Long-lifetime emission in luminescent colloidal silica

Calcination of aminopropylsilica spheres generates colloidal silica with tailorable luminescence properties depending on the calcination conditions. After calcining at 550 ° C for 20 h , photoexcited luminescent colloidal silica exhibits a bright blue emission ( λ max = 375 nm , 3.3 eV ) followed by...

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Bibliographic Details
Published in:	Applied physics letters Vol. 91; no. 9; pp. 091909 - 091909-3
Main Authors:	Soriano, Ronald B., Kpatcha, Essoyodou, Jakob, Adam M., Merkert, Jon W., Carlin, Clifford M., Schmedake, Thomas A.
Format:	Journal Article
Language:	English
Published:	American Institute of Physics 27-08-2007
Online Access:	Get full text
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Summary:	Calcination of aminopropylsilica spheres generates colloidal silica with tailorable luminescence properties depending on the calcination conditions. After calcining at 550 ° C for 20 h , photoexcited luminescent colloidal silica exhibits a bright blue emission ( λ max = 375 nm , 3.3 eV ) followed by a long-lifetime green photoluminescence centered around 500 nm ( 2.5 eV ) , which lasts for more than 10 s at room temperature. Time resolved temperature studies indicate that the long-lifetime green photoluminescence can be fitted by a multiexponential decay function consisting of a regular exponential term and a stretched exponential term with a temperature independent beta parameter consistent with a hopping mechanism.
ISSN:	0003-6951 1077-3118
DOI:	10.1063/1.2771372