Effect of Zn[sup 2+] and Mn[sup 2+] introduction on the luminescent properties of colloidal ZnS:Mn[sup 2+] nanoparticles

Li Chen; Jiahua Zhang, Seungwon; Luo, Yongshi; Shaozhe Lu; Xiaojun Wang
January 2004
Applied Physics Letters;1/5/2004, Vol. 84 Issue 1, p112
Academic Journal
We report the observation of photoluminescence (PL) enhancement and quenching for 580 nm emission following the variation of time decay patterns, induced by Zn[sup 2+] and Mn[sup 2+] introduction, respectively, in colloidal ZnS:Mn[sup 2+] nanoparticles (NPs). The activation and quenching processes are analyzed considering surface nonradiative relaxation based on the Langmuir isotherm and Poisson statistics, respectively. The PL enhancement is most likely related to the elimination of dangling bonds from the lone pairs on surface S[sup 2-] anions. The results indicate that rich Zn[sup 2+] and poor Mn[sup 2+] in colloidal ZnS:Mn[sup 2+] NPs are the key to obtain highly efficient luminescence. © 2004 American Institute of Physics.


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