Enhancement of photoluminescence due to one-dimensional photonic crystal

We report on interplay between photonic crystal and photoluminescence in a one-dimensional photonic crystal. The one-dimensional photonic crystal reflects light within a certain range of wavelength. This range of wavelength is called photonic band gap. We measured reflectivity by changing incident angle of probe light, so as to shift the region of large reflectivity. We found that photoluminescence is observed only when PL wavelength falls in the photonic band gap. This result indicates that PL is intensified due to photonic crystal.