High brightness illumination device using double-sided excitation of wavelength conversion materials

An illumination device comprising:

• a wavelength conversion material;
• a first excitation light source structure generating a first excitation light incident on the wavelength conversion material from a first side;
• a second excitation light source structure generating a second excitation light incident on the wavelength conversion material from a second side, wherein the first and second excitation lights have the same color;
• wherein the wavelength conversion material absorbs the first and second excitation lights and generates a converted light having different wavelengths than the first and second excitation lights;
• a first light separation structure disposed on the first side of the wavelength conversion material to separate the converted light and the first excitation light;
• and
• a second light separation structure disposed on the second side of the wavelength conversion material to separate the converted light and the second excitation light.

An illumination device comprising:

• a wavelength conversion material;
• a first excitation light source structure generating a first excitation light incident on the wavelength conversion material from a first side;
• a second excitation light source structure generating a second excitation light incident on the wavelength conversion material from a second side;
• wherein the wavelength conversion material absorbs the first and second excitation lights and generates a converted light having different wavelengths than the first and second excitation lights;
• a first light separation structure disposed on the first side of the wavelength conversion material to separate the converted light and the first excitation light;
• and
• a second light separation structure disposed on the second side of the wavelength conversion material to separate the converted light and the second excitation light based on an etendue difference between the converted light and the second excitation light.