Single-chip LED with three luminescent spectrums of red, blue and green wavelengths
The present invention relates to a single-chip light-emitting diode (LED) with three luminescent spectrums of red, blue and green wavelengths. The single-chip light-emitting diode of the invention comprises a base, two conductive pins, a single-chip light-emitting element, a package material, and red fluorescent powder. The single-chip light-emitting element is disposed on the base and electrically connected to the two conductive pins. The red fluorescent powder is added to the package material. The single-chip light-emitting element comprises a substrate, an N-type cladding layer, a P-type cladding layer, at least one green light-emitting layer, and at least one blue light-emitting layer. The green light-emitting and blue light-emitting layers are formed between the N-type cladding layer and the P-type cladding layer. According to the single-chip LED of the present invention, the green and blue light spectrums are direct light sources respectively supplied for the blue light-emitting layer and the green light-emitting layer of the single-chip light-emitting element. The red light spectrum is a red light generated by exciting the red fluorescent powder with the blue or green light or their combination of the single-chip light-emitting element. Therefore, the single-chip LED with the three luminescent spectrums of red, blue and green wavelengths may be applied to the backlight source of the liquid crystal display module to provide the properties of high color-rendering, preferred power-saving and small volume.
1. A single-chip light-emitting diode (LED) with three luminescent spectrums of red, blue and green wavelengths, comprising:
a base;
two conductive pins;
a single-chip light-emitting element, disposed on the base and electrically connected to the two conductive pins;
a package material, for packaging the single-chip light-emitting element; and
red fluorescent powder, added to the package material, with an emission wavelength ranging from 585 nm to 710 nm;
wherein the single-chip light-emitting element comprising:
a substrate,
a N-type cladding layer;
a P-type cladding layer;
at least one green light-emitting layer, formed between the N-type cladding layer and the P-type cladding layer, with an emission wavelength ranging from 510 nm to 585 nm; and
at least one blue light-emitting layer, formed between the N-type cladding layer and the P-type cladding layer, with an emission wavelength ranging from 400 nm to 495 nm.
2. The single-chip LED according to claim 1 , wherein the blue light-emitting layer is formed below the P-type cladding layer, while the green light-emitting layer is formed above the N-type cladding layer.
3. The single-chip LED according to claim 2 , wherein the blue light-emitting layer is a blue quantum-dot light-emitting layer, and the green light-emitting layer is a green quantum-dot light-emitting layer.
4. The single-chip LED according to claim 2 , wherein the blue light-emitting layer is a blue quantum-dot light-emitting layer, and the green light-emitting layer is a green quantum-well light-emitting layer.
5. The single-chip LED according to claim 1 , wherein the green light-emitting layer is formed below the P-type cladding layer, and the blue light-emitting layer is formed above the N-type cladding layer.
6. The single-chip LED according to claim 5 , wherein the blue light-emitting layer is a blue quantum-dot light-emitting layer, and the green light-emitting layer is a green quantum-dot light-emitting layer.
7. The single-chip LED according to claim 5 , wherein the blue light-emitting layer is a blue quantum-well light-emitting layer, and the green light-emitting layer is a green quantum-dot light-emitting layer.
8. The single-chip LED according to claim 1 , wherein a first green light-emitting layer is formed below the P-type cladding layer, a second green light-emitting layer is formed above the N-type cladding layer, and the blue light-emitting layer is formed between the first green light-emitting layer and the second green light-emitting layer.
9. The single-chip LED according to claim 1 , wherein a first blue light-emitting layer is formed below the P-type cladding layer, a second blue light-emitting layer is formed above the N-type cladding layer, and the green light-emitting layer is formed between the first green light-emitting layer and the second green light-emitting layer.
10. The single-chip LED according to claim 1 , wherein the single-chip light-emitting element further comprises at least one UV light-emitting layer, which is formed between the N-type cladding layer and the P-type cladding layer.
11. The single-chip LED according to claim 10 , wherein the UV light-emitting layer is formed below the P-type cladding layer, and the UV light-emitting layer is a quantum-dot light-emitting layer.
12. The single-chip LED according to claim 1 , wherein the single-chip light-emitting element further comprises two electrodes, which are electrically connected to the two conductive pins, respectively.
13. The single-chip LED according to claim 1 , wherein the red light of the red fluorescent powder is generated by the excitation of the blue light from the blue light-emitting layer, with the wavelength of the blue light from the blue light-emitting layer ranging from 400 nm to 495 nm.
14. The single-chip LED according to claim 1 , wherein the red light of the red fluorescent powder is generated by the excitation of the green light from the green light-emitting layer, with the wavelength of the green light from the green light-emitting layer ranging from 510 nm to 585 nm.
15. The single-chip LED according to claim 1 , wherein the red light of the red fluorescent powder is generated by the excitation of the blue light from the blue light-emitting layer and the green light from the green light-emitting layer, with the wavelength of the blue light from the blue light-emitting layer ranging from 400 nm to 495 mm, and the wavelength of the green light from the green-light-emitting layer ranging from 510 nm to 585 nm.
16. The single-chip LED according to claim 10 , wherein the red light of the red fluorescent powder is generated by the excitation of the blue light from the blue light-emitting layer, the green light from the green light-emitting layer and the UV light from the UV light-emitting layer, with the wavelength of the UV light from the UV light-emitting layer ranging from 250 nm to 400 nm, the wavelength of the blue light from the blue light-emitting layer ranging from 400 nm to 495 nm, and the wavelength of the green light from the green light-emitting layer ranging from 510 nm to 585 nm.
17. A display, comprising:
a backlight source, having a plurality of the single-chip LEDs with the three luminescent spectrums of red, blue and green wavelengths according to claim 1 ;
a liquid crystal unit module; and
a color filter.