83results about How to "Improve color temperature" patented technology

The present invention relates to a double-layer YAG:Ce/(Gd,Y)AG:Ce composite transparent ceramic phosphor for white light LED packaging, and a preparation method thereof. The composite transparent ceramic phosphor comprises two laminated transparent ceramic layers, wherein the chemical composition of the first transparent ceramic layer is (CexY1-x)3Al5O12, x is more than or equal to 0.0005 and is less than or equal to 0.05, the chemical composition of the second transparent ceramic layer is (CeyGdzY1-y-z)3Al5O12, y is more than or equal to 0.0005 and is less than or equal to 0.05, and z is more than or equal to 0.25 and is less than or equal to 0.75. According to the present invention, under the excitation of the blue light emitted by the LED chip and having the wavelength of about 465 nm, the cerium-yttrium-aluminum-doped garnet (YAG:Ce) transparent ceramic can emit the wide spectrum yellow light with the peak value of 530 nm, and the cerium-gadolinium-yttrium-aluminum-doped garnet ((Gd,Y)AG:Ce) transparent ceramic can emit the red yellow light with the wavelength of close to 580 nm, such that the white light spectrum with the sufficient red light component can be obtained through the compounding so as to effectively improve the LED luminescence color temperature while obtain the high luminous efficiency.

A voltage monitor and LED color controller circuit detects wall light dimmer and wall light switch on/off status based upon the output of an LED driver located downstream from the wall light dimmer and switch. Various switch time delays will produce several different outputs from an LED array, enabling wall dimmer switch control of intensity and Correlated Color Temperature (CCT). In addition, a preferred embodiment will first turn on in a default mode with a spectrum that is substantially devoid of violet wavelengths and provides only nominal amounts of blue light, to avoid undesirable disruption of circadian rhythm. In other embodiments, various controls may be provided that permit custom light therapy for various purpose and benefit.

The invention discloses near-ultraviolet-excited white-light LED (light-emitting diode) fluorescent powder and a preparation method thereof, and relates to the field of rear-earth-doped light-emitting materials and solid illumination. The fluorescent powder material takes molybdate/tungstate as a substrate, and has a chemical formula of AR2(WO4)4-x(MoO4)x:Eu<2+>, Mn<2+>, wherein A is one or a combination of more of Mg, Ca, Sr, Ba, Cu and Zn; R is one or a combination of more of Al, Sc, La, Gd, Y, Bi and the like; x ranges from 0 to 4. The fluorescent powder disclosed by the invention is stable in physical and chemical properties while being excited by near ultraviolet, and excellent in luminescence property at a high temperature, and the substrate of the material can absorb near-ultraviolet photons which are transmitted to Eu<2+> and Mn<2+> ions through energy, so that fluorescent emission excitement of the Eu<2+> and Mn<2+> ions within a range of 420 nm to 650 nm can be realized. The fluorescent powder material has the advantages of high absorption efficiency, stable performance, high light-emitting efficiency, adjustable color and the like in a near-ultraviolet region, and the preparation process is simple.

The invention discloses a preparation method of Eu<3+> doped molybdate red fluorescent powder used for a white light LED (Light Emitting Diode). A chemical formula of the red fluorescent powder is Sr2CaMoO6:xEu<3+>, wherein x is greater than or equal to 0.01 and less than or equal to 0.15. Raw materials are weighed according to a stoichiometric ratio, the raw materials and a fluxing agent are fully and evenly mixed, and a mixture is added into double crucibles made of corundum, wave absorbent is arranged between the double crucibles, the double crucibles are loaded into a microvan, temperature is quickly raised to 750 to 950DEG C, the mixture is sintered in an oxidation environment, and heat preservation time is 0.5 to 4h; finally, cooling, grinding, washing and drying are carried out to obtain the red fluorescent powder used for the white light LED. During microvan sintering, the fluxing agent is added to accelerate the formation and growth of molybdate polycrystal, the sintering degree of the fluorescent powder is obviously lowered, sintering time is obviously shortened, a powder body is loose and does not need to be mechanically smashed, in addition, the shapes of aluminate fluorescent powder particles are effectively controlled, and the particles with a small particle diameter and even distribution are obtained, wherein the appearance of the particles is similar to a sphere.

A day/night switchable light adjusting device and light adjusting method thereof are provided. The day/night switchable light adjusting device is composed of a plurality of panels; each panel includes a reflecting surface and at least one lighting unit. Each lighting unit can emit various wavelength region lights, and the various wavelength lights are mixed on a light collecting component. A control unit is provided for adjusting the various wavelength region lights corresponding to day/night variation. A light intensity of a cyan region light or a blue region light is reduced for preventing an over-inhibition on a quantity of Melatonin.

