| 摘要 |
PROBLEM TO BE SOLVED: To shorten the distance from an electron generation point to a luminescence point and to allow luminescence on a face by providing a medium generating electrons when receiving the light of a photoelectric material, a medium generating light when receiving the electrons of a fluorescent material, and a means feeding energy to electrons. SOLUTION: A reflecting face 40 of light and the face of a fluorescent material 30 are overlappingly arranged, and a voltage is applied between the fluorescent material 30 and a photoelectric material 20. When light hits the photoelectric material 20, for example, electrons are generated on the photoelectric material 20, electrons are accelerated toward the fluorescent material 30 because the voltage is applied, and light is generated when the electrons hit the fluorescent material 30. Light is sent toward the photoelectric material 20 after hitting the reflecting face 40. Part of the light generated by the fluorescent material 30 is sent to the photoelectric material 20 without hitting the reflecting face 40. If the quantity of this light is sufficient, no reflecting face 40 is required, and part of the light is extracted to the outside. Part of the remaining light is sent to the photoelectric material 20 to generate electrons again, the electrons are accelerated to hit the fluorescent material 30, thus the luminescence of the whole device can be continued.
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