“…The FL intensities of the hybrid microparticles with 65% hollow interior were increased by 1.9, 1.7, 2.2, and 3.5 times at 519, 560, 600, and 800 nm, respectively, compared with the microparticles bearing 17% hollow interiors. These results were in line with the reports stating that TiO 2 particles with a hollow interior can enhance the scattering of light, thereby enhancing the blocking of incident light . TiO 2 films with hollow voids also exhibited similar effects …”