Photo detector having sensor element array and photo conversion element, and method for fabricating the same

A photo detector, comprising:

• a first substrate, having a sensor element array for receiving light with a spectrum in a specific wavelength range;
• a photo conversion element, disposed on the sensor element array, wherein the photo conversion element comprises a photo conversion material layer and a doped photo conversion material column structure layer, a luminescent spectrum of the doped photo conversion material column structure layer is overlapped with the spectrum in the specific wavelength range, and a luminescent spectrum of the photo conversion material layer is non-overlapped with the spectrum in the specific wavelength range;
• and
• a second substrate disposed opposite to the first substrate, wherein the photo conversion element is disposed on the second substrate, a reflective layer is further disposed between the second substrate and the photo conversion element, and the photo conversion material layer is located between the reflective layer and the doped photo conversion material column structure layer.