Fig. 2

a Dependence of FWHM (squares) and peak intensity (spheres) of POFP films (135 nm) at various pump intensities. b The evolution of emission spectrum of POFP films (135 nm) with increasing pump intensity
a Dependence of FWHM (squares) and peak intensity (spheres) of POFP films (135 nm) at various pump intensities. b The evolution of emission spectrum of POFP films (135 nm) with increasing pump intensity