A YAG transparent ceramic for white light LED lamps. Sintering raw materials comprise, by weight, 220-300 parts of Al2O3, 300-380 parts of Y2O3, 60-75 parts of SiO2, 15-20 parts of CeO2, 5-10 parts of Pr2O3, 2-5 parts of Eu2O3, 2-4 parts of Lu2O3, 1-2 parts of LiF, 3-5 parts of B2O3, 3-5 parts of SiC, and 0.5-1 part of CaO. The purity of all the raw materials is above 99.99 wt%. The transparent ceramic has a light transmittance in the visible light region of up to 65%-75%, and has a color temperature of 4000-5000 k. Compared with the prior art, the transparent ceramic is improved in aspects of shrinkage percentage, light transmittance, color rendering index, and color temperature, and has the characteristics of high thermal conductivity, good chemical stability, long service life, and high luminous efficiency.

A plasma display panel for improving a color coordinates correction and a color temperature is disclosed. In the plasma display panel, a vertical barrier rib separates red, green and blue discharge cells from each other in a longitudinal direction. A horizontal barrier rib is provided between the vertical barrier ribs to separate the red, green and blue discharge cells from each other in a wide direction. The horizontal barrier rib has a first horizontal barrier rib provided between the red discharge cells, a second horizontal barrier rib provided between the green discharge cells, and a third horizontal barrier rib provided between the blue discharge cells and having a smaller width than the first and second horizontal barrier ribs.

The invention discloses an HID (high intensity discharge) high-efficiency street lamp reflecting mirror, which comprises a shell, wherein the shell is further internally provided with a reflecting mirror, and the shell and the reflecting mirror are in parabola curve shape. The included angel between the axis of the shell and the axis of the reflecting mirror is 2-10 degrees, a shell fixing bulge is arranged on one end of the shell, a shell fixing wing is arranged on the other end of the shell, the inner wall of the reflecting mirror is further provided with a plurality of reflecting units which are in parabola curve shape, the plurality of reflecting units are connected with each other to be in a wave shape, the reflecting units are used for ensuring that the inner wall of the reflecting mirror is in a multiple free-form surface shape, the focal position of the reflecting mirror is further provided with a reflecting board, a plurality of cambered surfaces are arranged on the reflecting board, and a lamp-socket is arranged in the middle of the reflecting board. The invention has the advantages of simple structure and convenient use, and can ensure that the HID lighting effect is fully utilized and the road is brighter, safer and more uniform and has no dead zone of illumination.

The invention discloses white-light fluorescent powder taking borate as a single substrate and a preparation method for the white-light fluorescent powder. A general chemical formula of the white-light fluorescent powder is as follows: Na3Gd2-x(BO3)3:x:Dy<3+>, wherein x is greater than or equal to 0.01 but smaller than or equal to 0.15. Fluorescent powder is prepared by adopting a solid phase method, the process is simple, the calcination temperature is low, the preparation period is short and pollution on environment is avoided. The fluorescent powder is stable in performance, and white light emitted under near-ultraviolet excitation is high, and is close to ideal white light. And therefore, the white-light fluorescent powder has good application potential on LED (light-emitting diode) illumination development and industrial production.

This invention provides a road fluorescent lamp. A problem existing in traditional high-pressure sodium lamp is that the maximum light energy output concentrates at 580 nm which has low effective light flux and low exciting value to man's eye at neso-vision belonging to yellow light zone. This invented lamp includes a lamp characterizing in that the wavelength main peek value of fluorescence powder coated on the lamp is 516+/-10nm and sub-peak values are 480+/-10nm, 450+/-10nm and 611+/-10nm, the distribution of which comforms to the meso-vision spectrum sensitivity between bright and dark visions of man's eye.

The invention discloses a praseodymium doped borate red luminescent material and a preparation method and applications thereof. The chemical formula of the luminescent material is ARB7O13:Pr3+; wherein A represents one or more of Mg, Ca, Sr, Ba, Cu, and Zn, and R represents one or more of Al, Sc, La, Gd, Y, and Bi. The properties and luminescent performance of the luminescent material are stable at a high temperature. The invention also discloses a preparation method of the praseodymium doped borate red luminescent material, the preparation technology is simple and is suitable for large scale industrial production, and the cost is low. The luminescent material can be applied to the fields such as white light LED illumination, display technology, and the like.

The embodiment of the invention provides an LED (Light Emitting Diode) lamp which comprises a lamp shade, a plurality of LED light sources, a first reflecting plate and a second reflecting plate, wherein the lamp shade is used for carrying out scatter diffuse on LED light radiating to the inside of the lamp shade; the LED light sources are configured into the lamp shade and are used for providing the LED light to the inside of the lamp shade; the first reflecting plate is provided with an opening, is positioned above the LED light sources and is used for reflecting part of LED light to the outlet direction of the lamp shade; and the second reflecting plate is positioned above the opening of the first reflecting plate, shields part of opening of the first reflecting plate and is used for reflecting part of the LED light entering through the opening of the first reflecting plate to the side direction of the lamp shade. According to the embodiment of the invention, the light distribution angle can be increased and the color temperature is improved.