Luminescent properties of LPE-grown Ga
1-xAl
xP (

) structures have been studied over a wide temperature range. The complicated character of low-temperature luminescence is attributed to intrinsic and impurity-related recombination. The essential dependence of free exciton recombination upon temperature and composition is established for radiative Ga
1-xAl
xP structures. Anomalous and normal dependence of radiative efficiency on temperature has been shown to be characteristic of intrinsic and impurity-related luminescence. Thus the temperature dependence of the total luminescence can be controlled simply by varying the donor impurity doping level. LED\´s with luminous intensity

mcd at

K have been fabricated from the LPE-grown Ga
1-xAl
xP p-n structures which have high temperature stability of injection and breakdown luminescence efficiency, and emission band spectral position.