Abstract: A light conversion device is disclosed. The light conversion device includes a substrate and a wavelength conversion element (111). The wavelength conversion element (111) includes an inorganic binder, such as sodium silicate. Also disclosed are phosphor wheels and light engines including such phosphor wheels. Further disclosed are high-power laser projection display systems comprising a laser having a power of from about 60 W and about 300 W and a light conversion device. The use of an inorganic binder permits high thermal stability at reasonable cost.

Abstract: A combination wheel is disclosed, which comprises a color filter, a reflective substrate coaxially aligned with and on a surface of the color filter, light-emitting phosphor segments of different colors on the reflective substrate, and a diffuser segment. When used with a blue laser generator and a series of a dichroic filters and mirrors, the combination wheel tunes and convert lights to be collected by a subsequent optical system.

Abstract: A white light source comprises a luminescent layer comprising a phosphor and light scattering material disposed in a binder, and a light source arranged to illuminate the luminescent layer with blue light. The white light source outputs white light comprising converted phosphor emission light from the phosphor illuminated by the blue light and unconverted scattered blue light that is scattered by the light scattering material. The unconverted scattered blue light has a spatial distribution matching a spatial distribution of the converted phosphor emission light. In some embodiments the spatial distributions are approximately Lambertian spatial distributions. The white light source may comprise a phosphor wheel including a disk-shaped substrate on which the luminescent layer is disposed as a phosphor ring. The phosphor ring may comprise the phosphor and light scattering material disposed in the binder with uniform composition around the annulus of the phosphor ring.

Abstract: A phosphor wheel (300, 400, 500, 600) includes an annular disc (310, 410, 510, 610) having phosphor segments (320, 420, 522, 524, 620) and an exposed annular sector (305, 405, 505, 605), a hub (330, 430, 530, 630) coupled to the inner perimeter (304, 413) of the annular disc, and a balancing piece (340, 440, 540, 640) located between the hub and the exposed annular sector. The balancing piece minimizes the initial imbalance of the phosphor wheel about the center (301, 441, 541) of the disc due to the exposed annular sector by making up the difference in torque. A method for making a phosphor wheel, a projector comprising a phosphor wheel, and a method for minimizing imbalance in a phosphor wheel.

Abstract: Light tunnels, methods for forming a light tunnel, and apparatuses including light tunnels are disclosed herein. A light tunnel includes a plurality of reflectors cooperatively engaging with one another by a series of notches therein. The inner edges of the reflectors are chamfered to improve ease of assembly and decrease chipping of the edges during assembly. An adhesive can be applied at junctions between the reflectors on their outer surfaces. This construction eliminates or retards light leakage and adhesive leakage.