Abstract
Photoluminescence microscopy has been used to interrogate individual nanoaggregates (NAs) of visible light excitable Eu(III)-complex species with 9-hydroxyphenalenone which we found to emit near-white light in methanol. In the solid state however, NAs display diverse emission spectra due to varied sensitization efficiencies, and thereby exhibit a wide range of emission colours. Heterogeneity in sensitization efficiency and asymmetry ratios for Eu-emission is intriguing because all measurable photoluminescence parameters are expected to average out over large number of Eu-complex species which constitute NAs, and suggests the existence of relatively few yet efficient Eu3+ radiative trap centres of varied asymmetry within NAs.
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