Narrowband photodiode vs LED
It's characteristic of the photoelectric effect that there is a minimum photon energy to stimulate a photocurrent, and thus a maximum wavelength detected. But there's no fundamental cut-off for shorter wavelengths. As such, you will not be likely to find a photodiode material that inherently has a strong response at 630 but a very weak response at 450 nm. This is also true if you use an LED as a photodiode.

You will likely have to introduce an optical filter of some kind into your system. This could be a coating on the photodiode surface, or on the window of the photodiode package; or it could be added somewhere in the optical path leading to the detector.