Quantum dot semiconductor nanoparticle compositions that incorporate ions such as zinc, aluminum, calcium, or magnesium into the quantum dot core have been found to be more stable to Ostwald ripening. A core-shell quantum dot may have a core of a semiconductor material that includes indium, magnesium, and phosphorus ions. Ions such as zinc, calcium, and/or aluminum may be included in addition to, or in place of, magnesium. The core may further include other ions, such as selenium, and/or sulfur. The core may be coated with one (or more) shells of semiconductor material. Example shell semiconductor materials include semiconductors containing zinc, sulfur, selenium, iron and/or oxygen ions.

According to one embodiment, there is provided a white light source system including white light sources. An absolute value of a difference between (P()V())/(P(max1)V(max1)) and (B()V())/(B(max2)V(max2)) for each of the white light sources satisfies a relational expression represented by
|((P()V())/(P(max1)V(max1))(B()V())/(B(max2)V(max2))|0.15 The white light source system has a light emission characteristic of white light emitted by the system is continuously changed along with an elapse of time by changing a mixing ratio of light beams from the white light sources.

According to one embodiment, there is provided a white light source system including white light sources. An absolute value of a difference between (P()V())/(P(max1)V(max1)) and (B()V())/(B(max2)V(max2)) for each of the white light sources satisfies a relational expression represented by
|((P()V())/(P(max1)V(max1))(B()V())/(B(max2)V(max2))|0.15 The white light source system has a light emission characteristic of white light emitted by the system is continuously changed along with an elapse of time by changing a mixing ratio of light beams from the white light sources.

This invention provides an orange-yellow-emitting phosphor, the preparation method and the use thereof. This orange-yellow-emitting phosphor has a general formula represented by formula I:
Sr.sub.9abxM.sub.aMg.sub.1.5+b(PO.sub.4).sub.7:xEu.sup.2+formula I
wherein in formula I, said M is one or two of Ca and Ba; and 0.001x0.9, 0a1.0, 0b2.3. This orange-yellow-emitting phosphor uses a phosphate as the host material and Eu.sup.2+ ions as activation ions. The chemical properties of the phosphor are stable. The phosphor has relatively wide excitation band and emission band. And the red component in its emission spectrum is abundant, therefore, coupling the blue InGaN chip with the orange-yellow-emitting phosphor provided by this invention can obtain warm white light. The phosphor is radiation free, therefore, it will not be harmful to the environment. It is indicated by experimental results that this orange-yellow-emitting phosphor can be effectively excited by light at a wavelength of 250-500 nm and emits a wide peak at 470-850 nm, wherein the main emission peaks lie at about 523 nm and 620 nm. This preparation method is simple, and the cost is relatively low, so it is amenable to industrial production.

This invention provides an orange-yellow-emitting phosphor, the preparation method and the use thereof. This orange-yellow-emitting phosphor has a general formula represented by formula I:
Sr.sub.9abxM.sub.aMg.sub.1.5+b(PO.sub.4).sub.7:xEu.sup.2+formula I
wherein in formula I, said M is one or two of Ca and Ba; and 0.001x0.9, 0a1.0, 0b2.3. This orange-yellow-emitting phosphor uses a phosphate as the host material and Eu.sup.2+ ions as activation ions. The chemical properties of the phosphor are stable. The phosphor has relatively wide excitation band and emission band. And the red component in its emission spectrum is abundant, therefore, coupling the blue InGaN chip with the orange-yellow-emitting phosphor provided by this invention can obtain warm white light. The phosphor is radiation free, therefore, it will not be harmful to the environment. It is indicated by experimental results that this orange-yellow-emitting phosphor can be effectively excited by light at a wavelength of 250-500 nm and emits a wide peak at 470-850 nm, wherein the main emission peaks lie at about 523 nm and 620 nm. This preparation method is simple, and the cost is relatively low, so it is amenable to industrial production.

A device including an LED light source optically coupled to a phosphor material including a green-emitting phosphor selected from the group consisting of compositions (A1)-(A62) and combinations thereof.

A cadmium-free, core shell quantum dot, a quantum dot polymer composite, and electronic devices including the quantum dot polymer composite. The core shell quantum dot has an extinction coefficient per gram of greater than or equal to 0.3, an ultraviolet-visible absorption spectrum curve that has a positive differential coefficient value at 450 nm, wherein the core shell quantum dot includes a semiconductor nanocrystal core including indium and phosphorus, and optionally zinc, and a semiconductor nanocrystal shell disposed on the semiconductor nanocrystal core, the shell including zinc, selenium, and sulfur, wherein the core shell quantum dot has a quantum efficiency of greater than or equal to about 80%, and is configured to emit green light upon excitation.

An LED illuminating device and a preparation method therefor. The device is characterized by comprising an LED component (101), an LED circuit board (100), a heat dissipator (200), and a power supply controller (400). The LED component (101) is disposed on the LED circuit board (100), the LED circuit board (100) is disposed above the heat dissipator (200), and the power supply controller (400) is connected to the LED circuit board (100) by means of a conductive wire. The LED illuminating device can emit approximate natural light.

A device including an LED light source optically coupled to a green-emitting U.sup.6+-doped phosphor having a composition selected from the group consisting of U.sup.6+-doped phosphate-vanadate phosphors, U.sup.6+-doped halide phosphors, U.sup.6+-doped oxyhalide phosphors, U.sup.6+-doped silicate-germanate phosphors, U.sup.6+-doped alkali earth oxide phosphors, and combinations thereof, is presented. The U.sup.6+-doped phosphate-vanadate phosphors are selected from the group consisting of compositions of formulas (A1)-(A12). The U.sup.6+-doped halide phosphors are selected from the group consisting of compositions for formulas (B1)-(B3). The U.sup.6+-doped oxyhalide phosphors are selected from the group consisting of compositions of formulas (C1)-(C5). The U.sup.6+-doped silicate-germanate phosphors are selected from the group consisting of compositions of formulas (D1)-(D11). The U.sup.6+-doped alkali earth oxide phosphors are selected from the group consisting of formulas (E1)-(E11).

This disclosure relates to inorganic structured metal luminophores for the detection of peroxides and/or free radicals in proximity thereto. The disclosure includes the application of inorganic phosphates or mixtures thereof with one or more metal components that provides a structured metal luminophore capable of providing real-time detection and/or measurement of the presence of peroxides and/or free radicals in an environment proximal to the structured metal luminophore.