We report on the fabrication of TiO2 nanospheres (NSs) monolayer arrays for enhancement of light extraction quantum efficiency of GaN-based light-emitting diodes (LEDs). The fabricated TiO2 NSs monolayer arrays composed of different phases of anatase (An-) and amorphous (Am-) TiO2, the arrays were transferred onto the topmost layer of LED chips via facile icing transfer method. The LED chips covered with Am-TiO2 NSs monolayer arrays shows 3.0- times enhanced light output power intensity compared with reference LED chips at a fixed injection current of 100 mA. The enhanced light extraction of LED chips by Am-TiO2 NSs monolayer can be attributed to an high transmittance (91.1%) in visible and increased light extraction probability of photons generated in LEDs, resulting from the enhanced light coupling efficiency by reduced total internal reflection (TIR). Finite-difference time-domain (FDTD) simulation results also agreed well with the experimentally observed results. Based on the experimental and theoretical results, our suggested Am- and An-TiO2 NSs arrays can be considered as a very facile and effective method to improve the device performance of various visible LEDs chips.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.