Method for generating white light by violet LED
Technical Field The invention relates to a utilizing a purple light LED (light emitting diode) method for generating white light, in particular to a purple and white light fluorescent powder with LED chip and method for generating high color rendering white light. Background Art 1996 years japan Japan Asia kagaku the development of blue light emitting diodes, to its excitation phosphor to produce yellow light, the mixed light color, thus generating high-luminance white light, can substitute the incandescent lamp in the future as a white light source, the white light LED is applied to the lighting opening times. Using the blue light of the blue light LED in order to produce a fluorescent material is irradiated with the blue light, the yellow light are complementary, the principle of re-utilize the lens the yellow light, the blue light to be mixed, produce white light vision of the human eye. However this way the white light because of poor color rendering, the pall will be uncomfortable to the naked eye. The mixed color of white light, can be human eyes to feel white light includes at least more than two kinds of wavelength mixed light. red human eye at the same time, for example, blue, green light when stimulated, or at the same time blue light and yellow light when stimulated by, or at the same time when stimulated by the violet and yellowish white light , can be experienced in order to white light, in accordance with this principle can be designed to produce various white light LED light source. Three-wave of the prior art during the manufacture of long white light source in order to improve color it develops , all use of three or more than phosphor powder. At the same time, however, by using multiple phosphor to make a fluorescent, must be a prerequisite for the selected one of the excitation light can be absorbed by the phosphor, and the phosphor powder on the selected excitation wavelength absorption coefficient of light can not be too many, but also light energy conversion should also be as close as possible to the quantum efficiency for the best, this may facilitate deployment of three primary colors the proportion of the phosphor powder in order to obtain the best white light, but the phosphor powder material and the difficulties of uniform mixing. To date, experimental data can be known by the phosphor powder excited by the purple light to emit visible light of energy conversion efficiency is usually to the infrared light or high excited fluorescence powder blue light institute. Therefore, after the GaN series blue light LED, a violet LED is the goal of the next development. In the United States currently has SemiLEDS 2007 years 2 month the success of each tile 110 lumens using the blue LED chip excites the ultra-high brightness white LED, its light-emitting efficiency has been surpassed all other forms of light source, and the LED chip to make the efficiency to purple light and a blue light LED chip has been also close to, a violet emitting white light of the LED in the future become very potential product. Content of the invention The purpose of this invention is to provide a white light of high color rendering can be formed of the method, the white light generated by the light source the energy conversion efficiency is high, the white light emitted strength is excellent, and the preparation of the phosphor powder of the procedure is simple, mass-spectrum of good accuracy and reproducibility, is suitable for mass production of high-quality white light source. In order to realize the above-mentioned purpose, the invention provides the following proposal: A method for generating white light violet LED, characterized in that the light-emitting wavelength 380-410nm a violet purple light generated by the LED chip directly stimulate a phosphor powder; wherein the method for the preparation of the phosphor powder of: the purity is 99.99% for curing zinc powder and purity of more than 99.99% of zinc selenide more than in the 8 [...] 2 in the weight ratio of water to the mix and dry settling manner, then the use of a solid state reaction method of the air with oxygen is introduced in the high temperature furnace, the temperature setting for the 1000-1100 [...] , platinum-on-a-chip is placed in the powder after firing, in the rapid cooling and the normal temperature water is made in; the phosphor after stimulation by continuous wavelength 470 nm -670 nm yellowish white light of, and purple purple light of the LED to produce white light of high color rendering. The beneficial effects of this invention are: Purple light to excite and generate the present invention method for producing white light source, the characteristics of the following: (1) this invention is a kind of high color rendering method of generating a white light source, because the use of white light fluorescent powder, its light-emitting spectrum is continuous wavelength 470-670nm, purple light emitted by the chip with the purple light to form white light of high color rendering. This invention produce white light of high color rendering index of up to 82-87, far more than the commonly used blue light chip to white light generated by the phosphor