Visible Luminescence from Octadecylsilane Monolayers on Silica Surfaces : Time-Resolved Photoluminescence Characterization

T. Uchino (1) , N. Sagawa (1)

1 Dep. of Chemistry

We have found that the adsorption of octadecyltrichlorosilane (OTS) monolayers on nanometer-sized silica particles yields a stable blue photoluminescence (PL) with a time scale of nanoseconds (N. Sagawa and T. Uchino, Appl. Phys. Lett. 87, 251923 (2005)). The observed PL intensity increases after curing at temperatures from 100 to 300 °C, suggesting that condensations between adjacent OTS molecules on the silica surface are related to the PL. The PL decay curve of the cured samples remains unchanged from 77 to 450 K, whereas the time-integrated PL intensity shows a monotonous decrease with increasing temperature. From these experimental results, a model of radiative and nonradiative process associated with the PL is presented.

Mots clés: blue photoluminescence; nanometer-sized silica particles; time-resolved photoluminescence

Domaines: Science des matériaux [cond-mat.mtrl-sci]

T. Uchino, N. Sagawa. Visible Luminescence from Octadecylsilane Monolayers on Silica Surfaces : Time-Resolved Photoluminescence Characterization. ENS 2006, Dec 2006, Paris, France. pp.5-8. ⟨hal-00166755⟩