Er3+-activated silica inverse opals synthesized by the solgel method

A. Chiappini; C. Armellini; A. Chiasera; Y. Jestin; M. Ferrari; M. Mattarelli; M. Montagna; E. Moser; C. Tosello; L. Zampedri; G. Nunzi Conti; S. Pelli; R. M. Almeida; G. C. Righini

doi:10.1007/s11801-007-6194-0

Optoelectronics Letters ›› 2007, Vol. 3 ›› Issue (3) : 184 -187. DOI: 10.1007/s11801-007-6194-0

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Er³⁺-activated silica inverse opals synthesized by the solgel method

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Abstract

We present the details of the sol-gel processing used to realize inverse silica opal, where the silica was activated with 0.3 mol% of Er³⁺ ions. The template (direct opal) was obtained assembling polystyrene spheres of the dimensions of 260 nm by means of a vertical deposition technique. The Er³⁺-activated silica inverse opal was obtained infiltrating, into the void of the template, the silica sol doped with Er³⁺ ions and subsequently removing the polystyrene spheres by means of calcinations. Scanning electron microscope showed that the inverse opals possess a fcc structure with a air hollows of about 210 nm and a photonic band gap, in the visible range, was observed from reflectance measurements. Spectroscopic properties of Er³⁺-activated silica inverse opal were investigated by luminescence spectroscopy, where, upon excitation at 514.5 nm, an emission of ⁴I_13/2 → ⁴I_15/2 of Er³⁺ ions transition with a 21 nm bandwidth was observed. Moreover the ⁴I_13/2 level decay curve presents a single-exponential profile, with a measured lifetime of 18 ms, corresponding a high quantum efficiency of the system.

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A. Chiappini, C. Armellini, A. Chiasera, Y. Jestin, M. Ferrari, M. Mattarelli, M. Montagna, E. Moser, C. Tosello, L. Zampedri, G. Nunzi Conti, S. Pelli, R. M. Almeida, G. C. Righini. Er³⁺-activated silica inverse opals synthesized by the solgel method. Optoelectronics Letters, 2007, 3(3): 184-187 DOI:10.1007/s11801-007-6194-0

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