Upconversion luminescence of colloidal CdS and ZnCdS semiconductor quantum dots

Jianying Ouyang, John A. Ripmeester, Xiaohua Wu, David Kingston, Kui Yu*, Alan G. Joly, Wei Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)


Upconversion luminescence is observed from colloidal CdS and CdZnS quantum dots dispersed in hexanes. These binary and ternary nanocrystals were synthesized via noninjection approaches and at relatively low temperature and exhibit cubic crystal structures and narrow size distributions. The upconversion luminescence of these nanocrystal ensembles is similar to their corresponding photoluminescence emission, regarding peak shape, position, and dynamics. The upconversion luminescence yield exhibits a near-quadratic laser power dependence. Accordingly, our study indicates that the upconversion luminescence is due to two-photon excitation.

Original languageEnglish
Pages (from-to)16261-16266
Number of pages6
JournalJournal of Physical Chemistry C
Issue number44
Publication statusPublished - 8 Nov 2007
Externally publishedYes


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