White LED lamp secondary encapsulation structure capable of reducing blue-light hazards

Abstract

The invention discloses a white LED lamp secondary encapsulation structure capable of reducing blue-light hazards. The white LED lamp secondary encapsulation structure comprises a substrate, a blue LED chip and a YAG (yttrium aluminum garnet) yellow fluorescent powder layer. The blue LED chip is fixed onto the substrate, the YAG yellow fluorescent powder layer is overlaid on the blue LED chip, an outer fluorescent lampshade which covers the blue LED chip and the YAG yellow fluorescent powder layer is further fixed onto the substrate, and YAG yellow fluorescent powder is arranged on the outer fluorescent lampshade. The white LED lamp secondary encapsulation structure has the advantages that colors of white light emitted by an LED illuminating lamp are uniform, soft and harmonious by the aid of the white LED lamp secondary encapsulation structure; more importantly, influence of heat dissipated by the blue LED chip on the performance of the fluorescent powder can be effectively reduced, color temperature drift due to the heat of the chip is prevented, and the service life of the fluorescent powder is prolonged; blue-light radiation dosage is effectively reduced, blue-light radiation is scattered uniformly, and the potential hazards to people and organisms are reduced.

Description

technical field [0001] The invention belongs to the technical field of LED lighting lamps, and in particular relates to a secondary packaging structure of a white LED lamp that can reduce the harm of blue light. Background technique [0002] White Light-Emitting Diodes (WLEDs), known as the fourth-generation lighting source, is a new type of solid-state lighting device developed in the past ten years. Compared with existing light sources (incandescent lamps, fluorescent lamps, etc.) Advantages, such as energy saving, small size, long life, vibration resistance, fast response, no mercury and other toxic substances pollution, etc., the current application fields include indoor lighting, transportation trains, ships, aircraft and other box lighting , flashlight, LCD backlight (car, audio instrument, mobile phone backlight, etc.) and traffic lights, sign lights, information display screens, etc., the ultimate goal of its application is to replace traditional lighting sources. ...

AI Technical Summary

Problems solved by technology

However, this method is at the expense of sacrificing part of the light intensity, the light effect is relatively low, and the emission angle is also limited, and the blue ratio in white light will not decrease, so the uniformity and consistency are still relatively poor

[0006] 2. As the temperature generated by the working current continues to rise, the luminous efficiency of the phosphor will also drop sharply; at the same time, the emission peak is wide and short, the blue light excitation peak is high and narrow, the wavelength is short, and the energy is high, which can directly penetrate the crystal and reach On the fundus retina, activate cell oxidation reaction, initiate cell apoptosis, cause retinal cell damage, and lead to vision loss or even loss

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