Lijia Liu: XEOL studies of Light-Emitting Materials

X-ray excited optical luminescence (XEOL) is a photon-in-photon-out process which monitors the visible luminescence emitted from materials upon X-ray excitation. Unlike using low energy excitation source such as UV, during X-ray excitation, core electrons are excited and the production of luminescence is a much more complicated process. Because of this, X-ray excited luminescence can be correlated with the decay process of a specific core electron. In this talk, I will introduce the fundamental process of XEOL and the unique information it provides, when combining with X-ray absorption near-edge structure (XANES), in revealing the origin of the luminescence. Two materials systems, nanostructured TiO2 and metal-doped lead halide perovskite, will be used as examples to demonstrate the XEOL-XANES analysis technique.

References:

1. Li et al, https://doi.org/10.1021/acs.chemmater.5b00363
2. Ma et al, https://doi.org/10.1039/c9nr00143c