Led lamp having two layers of fluorescent powder
OwnerYung Pun Chenginventor
Life of this patent
Estimating the term…
Abstract
An LED lamp has two layers of fluorescent powder, wherein a blue light of 400-530 nm emitted by a blue light LED chip first irradiates on an inner layer of silicate fluorescent powder to excite a light of a higher wavelength which is then emitted to an outer layer of YAG fluorescent powder, so as to obtain an ideal warm white light. The yellow light excited by the silicate fluorescent powder re-excites YAG fluorescent powder to obtain a warm white light having a higher color rendering index, while a light source with an area several times greater than that of the original chip obtained by exciting the inner layer of silicate fluorescent powder can re-excite the YAG fluorescent powder to multiply the excitation effect.
Claims20
An LED lamp having two layers of fluorescent powder, comprising:
- one or more blue light LED chips;
- an inner cover which contains silicate fluorescent powder and covers the one or more blue light LED chips;
- and
- an outer cover which contains YAG fluorescent powder or silicate fluorescent power and covers outside of the inner cover.
An LED lamp having two layers of fluorescent powder, comprising:
- one or more blue light LED chips;
- an inner cover which contains silicate fluorescent powder and covers the one or more blue light LED chips;
- and
- an outer cover which contains YAG fluorescent powder or silicate fluorescent power and covers outside of the inner layer;
- wherein the outer and inner covers are independent covers with a distance therebetween.
An LED lamp having two layers of fluorescent powder, comprising:
- one or more blue light LED chips;
- a transparent casing;
- an inner cover coated on an inner surface of the transparent casing, the inner cover containing silicate fluorescent powder and covering the one or more blue light LED chips;
- and
- an outer cover coated on an outer surface of the transparent casing, the outer cover containing YAG fluorescent powder or silicate fluorescent power and covering outside of the inner cover.
Dependencies are inferred from the claim text.