Abstract
Upconversion (C) light-emitting photonic band gap materials (YBO 3: Yb, Er) with inverse opal structure were prepared by a self-assembly technique in combination with a sol–gel method. The effect of the photonic stop-band on the upconversion luminescence of Er 3+ ions has been investigated in the YBO 3: Yb, Er inverse opals. Significant suppression of the green or red UC emission was detected if the photonic band-gap overlaps with the Er 3+ ions emission band. We successfully achieved the color tuning of the UC optical properties of the inverse opal by controlling the structure of the photonic crystal.
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