its said that indirect band gap semiconductors like silicon and germanium are not used as a light sources because they have more non-radiative recombinations rather than radiative ,which inturn decreases efficiency of optical source.
but i want to understand how indirect band gap materials...
hello friends....we all know that common collector transistor have higher input impedence and lower o/p impedence ....and this is very good for impedence matching....but i dont know how impedence matching is done by them....
can anyone help me out ????
thanks in advance....