Lasing and magnetic microbeads loaded with colloidal quantum dots and iron oxide nanocrystals

Minxu Li, Guanjun You, Andrew Y. Wang, Wenjia Hu, Jingkang Wang, Fengqing Sun, Yiming Zhu, Ron Henderson, Jian Xu

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


This study investigates the feasibility of loading nanostructured lasing medium and magnetic nanocrystals in the same microbead for potential applications in bio- and chemical sensing. A sequential infiltration process is proposed and tested for the preparation of magnetic and lasing microbeads by incorporating, respectively, iron oxide nanocrystals in the inner cores and colloidal quantum dots (CQDs) in the periphery regions of mesoporous silica microbeads. The co-doped bead structure was confirmed by electron microscopy and energy dispersive spectroscopy. The lasing action of the CQD gain medium in the mesoporous beads was characterized with micro-photoluminescence, revealing sharp whispering gallery mode lasing signatures, whereas the distinguishing superparamagnetic property was measured from the co-doped microbeads with vibrating sample magnetometry.

Original languageEnglish (US)
Pages (from-to)9598-9603
Number of pages6
Issue number20
StatePublished - Oct 21 2013

All Science Journal Classification (ASJC) codes

  • Materials Science(all)


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