Implementation method of white light LED capable of regulating color temperature, regulating color rendering index and regulating brightness

Abstract

The invention discloses an implementation method of a white light LED capable of regulating a color temperature, regulating a color rendering index and regulating brightness. The method 1 comprises the steps of: packaging and combining more than two LED chips coated with different color phosphors, each the phosphor with a single color excited by each LED chip in the combination generates a light color being the same as the color of the phosphor; and mixing the different-color light through circuit driven to generate full spectrum white light; or the method 2 comprises the steps of: packaging and combining a LED chip coated with a transparent adhesive tape with two or more than two LED chips coated with different color phosphors; and mixing the light with different colors in the combinationthrough circuit drive to generate the full spectrum white light. The method provided by the invention can perform light mixing through regulation of the current ratio of different light colors to achieve the random and adjustable white light color temperature, the color rendering index in the same color temperature scheme can be regulated, the brightness of different color temperatures can be randomly regulated. Compared to a traditional LED achieving white light, the white light mixed through circuit drive is easily implemented and more effective.

Description

technical field [0001] The invention belongs to the technical field of semiconductor lighting. More specifically, it relates to a method for realizing white LEDs with adjustable color temperature, adjustable display, and adjustable brightness. Background technique [0002] With the improvement of people's living standards, the requirements for LED lighting have gradually shifted from pure environmental protection and energy saving to the pursuit of health and comfort, that is, to meet the psychological and physical health needs of consumers as the goal, and focus on the "healthy lighting" brand. When it comes to the "health" index of LED lighting, it mainly refers to high color rendering, that is, the light source has a strong ability to restore the color of objects. However, since the luminous efficacy and the color rendering index of the light source have different requirements on the output light power distribution diagram, it is difficult to simultaneously improve the l...

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly three ways to realize white light: the first method is to coat the blue LED chip with yellow phosphor powder that can be excited by blue light, and the blue light emitted by the chip and the yellow light emitted by the phosphor complement each other to form white light; although Simple production, low cost, but low light efficiency, color rendering needs to be improved, and low color temperature is difficult to achieve

The second implementation method is to coat green and red phosphors on the blue LED chip, and combine the blue light emitted by the chip with the green light and red light emitted by the phosphor to obtain white light, which has better color rendering; however, although this scheme improves color rendering index, but there is a problem of reabsorption between different phosphors, which affects the lumen efficiency of white LEDs

The third realization method is to coat red, green, blue three-color or multi-color phosphor powder on the UV-LED chip, and use the long-wave ultraviolet (370nm-380nm) or purple light (380nm-410nm) emitted by the chip to excite the phosphor powder. Realize white light emission; this method has better color rendering, but the blue powder phosphor has the problem of low conversion efficiency; and at present, green phosphors with better excitation efficiency are mostly silicate systems, which are sensitive to temperature and humidity, Large light attenuation, only suitable for low-power packaging

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