Color Control in Coaxial Two-Luminophore Nanowires

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• 作者：Alexandre Garreau ; Florian Massuyeau ; St茅phane Cordier ; Yann Molard ; Eric Gautron ; Patricia Bertoncini ; Eric Faulques ; Jany Wery ; Bernard Humbert ; Alain Bulou ; Jean-Luc Duvail
• 刊名：ACS Nano
• 出版年：2013
• 出版时间：April 23, 2013
• 年：2013
• 卷：7
• 期：4
• 页码：2977-2987
• 全文大小：625K
• 年卷期：v.7,no.4(April 23, 2013)
• ISSN：1936-086X

文摘

We report a general and simple approach to take control of the color of light-emitting two-luminophore hybrid nanowires (NWs). Our strategy is based on the spatial control at the nanoscale (coaxial geometry) and the spectral selection of the two kinds of luminophores in order to restrict complex charge and energy transfers. Thus, it is possible to control the color of the photoluminescence (PL) as an interpolation of the CIE (Commission Internationale de l鈥橢clairage) coordinates of each luminophore. For this purpose, we selected a green-emitting semiconducting polymer and a red-emitting hexanuclear metal cluster compound, (n-Bu₄N)₂Mo₆Br₈F₆, dispersed in a poly(methyl-methacrylate) (PMMA) matrix. The great potential and the versatility of this strategy have been demonstrated for two configurations. First, a yellow PL with a continuous change along the nanowire has been evidenced when the proportion of the PPV shell versus the nanocomposite core, that is, the green/red volumic ratio, progressively shifts from 1:2 to 1:5. Second, an extremely abrupt change in the PL color with red-green-yellow segments has been achieved. A simple model corroborates the effectiveness of this strategy. PL excitation and time-resolved experiments also confirm that no significant charge and energy transfers are involved. The two-luminophore hybrid nanowires may find widespread nanophotonic applications in multicolor emitting sources, lasers and chemical and biological sensors.

Keywords:

hybrid nanomaterial; coaxial nanowire; light-emitting polymer; cluster compounds; luminescence; energy transfer; nanophotonics