Wavelength conversion device and illumination device

An illumination device comprising

• a light source and a wavelength conversion device, wherein
• the wavelength conversion device includes a wavelength converter having a plate shape, the wavelength converter has a light-receiving surface and a light-emitting surface, the wavelength converter converts a wavelength of incident light that is incident from the light-receiving surface and generates a wavelength-converted light, the wavelength converter emits the wavelength-converted light from the light-emitting surface, and a plurality of antennas are disposed on the light-emitting surface of the wavelength converter,
• the plurality of antennas form an antenna array in which the respective plurality of antennas are arranged with a predetermined period in a first region of the light-emitting surface, and the antenna array is absent in a second region outside the first region, and
• when the light source irradiate the light-receiving surface of the wavelength converter with a primary light,
• the wavelength converter converts a wavelength of a part of the primary light and generates a secondary light,
• the primary light and the secondary light having passed the wavelength converter reaches the light-emitting surface, and
• a relatively large amount of the secondary light reaches the first region, while a relatively large amount of the primary light reaches the second region.