powder color rendering index 70. (2) the light source of white light generated by the invention, because it is obtained by excitation visual purple institute , so the energy conversion efficiency is high, the white light emitted strength is excellent. (3) the present invention the white light source, only need to use a phosphor powder, and this the preparation of the phosphor powder of the procedure is simple, the spectral accuracy and with good reproducibility, the production method is suitable for mass production of high quality white light source. Brief description of the Figure Figure 1 the white light fluorescent powder of this invention by the violet light produced by the stimulating induced excitation spectrum. Figure 2 the white light fluorescent powder of this invention by the violet light produced by the stimulating induced radiation spectrum. Figure 3 is of the invention is to provide a white light emitting diode light source of the light-emitting spectrum. Mode of execution A high purity (99.99% or more) zinc sulfide (ZnS) powder and zinc selenide (ZnSe) powder, to the 8 [...] 2 in the weight ratio of water to the mix and dry settling manner, then utilize the solid-state reaction method for synthesizing white light fluorescent powder. Solid-state reaction method to inject, appropriate flow (5L/min) in the high temperature furnace of the air with oxygen, the temperature setting for the 1000-1100 [...] , platinum-on-a-chip is placed in the powder after firing, in rapid cooling in normal temperature water, then made into a may be subject to purple light excited and generate continuous wavelength 470-670nm radiation spectrum of the white light fluorescent powder. The phosphor powder after the component analysis, that is a kind of at least includes the zinc (Zn), sulfur (S), selenium (Se), oxygen (O) four elements zinc sulfide and zinc selenide of the synthetic material of oxide. Such white light fluorescent powder induced excitation spectrum as shown in Figure 1, its photo radiation spectrum as shown in Figure 2. Growth on the substrate the 380-410nm radiation wavelength violet light LED chip, is connected to the for the electric conduction plancyi. Then the above-mentioned synthetic white light fluorescent powder in a violet LED is on the surface of the chip, after encapsulation of the lens, is supplied with current, can obtain a high color rendering of the white light source. Making good white light light-emitting diode light source, the light-emitting spectrum as shown in Figure 3. The chromaticity coordinates X: 0.30-0.33, Y: 0.29-0.36 is located within the range of white light. The color rendering index 82-87 good. The scope of the present invention is not limited to the above-mentioned practical example, is limited to the case only Patent application range. The invention relates to a method for generating white light by utilizing a purple light LED (light emitting diode), in particular to a method matching yellow and white light fluorescent powder with a purple light LED chip to generate high color rendering white light. The invention aims to provide a method capable of forming the high color rendering white light, and the generated white light has the advantages of high light source energy conversion rate and good intensity of the emitted white light. The preparing flow of the fluorescent powder is simple and the mass produced spectrum accuracyand reproducibility are good, so the method is suitable for producing the high-quality white light sources in a large scale. The method utilizing the purple light LED to generate the white light is characterized in that the purple light generated by the purple light LED chip with the luminous wavelength of between 380 and 410 nanometers is utilized to directly stimulate the fluorescent powder, wherein the fluorescent powder is a material which at least contains four elements of zinc, sulfur, selenium and oxygen; and after being stimulated, the fluorescent powder emits the yellow and white light with a continuous wavelength of between 470 and 670 nanometers, and the yellow and white light and the purple light of the purple light LED generate the high color rendering white light. 1. A method for generating white light violet LED, characterized in that Using the light-emitting wavelength 380-410nm a violet purple light generated by the LED chip directly stimulate a phosphor powder; The method for the preparation of the phosphor powder of: the purity is 99.99% for curing zinc powder and purity of more than 99.99% of zinc selenide more than in the 8 [...] 2 in the weight ratio of water to the mix and dry settling manner, then the use of a solid state reaction method of the air with oxygen is introduced in the high temperature furnace, the temperature setting for the 1000-1100 [...] , platinum-on-a-chip is placed in the powder after firing, in the rapid cooling and the normal temperature water is made in; The phosphor after stimulation by continuous wavelength 470 nm -670 nm yellowish white light of, and purple purple light of the LED to produce white light of high color rendering. 2. Method according to Claim 1, characterized in that the ultraviolet LED chip to semiconductor material on the substrate to growth.