White light light-emitting diode (LED) high in temperature resistance and free of fluorescent powder

Abstract

The invention relates to a white light light-emitting diode (LED) free of fluorescent powder, in particular to a white light LED high in temperature resistance and free of fluorescent powder, and provides the white light LED high in temperature resistance and free of fluorescent powder. The white light LED high in temperature resistance and free of fluorescent powder comprises a blue light chip fixed on a chip board and glass gens adding rare earth ion. Light emitted by the scare earth ion under illumination of blue light radiated by the blue light chip can mix with the blue light to from a white light. The white light LED high in temperature resistance and free of fluorescent powder has the advantages that temperature resistance is high, color development is even, packaging lighting effect is good, and product quality is high.

Description

technical field [0001] The invention relates to a white light LED without phosphor powder, in particular to a high temperature resistant white light LED without phosphor powder. Background technique [0002] There are three main lighting methods of the existing LED white light technology: one 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; The blue LED chip is coated with green and red phosphors, and the blue light emitted by the chip is combined with the green light and red light emitted by the phosphor to obtain white light; the third is to coat three primary colors or multiple colors on the purple or ultraviolet LED chip The fluorescent powder is used to excite the fluorescent powder by long-wave ultraviolet light (370nm-380nm) or purple light (380nm-410nm) emitted by the chip to achieve white light emis...

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Problems solved by technology

There is a key problem in the above three methods, that is, phosphor powder is required, and the traditional phosphor coating process is not only complicated but also cannot ensure the uniform distribution of phosphor powder, so the light color is prone to yellow circle phenomenon; in addition, LED is a Semiconductor products are most afraid of high temperature, and the high temperature resistance of inorganic materials such as phosphor powder is not high at about 180 degrees, and in high temperature environments, problems such as phase change, color drift, curing and cracking will occur. The patent publication number is The Chinese patent of CN101877374 (2010-11-03) provides a process for preparing white light LEDs using phosphor lenses. Although this process does not use phosphors, a large amount of silica gel is added in the process of making phosphor lenses, which is easy to cause Part of the blue light emitted by the LED chip is scattered back to the LED chip by the particles, and then absorbed by the chip, resulting in energy loss and low light efficiency of the package; moreover, the packaged silicone lens can withstand a maximum temperature of 160 degrees, and if the long-term high temperature will cause cracking, so how to make it LED has high temperature resistance and good luminous characteristics, so phosphor and silica gel process must be abandoned

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