A structure is provided that includes a partition plate that separates a first space from a second space, in which the first space is filled with a gas that emits light of a first color when irradiated with laser light, the second space is filled with a gas that emits light of a second color when irradiated with the laser light, and the partition plate contains a phosphor that emits light of a third color when irradiated with the laser light. The structure may be cylindrical and the partition plate may be spiral-shaped. Alternatively, the structure may be prismatic and the partition plate may be flat plate-shaped.