Abstract

We obtained upconversion (UC) light-emitting photonic materials (${\mathrm{YbPO}}_4\text{:}\mathrm{Er}$) with an inverse opal structure by the self-assembly technique in combination with a solgel method. The effect of the photonic stopband on the UC luminescence of the ${}^2{\mathrm{H}}_{11/2}$, ${}^4{\mathrm{S}}_{3/2}\to {}^4{\mathrm{I}}_{15/2}$, and ${}^4{\mathrm{F}}_{9/2,}\to {}^4{\mathrm{I}}_{15/2}$ transitions of ${\mathrm{Er}}^{3+}$ has been observed in the inverse opals of the ${\mathrm{Er}}^{3+}$-doped ${\mathrm{YbPO}}_4$. Significant suppression of the UC emission was detected if the photonic bandgap overlapped with the ${\mathrm{Er}}^{3+}$ ions emission band, while enhancement of the UC emission occurs if the emission band appears at the edge of the bandgap.

© 2011 Optical Society of America

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