White light illuminating device

Abstract

The device contains optical semiconductor as light source of blue light. Fluorescent layer is glued on the optical semiconductor. The fluorescent layer is prepared by even mixing red and green luminescent powders and transparent glue. Red fluorescence in fluorescent layer is emitted light different from blue spectrum (wavelength) excited by blue light, and green fluorescence in fluorescent layer is emitted light different from blue spectrum excited by blue light. Mixing the said two different spectrums (wavelengths) and unexcited blue spectrum form white light. Fluorescent layer mixed from red or jacinth and green is able to influence wavelength of blue light source, emitting light different from blue light so as to obtain white light illuminator generating pure white light with higher intensity.

Description

Technical field [0001] The invention relates to a white light emitting device, in particular to a pure white light emitting diode (LED) device. Background technique [0002] According to the well-known white light LED, its typical example, such as Taiwan Patent Publication No. 385063 (new white light LED) invention case, it uses ultraviolet light semiconductor as light source to excite red, green, blue (R, G, B ) The cladding layer mixed with three-color fluorescent powder and transparent glue makes white light appear. [0003] However, the light source of this light-emitting device is ultraviolet light, which will damage the epoxy resin structure commonly used at present, resulting in the problem of light attenuation in the final (white light), and the brightness of white light is not strong, especially in this case. The cladding layer is made of red, green, and blue fluorescent powders mixed together. One of the disadvantages is that the ratio of the three pigments and th...

AI Technical Summary

Problems solved by technology

[0005] However, the pomegranate-based phosphor activated by cerium is essentially a yellow phosphor, in which a gadolinium nitride-based semiconductor light-emitting element that can emit short-wavelength blue light is used as the light source, and the light source emits blue light to excite yellow fluorescent light. The layer is used to produce white light of different wavelengths. Since only the light of a single wavelength is mixed with part of the unexcited blue light, its color rendering is poor, that is, the white light is distorted and impure. The main problem is that the phosphor lacks red. Spectrum

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