The energy transfer from Tb 3+ to Eu 3+ co-doped TiO 2( TiO 2: Tb , Eu ) inverse opal photonic crystals was investigated by photoluminescence. The results showed that the photonic band gap enhanced energy transfer from the donor Tb 3+ to the acceptor Eu 3+. When the fluorescence emission wavelength of Tb 3+ overlaps with the photonic band gap, the fluorescence intensity of Tb 3+ is suppressed, while the fluorescence intensity of Eu 3+ is enhanced. Energy transfer efficiencies were attributed to the tuning effects of energy transfer in the photoluminescence process by photonic crystal structure.
Photonic band gap effect and structural color from silver nanoparticle gelatin emulsion
