The blending of [n]CPPs with PCL yielded excellent fluorescent properties after exposing them to UV radiation (Figure ). A range of concentrations was visualized under both ambient visible and UV light excitation conditions, with [8]CPP concentrations from 0.0001 wt.% up to 1 wt.% (Figure ). The optimal ratio of [8]CPP to PCL was determined to be 0.01 wt.%, since it provided the bulk material with a strong fluorescent signal (Figure This lack of fluorescence to the naked eye under ambient visible light was also observed at 0.01 wt.% for both [9]CPP-PCL and [10]CPP-PCL samples (Figure ). The fluorescent capabilities of [n]CPPs and [n]CPP-PCL blends provide additional dimensions for microscopy, as the multiple emission wavelengths result from the singular excitation wavelength. While the [n]CPPs have an absorption peak at 340 nm, readily available UV flashlights that use 365 nm still result in bright emissions, even at such low concentrations, with a red shift occurring as the [n]CPP's cyclic radius decreases. This red shift results in the [8], [9], and [10]CPP having fluorescent emissions in the 533 nm, 494 nm, and 466 nm wavelengths respectively. The reason for this common absorbance is due to the CPPs having Laporte forbidden HOMO-LUMO transitions coupled with the fact that the higher energy allowed transitions (e.g. HOMO to LUMO+1) are similar in energy for all nanohoop sizes . In contrast, the emissive properties of