Preparation and photonic bandgap properties of lead lanthanum titanate inverse opal photonic crystals

The lead lanthanum titanate (PLT) inverse opal photonic crystals were prepared by the self-assembly technique in combination with a sol–gel method. In the preparation process, PLT precursors were filled into the interstices of the opal template assembled by monodispersive polystyrene microspheres. The polystyrene template was then removed by calcination at 650 °C for 5 h, meanwhile, a perovskite PLT inverse opal photonic crystal was formed. An optical micrograph shows that the PLT inverse opals reflect green–blue light strongly. Moreover, a photonic band gap was observed by reflective spectra of PLT sample.