The self-assembled monolayer periodic array of polystyrene spheres conformally coated with TiO2 layer using atomic layer deposition is designed to obtain a further enhancement of light extraction for LYSO scintillator.
The maximum enhancement is 149% for the sample with polystyrene spheres conformally coated with TiO2 layer, while the enhancement is only 76% for the sample with only polystyrene spheres. Such further enhancement could be contributed from the additional modes forming by TiO2 layer due to its high refractive index, which can be approved by the simulation of electric field distribution. The experimental results are agreement with the simulated results.
Furthermore, the prepared structured layer exhibits an excellent combination with the surface of LYSO scintillator, which is in favor of the practical application. Therefore, it is safely concluded that the combination of self-assembly method and atomic layer deposition is a promising approach to obtain a significant enhancement of light extraction for a large area. This method can be extended to many other luminescent materials and devices.
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