XRD patterns, FE-SEM image, and transmission spectrum of the films. (a) XRD patterns of the (Y0.96Tb
)2O3 (0 ≤ x ≤ 0.04) oxide films (lines a-f) calcined from the LRH films constructed with exfoliated nanosheets, where (a)-(f) correspond to x = 0, 0.01, 0.02, 0.03, 0.035, and 0.04, respectively. Line (g) in (a) is for the LRH nanosheet film (x = 0.035). (b) and (c) are FE-SEM image and transmission spectrum of the (Y0.96 Tb0.035Eu0.005
2O3 film, respectively. The inset in (b) is the cross-section view of the film.