Abstract
Room temperature tunable blue-green photoluminescence was observed in nanocrystalline (Pb1−xSrx)TiO3 thin film under UV excitation. Its emission energy increases from 2.42 (at x=0.6) to 2.76 eV (at x=0.4), while the band gap decreases from 3.6 to 3.3 eV. Thin films of (Pb1−xSrx)TiO3 were prepared on yttrium-doped zirconia substrate by a simple sol-gel technique with spinning-coating process. Atom force microscope micrographs and crystallographic studies revealed the polycrystalline perovskite-type structure of the thin films. The observed optical properties are attributed to distorted octahedral due to different cation substitutions. The work shows that this kind of wide band gap and low cost nanocrystalline thin films is a very promising material for flat panel display applications and integrated light emission devices.
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