Rare-earth-doped nanocrystalline Titania microspheres emitting luminescence via energy transfer

Rare-earth-doped nanocrystalline titania microspheres are prepared using an inexpensive and scalable ultrasonic spray pyrolysis method. Anatase titania nanocrystals distributed inside these microspheres function as sensitizers to absorb light and transfer energy to rare earth ions, which leads to intense and narrow bandwidth emission.