Novel pH Induced Reversible Luminescent Lanthanide Hydrogels


Two lanthanide complexes were encapsulated into silica matrix (aminopropyltriethoxysilane, APTS) via a mild sol–gel technique, resulting in two luminescent xerogels. Subsequently two novel luminescent polymeric hydrogels were successfully fabricated by incorporating these two lanthanide xerogels into the poly(acrylamide) matrix. The europium-ion-containing hydrogel can be sensitized by visible light (408 nm). More interestingly, the emissions of the Ln(III)-containing hydrogel can be switched “on-and-off” reversibly by a change of the pH value. The resulting color change can easily be observed by naked eyes. These luminescent hydrogels exhibited high stabilities in comparison with xerogels in aqueous media.

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Q. M. appreciates National Natural Science Foundation of China (21002035) and Z. Zhou thanks for the Scientific Research Foundation of Graduate School of South China Normal University (No. 2012kyjj240).

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Correspondence to Qianming Wang.

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Zheng, Y., Pang, S., Zhou, Z. et al. Novel pH Induced Reversible Luminescent Lanthanide Hydrogels. J Clust Sci 24, 449–458 (2013).

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  • Luminescent
  • Hydrogel
  • pH
  • Lanthanide