| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a wavelength conversion element capable of converting incident light of any wavelength into light of a shorter wavelength, and to provide a wavelength conversion device using the same. SOLUTION: The wavelength conversion element includes a unit element 32 and a unit element 33. The unit elements 32, 33 include barrier layers 41, 43 and well layers 42, 44. The barrier layers 41, 43 are formed of AlAs, and the well layers 42, 44 are formed of GaAs. An electron 51 excited at a sub- energy level 11 in the well layer 42 of the unit element 32 reaches a sub-energy level 15 in the well layer 44 via a sub-energy level 21 in the barrier layer 43. Moreover, a positive hole 52 generated in the well layer 42 of the unit element 33 reaches the well layer 44 of the unit element 32 via the barrier layer 41. Then, the electron 51 at the sub-energy level 15 is re-coupled with the positive hole at a sub-energy level 17, and thereby the exit light is emitted.</p> |
