  We study the effect of one-dimensional (1D) photonic crystal heterojunction
(h-PhC) on the light absorption and light emission of monolayer molybdenum
disulfide (MoS$_{2}$), and obtained the analytical solution of the light
absorption and emission of two-dimensional materials in 1D h-PhC.
Simultaneously enhancing the light absorption and emission of the medium in
multiple frequency ranges is easy as h-PhC has more models of photon
localization than the common photonic crystal. Result shows that h-PhC can
simultaneously enhance the light absorption and emission of MoS$_{2}$ and
enhance the photoluminescence spectrum of MoS$_{2}$ by 2-3 orders of magnitude.
