Abstract

Three-dimensional-ordered Yb/Er co-doped Bi<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> inverse opal, powder, and disordered reference samples are prepared and their upconversion (UC) emission properties and mechanisms are investigated. Significant suppression of UC emission is detected when the photonic band-gaps overlap with Er<sup>3+</sup> UC green emission bands. Interestingly, green and red UC emissions follow a two-photon process in the powder sample but a three-photon one in the inverse opal.

© 2013 Chinese Optics Letters

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