| 摘要 |
PURPOSE:To obtain a device of high photosensitivity wherefrom color image bright even by a room light is obtained by a method wherein a fluorescent film which is transparent in the range of specific wavelengths, and emits a light in the range of said specific wavelengths by absorbing the light in the range of wavelengths different therefrom is provided on a photosensor of the picture element part of a solid-state image pickup element. CONSTITUTION:The crystalline fluorescent film 12 constituted of sulfides, silicates, phosphates, etc. is formed on the photo diode B corresponded to e.g. a blue filter on the solid-state image pickup element wherein the picture element part 2 consisting of a drive circuit 3, a transfer part, and a photo diode part are previously formed. Now, when Ag doped ZnS-CdS is used as the fluorescent film, wavelengths of emitting fluorescence can be controlled as the curve shown in the figure. When the density of CdS in the figure is 40%, the wavelength of emission becomes 0.55mum; when a ZnSe-Zn1-xCdxTe film is used as the photo diode, the wavelength can be made to coincide with the maximum range of wavelength 0.55mum, and the sensitivity becomes twice or more compared with the case when the blue light is used as it is. Besides, the same treatment is applied also to green and red. |
