| 摘要 |
PROBLEM TO BE SOLVED: To provide a photodiode capable of reliable detection of fluorescent radiation with a simple configuration.SOLUTION: A photodiode 200 receives incident radiation having first and second spectral distributions, where the first spectral distribution is spectrally shifted from the second spectral distribution. The photodiode has a first semiconductor layer 211 capable of absorbing incident radiation 231 having the first spectral distribution without generating a photocurrent, while simultaneously transmitting incident radiation having the second spectral distribution to an intrinsic layer 212 for generating a photocurrent I. The photodiode may be used to detect the presence of target molecules that has been labeled with labeling agents, such as fluorophores or quantum dots. The labeling agents are characterized by having the Stokes shift and, therefore, they emit fluorescent radiation having the second spectral distribution that is spectrally shifted from the illumination radiation having the first spectral distribution. |
