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Since their discovery in 1991, 1 carbon nanotubes have attracted significant scientific attention. 2, 3 Many potential applications of carbon nanotubes require an understanding of their photoexcitedstate properties, but the insolubility of nanotubes in any solvent has hindered quantitative investigations. 4, 5 We have been able to solubilize carbon nanotubes by covalently attaching them to highly soluble linear polymers. Here we report an interesting finding that the polymer-bound carbon nanotubes in homogeneous organic and aqueous solutions are luminescent or strongly luminescent. Multiple-wall (MWNT) and single-wall (SWNT) carbon nanotubes were purified using the methods reported in the literature. 3, 9-11 Shortened MWNT (S-MWNT) and shortened SWNT (S-SWNT) were obtained via the procedures reported by Hiura, et al. 9 and Liu, et al., 3 respectively, and were characterized using FT-IR, Raman, and …