Light emitting device, lighting system, backlight unit for display device and display device

A method for producing an intended colored white light, the method comprising:

• a step for producing a first mixed light containing a first blue light and green light, by using a first blue light source which emits the first blue light and a first luminescent material which is exited by the first blue light emitted by the first blue light source and thereby emits the green light;
• a step for producing a second mixed light containing a second blue light and red light and being different in chromaticity from the first mixed light, by using a second blue light source which emits the second blue light and a second luminescent material which is exited by the second blue light emitted by the second blue light source and thereby emits the red light;
• a step for mixing the first mixed light and the second mixed light to produce a white light containing the first and second blue lights, green light and red light;
• and
• a step for adjusting a balance in intensity of the first and second blue lights, green light and red light contained in the white light.