Photoelectric semiconductor device capable of generating uniform compound lights
View Patent ↗A transparent layer and a phosphor layer are covered on the LED chip for increasing light emission efficiency and evenness of the LED. Based on angle-dependent emission strength of the LED chip, the phosphor layer is designed with different thickness or contains different phosphor powder concentration in different section. The lights emitted with different strength from different angle of the LED chip are transformed into uniform compound lights after passing through the phosphor layer that has different thickness or phosphor powder concentration. Micro structures capable of destroying the full reflection occurred on the incident lights are further configured on both the inner and outer surfaces of the phosphor layer to increase the light emission efficiency.
1. A photoelectric semiconductor device, comprising:
a light emitting diode (LED) chip being capable of generating a light output having a first light emitting strength (I 1 ) and a second light emitting strength (I 2 ) different from the first light emitting strength (I 1 );
a base, the LED chip fixed on the base;
a first layer covering the LED chip, wherein the first layer is transparent high polymer colloid; and
a second layer covering the first layer and containing at least one kind of phosphor powder, the second layer comprising at least a first section and a second section, wherein the first section has a first phosphor powder concentration (D 1 ) corresponding to the first light emitting strength (I 1 ), the second section has a second phosphor powder concentration (D 2 ) corresponding to the second light emitting strength (I 2 ), the first phosphor powder concentration is different from the second phosphor powder concentration, and I 1 /D 1 =I 2 /D 2 .
2. The photoelectric semiconductor device of claim 1 , wherein the second layer is a phosphor layer, the first section and the second section corresponding to different light emission angle of the LED chip.
3. The photoelectric semiconductor device of claim 1 , wherein the second layer is a lens.
4. The photoelectric semiconductor device of claim 1 , wherein the second layer further comprises a first surface and a second surface, the first surface contacting the surface of the first layer, the first surface and the second surface being convex.
5. The photoelectric semiconductor device of claim 4 , wherein the first surface and the second surface of the second layer both or respectively comprise radial-distributing micro structures formed with pyramid, Tetrahedron, cone, or circular waveform.