg, Ca, Ba, Ti, Cu, Zn, B, Al, In, Sn, Sb, Bi, Ga, Y, La or Lu; L is Li, Na or K; M is Ce, Pr, Nd, Pm, Sm, Gd, Dy, Ho, Er, Tm, Yb or Mn; and 1.4x2.6, 0y0.5, 4.3z5.6, 7.4r9, 0.01a0.5, 0b0.5, 0c0.5, in which Tb ion is used as a luminescence center, and valence of the Tb ion is lower than 3+, and the phosphor is excited by an excitation light and has an emission band with a full width at half maximum greater than 50 nm. A method of forming the phosphor is also provided.

The present invention related to a nitride phosphor represented by the following general formula (1), the nitride phosphor having an x value of less than 0.43 in luminescent color coordinates (x, y) upon being excited with excitation light of 455 nm, and a reflectance Ra of 89% or more at 770 nm;
Ln.sub.xSi.sub.yN.sub.n:Z(1),
wherein Ln is a rare-earth element excluding the element used as an activator, Z is an activator, x satisfies 2.7x3.3, y satisfies 5.4y6.6, and n satisfies 10n12.

The phosphor according to an aspect of the present disclosure contains a crystal phase having a chemical composition Ce.sub.xY.sub.yLa.sub.3-x-ySi.sub.6N.sub.11, where x and y satisfy 0<x0.6, and (1.5x)y(3x). The phosphor has an emission spectral peak within a wavelength range of 600 nm or more and 660 nm or less and a first excitation spectral peak within a wavelength range of 480 nm or more and 550 nm or less.

A phosphor having a formula of T.sub.xE.sub.ySi.sub.zN.sub.rTb.sub.aL.sub.bM.sub.c is provided, in which T is Mg, Ca, Sr or Ba; E is Mg, Ca, Ba, Ti, Cu, Zn, B, Al, In, Sn, Sb, Bi, Ga, Y, La or Lu; L is Li, Na or K; M is Ce, Pr, Nd, Pm, Sm, Gd, Dy, Ho, Er, Tm, Yb or Mn; and 1.4x2.6, 0y0.5, 4.3z5.6, 7.4r9, 0.01a0.5, 0b0.5, 0c0.5, in which Tb ion is used as a luminescence center, and valence of the Tb ion is lower than 3+, and the phosphor is excited by an excitation light and has an emission band with a full width at half maximum greater than 50 nm. A method of forming the phosphor is also provided.

The invention provides a light generating system (1000) comprising (i) a plurality of light sources (110,120, . . .), (ii) a first luminescent material (210), and (iii) a second luminescent material (220), wherein: (a) a first light source (110) is configured to generate first light source light (111) having one or more wavelengths in the blue wavelength range and having a first centroid wavelength (C1), wherein the first light source (110) is a laser; (b) the first luminescent material (210) is configured to convert at least part of the first light source light (111) into first luminescent material light (211) having one or more wavelengths in the green and/or yellow wavelength range; (c) a second light source (120) is configured to generate second light source light (121) having one or more wavelengths in the yellow and/or orange wavelength range and having a second centroid wavelength (C2), wherein C2>C1; wherein the second light source (120) is a superluminescent diode; (d) the second luminescent material (220) is configured to convert at least part of the second light source light (121) into second luminescent material light (221) having one or more wavelengths in the orange and/or red wavelength range; and (e) in an operational mode the light generating system (1000) is configured to generate system light (1001) comprising the first luminescent material light (211) and the second luminescent material light (221).

The Invisible Inimitable Identity, Provenance, Verification and Authentication 7,70 Identifier System is an invisible or visible identifying embodiment having multiple machine readable emission output wavelengths and phosphorescence decay lifetimes generated from crystals contained in the embodiment when subjected to an incident energy source(s), the spatial distribution of the crystals limited only to the embodiment boundary. Comparison of the resulting spectral information histogram, using a preselected percentage of the decay lifetimes, against a database containing the embodiment's pre-established information verifies an item's identity and validates it as authentic. The system provides real-time verification for OEM parts and other items rapidly determining if the part or item is, in fact, an actual OEM item thus providing compliance to SAE Aerospace Standard AS6081. The 7,70 Identifier System provides a cost effective means of counterfeit part avoidance providing in excess of one billion individual unique identities.

The invention provides a light generating system (1000) comprising (i) a plurality of light sources (110, 120, . . . ), (ii) a first luminescent material (210), and (iii) a second luminescent material (220), wherein: (a) a first light source (110) is configured to generate first light source light (111) having one or more wavelengths in the blue wavelength range and having a first centroid wavelength (C1), wherein the first light source (110) is a laser; (b) the first luminescent material (210) is configured to convert at least part of the first light source light (111) into first luminescent material light (211) having one or more wavelengths in the green and/or yellow wavelength range; (c) a second light source (120) is configured to generate second light source light (121) having one or more wavelengths in the yellow and/or orange wavelength range and having a second centroid wavelength (C2), wherein C2>C1; wherein the second light source (120) is a superluminescent diode; (d) the second luminescent material (220) is configured to convert at least part of the second light source light (121) into second luminescent material light (221) having one or more wavelengths in the orange and/or red wavelength range; and (e) in an operational mode the light generating system (1000) is configured to generate system light (1001) comprising the first luminescent material light (211) and the second luminescent material light (221).