Suppose, for a particular compound AX, the relative ratio of effective masses (D=mh/me) is found to be 2 and exciton binding energy(Eb) to be 0.8 eV. After applying strain on this compound, the D is 1.5 and Eb is found 0.6 eV.

As we know, a higher relative ratio means a higher separation affinity of electron-hole pairs (lower chance of recombination), whereas lower exciton binding energy means a higher tendency to decompose into free charges, and a lower chance of direct recombination.

Then what could be the possible reason behind the conditradictory result? ( lower ratio and lower binding energy or vice versa)