Robust Circular Polarized Emission from Nanoscopic Single-Molecule Sources: Application to Solid State Devices.

Title

Robust Circular Polarized Emission from Nanoscopic Single-Molecule Sources: Application to Solid State Devices.

Subject

Polarized fluorescence (circularly; robust circular polarized emission from nanoscopic single mol. sources and application to solid state devices); Circular dichroism (fluorescence-detected; robust circular polarized emission from nanoscopic single mol. sources and application to solid state devices); Circularly polarized luminescence; Fluorescence; Luminescence (robust circular polarized emission from nanoscopic single mol. sources and application to solid state devices); Chirality; Optical activity (robust circular polarized emission from nanoscopic single mols. in dependence on)

Description

Controlling the polarization state of fluorescence emission in solid state devices is an important goal in optical display technologies. High-purity (right or left) circular polarized emission is particularly desirable because an arbitrary linearly polarized state can be generated with much higher efficiency (lower loss) as compared with a nonpolarized fluorescence input. Here the authors discuss observation of resonant chiroptical effects (fluorescence detected CD (FDCD), and circular polarized luminescence (CPL)) from single (bridgedtriarylamine)helicene mols. in a solid-film format. In the FDCD expt. using 457-nm excitation, single-mol. fluorescence from enantiomerically pure helicene samples show surprising distributions of dissymmetry (g)-parameters centered near zero but with a significant contribution from mols. showing an almost perfectly pure response to either right or left circularly polarized light. Expts. combining a well-defined circularly polarized excitation (either right or left) with decompn. of the fluorescence into left- and right-circular polarization component show only a weak correlation between the dissymmetry (sign and magnitude) of the CPL with the polarization state of the input. Current efforts are directed at wavelength resolved CPL, FDCD at wavelengths that are more closely match to bulk CD features, and orientational dependence of FDCD and CPL. These results provide new insight into chiroptical properties of chiral fluorophores at the single mol. level and suggest new optical device possibilities. [on SciFinder(R)]

Source

MRS Proceedings, 965. doi:10.1557/PROC-0965-S12-08

Publisher

Materials Research Society Symposium Proceedings

Date

2007

Contributor

Hassey, Ruthanne; Swain, Ellen J.; Hammer, Nathan I.; Richards, Emily L.; Venkataraman, Dhandapani; Barnes, Michael D.

Language

written in English

Coverage

Optical, Electron, and Mass Spectroscopy and Other Related Properties