LED package structure
An LED package structure includes a transparent substrate having a supporting face and a light-emergent face opposite to the supporting face, a housing disposed on the supporting face, two electrodes disposed on the housing, an LED chip disposed on the supporting face and electrically connected to the two electrodes, a reflecting layer covering the LED chip to reflect light emitted by the LED chip toward the transparent substrate, and a phosphor layer formed on the light-emergent face of the substrate. The phosphor layer includes a plurality of layers each having a specific light wavelength conversion range to generate a light with a predetermined color.
1. A light emitting diode (LED) package structure, comprising:
a transparent substrate having a supporting face and a light-emergent face opposite to the supporting face;
a housing disposed on the supporting face;
two electrodes disposed on the housing;
an LED chip disposed on the supporting face and electrically connected to the two electrodes;
a reflecting layer covering the LED chip to reflect light emitted by the LED chip toward the transparent substrate; and
a phosphor layer formed on the light-emergent face of the substrate, wherein the phosphor layer comprises a plurality of layers each having a specific light wavelength conversion range to emit a light with a predetermined color.
2. The LED package structure as described in claim 1 , wherein the substrate is made of material selected from one of silicon dioxide, silicon nitride, diamond, diamond-like material, sapphire, polymer material and quartz.
3. The LED package structure as described in claim 1 , wherein the substrate is a flat layer.
4. The LED package structure as described in claim 1 , wherein a receiving portion is defined at a center of the housing for receiving the LED chip therein.
5. The LED package structure as described in claim 4 , wherein the receiving portion extends through the housing, whereby a part of the supporting face is exposed via the receiving portion.
6. The LED package structure as described in claim 1 , wherein the receiving portion has a periphery surrounding the LED chip.
7. The LED package structure as described in claim 6 , wherein each of the two electrodes extends from a top face of the housing along the periphery of the receiving portion to the supporting face of the substrate.
8. The LED package structure as described in claim 1 , wherein the housing is made of material selected from one of aluminum nitride, silicon, boron nitride and graphite.
9. The LED package structure as described in claim 1 , wherein the electrodes are made from materials selected from aluminum, gold, copper, nickel, and indium tin dioxide.
10. The LED package structure as described in claim 1 , wherein the phosphor layer has a structure of a film and is formed on the light-emergent face of the substrate by one of attachment and coating.
11. The LED package structure as described in claim 1 , wherein values of the wavelength of the lights emitted by the layers gradually decrease along a direction away from the substrate.
12. The LED package structure as described in claim 11 , wherein the phosphor layer comprises a first layer formed on the light-emergent face, a second layer formed on the first layer, and a third layer formed on the second layer.
13. The LED package structure as described in claim 12 , wherein the first layer comprises a first phosphorous compound whereby the first layer emits red light, the second layer comprises a second phosphorous compound whereby the second layer emits green light, and the third layer comprises a third phosphorous compound whereby the third layer emits blue light.
14. The LED package structure as described in claim 1 , wherein a height of the housing is equal to that of the LED chip.