Transient Grating Photoluminescence Spectroscopy: An Ultrafast Method of Gating Broadband Spectra.
Ultrafast photoluminescence (PL) spectroscopy can cleanly resolve excited-state dynamics and coupling to the environment, however, there is a demand for new methods that combine broadband detection and low backgrounds. We present a new method, transient grating photoluminescence spectroscopy (TGPLS), that addresses this challenge by exploiting a focusing geometry where ultrafast broadband spectra are transiently diffracted away from the background PL. We show that TGPLS can resolve the complex spectral relaxation observed in conjugated polymer and oligomer solutions, with an essentially flat spectral response throughout the visible region and potentially beyond. The benefits we demonstrate using TGPLS could expand access to spectral information, particularly for other multichromophoric and heterogeneous materials where complex spectral relaxation is expected.
The MacDiarmid Institute for Advanced Materials and Nanotechnology, PO Box 600, Wellington 6010, New Zealand.|School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6010, New Zealand.
Kai
K
Chen
The MacDiarmid Institute for Advanced Materials and Nanotechnology, PO Box 600, Wellington 6010, New Zealand.|School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6010, New Zealand.
Joseph K
JK
Gallaher
The MacDiarmid Institute for Advanced Materials and Nanotechnology, PO Box 600, Wellington 6010, New Zealand.|School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6010, New Zealand.
Alex J
AJ
Barker
The MacDiarmid Institute for Advanced Materials and Nanotechnology, PO Box 600, Wellington 6010, New Zealand.|School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6010, New Zealand.
Justin M
JM
Hodgkiss
broadband fluorescence; oligothiophene; polythiophene; transient grating; ultrafast fluorescence; β-carotene