Modified optical properties in a samarium doped titania inverse opal.
The TiO(2):Sm(3+) inverse opal has been prepared by a template-assisted method, and its modification on photoluminescent (PL) properties of Sm(3+) is studied. Transmittance spectra show a dip within the photonic bandgap, whose location shifts a little to red and then to blue with an increasing detection angle between the incident light and the surface normal; such an irregular shift is attributed to uneven shrinkage of lattices. Steady-state PL spectra indicate a spatial redistribution of emission lines. Decay kinetics demonstrate that the spontaneous emission rates of Sm(3+) ions in the inverse opal decrease to varied extent depending on the emission wavelength and detection angle. All the facts are examined to be consistent with the photonic bandgap effect.
Wang
Wei
W
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
Song
Hongwei
H
Liu
Qiong
Q
Bai
Xue
X
Wang
Yu
Y
Dong
Biao
B