Abstract:
The present disclosure provides methods for generating tunable white light with controllable circadian energy performance. The methods use a plurality of LED strings to generate light with color points that fall within blue, yellow/green, red, and cyan color ranges, with each LED string being driven with a separately controllable drive current in order to tune the generated light output. Different light emitting modes can be selected that utilize different combinations of the plurality of LED strings in order to tune the generated white light. One or more of the LED strings can have ultraviolet or violet LEDs.
Abstract:
Systems and methods to provide multiple channels of light to form a blended white light output, the systems and methods utilizing recipient luminophoric mediums to alter light provided by light emitting diodes. The predetermined blends of luminescent materials within the luminophoric mediums provide predetermined spectral power distributions in the white light output.
Abstract:
A phosphor composition is presented. The phosphor composition includes a first phosphor that includes a phase of general formula (I): L 3 ZO 4 (Br 2-n X n ): Eu 2+ (I) wherein 0 ≤ n ≤ 1; L is Zn, Mg, Ca, Sr, Ba, or combinations thereof; Z is Si, Ge, or a combination thereof; and X is F, Cl, I, or combinations thereof. A lighting apparatus that includes a light source and the phosphor composition radiationally coupled to the light source is also presented.
Abstract:
The invention relates to a method for producing fluorescent particles of an Si-containing and/or Al-containing fluorescent material with a protective layer, having the following method steps: A) treating the Si-containing and/or Al-containing fluorescent material with an acid solution, wherein the pH value of the acid solution is kept within a range of pH 3.5 to 7 for a period of time of at least 1 h, and an Si-containing layer is formed on the fluorescent particles, said Si-containing layer having a higher content of Si on the surface than the fluorescent particles, and/or an Al-containing layer is formed on the fluorescent particles, said Al-containing layer having a lower content of Al on the surface than the fluorescent particles, and B) tempering the treated fluorescent particles at a temperature of at least 100 °C, thereby producing the protective layer. By using such a method, stable protective layers can be produced on fluorescent particles in a particularly simple manner.
Abstract:
Described herein is a method for making a phosphor ceramic element. Also described herein are ceramic elements including a phosphor having the following formula: (Eu x Ca 1-x ) m/2 Si 12-(m+n) AL m+n O n N 16-n , Formula 1, wherein 0.001≤x≤0.25, 0.001≤m≤7, and 0.001≤n≤5.
Abstract:
本发明涉及一种荧光材料及其制备方法,所述荧光材料包括具有通式I的化合物:[Lu 1-a-c-d-2/3b Y a Σ(Ln-1) c ∑(Ln-2) d M b ] 3±δ [Al 1-x Ga x ] 5 (O 1-1/2y X y ) 12±1.5δ 。本发明还涉及包含所述荧光材料的荧光材料组合物。本发明的荧光材料及包含所述荧光材料的组合物具有高亮度、高显色性、稳定性强、抗光衰等优点。