| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light source device which can suppress a chance that an exciton in an excited phosphor returns to a ground state in a process of non-radiation (an exciton changes into a phonon) and an occurrence of excitation saturation, and thus make it possible to improve luminous efficiency and light emission intensity. <P>SOLUTION: A light source device has a phosphor layer 3 that light with a predetermined wavelength, emitted from a solid light source element 2, enters as an exciting light. The phosphor layer 3 excited by the exciting light entered causes fluorescent light to be generated and emits the fluorescent light outside. The light source device also has a metal layer 4 which is bonded on a predetermined outer surface of the phosphor layer 3 except an incidence surface the exciting light comes in and an output surface the fluorescent light goes out, and converts an exciton excited in the phosphor layer 3 into light through a surface plasmon polariton in a proximity of the predetermined surface. The light converted from the exciton through the surface plasmon polariton is emitted from the output surface of the phosphor layer 3 together with the fluorescent light. <P>COPYRIGHT: (C)2012,JPO&INPIT |
