Abstract
Thin film phosphors (TFPs) are generally less efficient than powder phosphors because a large fraction of the light generated within the film is lost by the wave-guiding effect. This study examined the effects of the grain size of sol-gel derived nanocrystalline Y2O3:Tb3+ TFPs on the extraction efficiency of emission light and the absorption of UV excitation light caused by Bragg scattering from an over-coated two-dimensional (2D) polystyrene (PS) photonic crystal layer (PCL). The total scattering enhancement of the integrated photoluminescence (PL) efficiency from the 20 mol % Li-doped TFP modified with the 580 nm 2D PS was 9.3 times higher than that of pure flat Y2O3:Tb3+. This was attributed to a combination of increased emission in the anomalous surface scattering enhancement of nanocrystalline films, and both emission and excitation in the Bragg scattering enhancement of 2D PCLs.
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