One-dimensional photonic band gap (PBG) materials created from holographic polymer dispersed liquid crystals (H-PDLCs) provide enhanced light localization in an organic electro-optic device. Distributed feedback within the reflection notch of a H-PDLC grating narrowed the bandwidth of pyrromethene 597 fluorescence from 56 to $8.4\mathrm{nm}$ at a lasing threshold of $0.12\mathrm{mJ}{\mathrm{cm}}^{-2}$ , compared to $2.6\mathrm{mJ}{\mathrm{cm}}^{-2}$ required to observe amplified spontaneous emission in a nonstructured, but comparable floodlit (PDLC) sample. Application of an electric field $\left(10–40\mathrm{V}∕\mu \mathrm{m}\right)$ continuously decreased the diffraction efficiency of the grating and the commensurate dynamic lasing intensity thus demonstrating electrically modulated gain from an optically pumped, all-organic PBG.