NOVELTY - The red, green and/or blue color units (100) comprise a first p-type electrode layer (110) disposed on a light receiving side of the color unit, a second p-type electrode layer (120) disposed under the first p-type electrode layer, an n-type electrode layer (130) disposed under the second p-type electrode layer, an exciton blocking layer (140) to block excitons generated in the first p-type electrode layer from transferring to the first p-type electrode layer and the second p-type electrode layer, and a first electrode layer disposed on the first p-type electrode layer.    USE - The red, green and/or blue color units are useful in an imaging device such as a charge coupled device image sensor or a complementary metal oxide semiconductor image sensor (all claimed) and camera including digital cameras, broadcasting cameras, security cameras, computer video cameras, camcorders, automobile sensors, home sensors, solar cells and various other devices.    ADVANTAGE - The red, green and/or blue color units can be economically, easily and rapidly produced with reduced size and high efficiency, provide high image quality in the imaging device, and reduce or prevent the decrease in sensitivity, false-color images, moire phenomenon and the decrease in resolution of the imaging device in an effective manner.    DETAILED DESCRIPTION - The red, green and/or blue color units (100) comprise a first p-type electrode layer (110) disposed on a light receiving side of the color unit, a second p-type electrode layer (120) disposed under the first p-type electrode layer, an n-type electrode layer (130) disposed under the second p-type electrode layer, an exciton blocking layer (140) to block excitons generated in the first p-type electrode layer from transferring to the first p-type electrode layer and the second p-type electrode layer, a first electrode layer disposed on the first p-type electrode layer, a hole transport layer disposed between the first electrode layer and the first p-type electrode layer, an intrinsic layer disposed between the second p-type electrode layer and the n-type electrode layer, a second electrode layer disposed under the n-type electrode layer, and a buffer layer disposed between the n-type electrode layer and the second electrode layer. The first p-type electrode layer includes a light-absorptive organic material, which selectively absorbs a wavelength other than a desired wavelength corresponding to red, green and blue light regions of a visible light band of an electromagnetic spectrum. The second p-type electrode layer includes a light-absorptive organic material, which absorbs a desired wavelength. The n-type electrode layer includes an organic material, where photoelectric conversion is performed through a p-n junction between the second p-type electrode layer and the n-type electrode layer and light of the desired wavelength is converted into electrical current. The first p-type electrode layer and the second p-type electrode layer have a band gap energy of 2-3.5 eV. The red light region has a band gap energy of 2-2.2 eV. The green light region has a band gap energy of 2.4-2.5 eV. The blue light region has a band gap energy of 3.1-3.2 eV. The exciton blocking layer has a band gap energy of 0.1 eV greater than a band gap energy of the first p-type electrode layer, and blocks a light having a wavelength of 500-600 nm, a light having a wavelength of 400-500 nm, and/or a light having a wavelength of less than 400 nm. The intrinsic layer is formed by co-depositing a p-type organic material and an n-type organic material. The first electrode layer, the hole transport layer, the first p-type electrode layer, the exciton blocking layer, the second p-type electrode layer, the n-type electrode layer, the buffer layer and the second electrode layer are sequentially stacked from the light receiving side of the color unit. The hole transport layer has a thickness of 20-50 nm. The first p-type electrode layer has a thickness of 80-250 nm. The exciton blocking layer, the second p-type electrode layer, the intrinsic layer, and the n-type electrode layer have a thickness of 5-50 nm. The buffer layer has a thickness of 1-20 nm. The first and second electrode layers have a thickness of 10-300 nm. The thickness of the first p-type electrode layer is greater as compared that the intrinsic layer is not disposed, when the intrinsic layer is disposed between the second p-type electrode layer and the n-type electrode layer INDEPENDENT CLAIMS are included for:    (1) a method of fabricating a color unit; and    (2) an imaging device.    DESCRIPTION OF DRAWING(S) - The diagram shows a cross-sectional view of a color unit.    Color unit (100)    First p-type electrode layer (110)    Second p-type electrode layer (120)    N-type electrode layer (130)    Exciton blocking layer. (140)