Method for producing high-luminance monochromatic light based on optical wavelength conversion and light source

1. A method for generating a high brightness monochromatic light based on wavelength conversion, comprising:

A. providing a first wavelength conversion material and a second wavelength conversion material;

B. using an excitation light to excite the first wavelength conversion material and the second wavelength conversion material, wherein the first wavelength conversion material absorbs the exciting light and emits a first converted light, the second wavelength conversion material absorbs a first spectral part of the first converted light and emits a second converted light, wherein a light power of the first spectral part absorbed by the second wavelength conversion material is equal to or greater than 50% of a total light power of the first converted light;

C. mixing the second converted light and a remaining part of the first converted light which is not absorbed by the second wavelength conversion material to form the high brightness monochromatic light.

2. The method of claim 1 , wherein the second wavelength conversion material further absorbs the excitation light to emits the second converted light.

3. The method of claim 1 , wherein the step A further includes a step of providing a dichroic element in an output light path of the high brightness monochromatic light, wherein the dichroic element has dichroic characteristics which separate the high brightness monochromatic light from the excitation light which is not absorbed by the first wavelength conversion material and the second wavelength conversion material, wherein in step C the high brightness monochromatic light is selectively output.

4. The method of claim 3 , wherein the dichroic element further has dichroic characteristics which separate the first spectral part and the second spectral part of the first converted light, wherein in step B the dichroic element reflects the light of the first spectral part back to the second wavelength conversion material and transmits the light of the second spectral part and the second converted light, and wherein in step C the high brightness monochromatic light which consists of the second converted light and the second spectral part of the first converted light is selectively output.

5. The method of claim 1 , wherein step A further includes a step of providing a dichroic element in an output light path of the high brightness monochromatic light, wherein the dichroic element has dichroic characteristics which separate the first spectral part and the second spectral part of the first converted light, wherein in step B the dichroic element reflects the light of the first spectral part back to the second wavelength conversion material and transmits the light of the second spectral part and the second converted light.

6. The method of claim 1 , further comprising:

D. using a color modification filter to modify a spectrum of the high brightness monochromatic light so that color coordinates of the high brightness monochromatic light achieve predetermined values.

7. The method of claim 1 , wherein a light power of the second converted light is greater than 40% and less than 80% of a light power of the high brightness monochromatic light.

8. The method of claim 1 , wherein the first wavelength conversion material and the second wavelength conversion material are spatially separated apart, or the first wavelength conversion material and the second wavelength conversion material form respective layers arranged in a stack, or the first wavelength conversion material and the second wavelength conversion material are mixed to form a single layer.

9. The method of claim 8 , wherein when the first wavelength conversion material and second wavelength conversion material are spatially separated apart, a fourth dichroic element is provided between the first wavelength conversion material and the second wavelength material, wherein the fourth dichroic element transmits the first converted light and reflects or partially reflects the second converted light.

10. The method of claim 1 , wherein in step A the first wavelength conversion material and the second wavelength conversion material are disposed onto a reflective plate, and a third dichroic element is provided at an angle on another side of the first wavelength conversion material and the second wavelength conversion material;

wherein the third dichroic element has dichroic characteristics that reflect the excitation light and transmit the second converted light and the second spectral part of the first converted light, wherein in step B the third dichroic element guides the excitation light to the first wavelength conversion material and the second wavelength conversion material, and wherein in step C the third dichroic element provides the high brightness monochromatic light by transmission;

or, the third dichroic element has dichroic characteristics that transmit the excitation light and reflect the second converted light and the second spectral part of the first converted light, wherein in step B the third dichroic element guides the excitation light to the first wavelength conversion material and the second wavelength conversion material, and wherein in step C the third dichroic element provides the high brightness monochromatic light by reflection.

11. The method of claim 10 , wherein when the first wavelength conversion material and the second wavelength conversion material form respective layers arranged in a stack on the reflective plate, the first wavelength conversion material layer is located closer to the reflective plate than the second wavelength conversion material layer.

12. The method of claim 1 , wherein the first wavelength conversion material and the second wavelength conversion material are disposed on a moving device and driven to move relative to the excitation light.

13. The method of claim 12 , wherein the moving device includes a rotating disc or wheel.

14. The method of claim 1 , wherein step A further includes a step of providing a second dichroic element on one side of the first wavelength conversion material and the second wavelength conversion material facing the excitation light, wherein the second dichroic element has dichroic characteristics that transmit the excitation light and reflect the first converted light.

15. The method of claim 14 , further comprising providing an air gap between the first wavelength conversion material or the second wavelength conversion material and the second dichroic element.

16. The method of claim 3 , further comprising providing an air gap between the first wavelength conversion material or the second wavelength conversion material and the dichroic element.

17. A light source device, comprising an excitation light source, and a first wavelength conversion material and a second wavelength conversion material that are excited by an excitation light emitted from the excitation light source, wherein the light source devices generates a high brightness monochromatic light using the method of claim 1 .

18. The method of claim 3 , wherein step A further includes a step of providing a second dichroic element on one side of the first wavelength conversion material and the second wavelength conversion material facing the excitation light, wherein the second dichroic element has dichroic characteristics that transmit the excitation light and reflect the first converted light.

19. The method of claim 5 , wherein step A further includes a step of providing a second dichroic element on one side of the first wavelength conversion material and the second wavelength conversion material facing the excitation light, wherein the second dichroic element has dichroic characteristics that transmit the excitation light and reflect the first converted light.

20. The method of claim 5 , further comprising providing an air gap between the first wavelength conversion material or the second wavelength conversion material and the dichroic element.