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Blue- and red-emitting phosphor nanoparticles embedded in a porous matrix

Abstract : Eu3+- and Ce3+-doped yttrium silicate, as well as Eu2+-doped zinc silicate nanoparticles, were grown in a porous SiO2 matrix using an impregnation method. For Y2Si2O7:Eu3+, particles of about 50 nm size were obtained that exhibited several photoluminescence (PL) peaks in red. Different peaks showed slightly different decay times; however, their excitation mechanism was found the same. Increasing the Eu concentration increased the PL intensity while reducing the decay time. Y2Si2O7:Ce3+ nanoparticles in the porous matrix showed bright blue emission, consisting of two peaks at 358 nm and 378 nm. Re-impregnation process was found effective in changing the relative intensity of the two peaks. Zn2SiO4:Eu2+ nanoparticles in porous glass consisted of amorphous particles of about 20 nm size inside the porous matrix. The luminescence was a broad peak centered at 418 nm. These phosphor systems, together with our previously reported Zn2SiO4:Mn2+ in porous SiO2 structure, comprise a red–green–blue system that can be used in display applications.
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Submitted on : Wednesday, September 25, 2019 - 3:07:02 PM
Last modification on : Sunday, June 26, 2022 - 4:43:51 AM

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N. Taghavinia, Gilles Lerondel, H. Makino, T. Yao. Blue- and red-emitting phosphor nanoparticles embedded in a porous matrix. Thin Solid Films, Elsevier, 2006, 503 (1-2), pp.190-195. ⟨10.1016/j.tsf.2005.11.052⟩. ⟨hal-02296794⟩



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