Tailoring the photoluminescence of BaMoO4 and BaWO4 hierarchical architectures via precipitation induced by a fast precursor injection

•BaMoO4 and BaWO4 synthesized via precipitation induced by a fast precursor injection.•Morphological aspects and optical properties controlled by the temperature and time.•Hierarchical structures grown by oriented attachment and matter transfer.•Photoluminescence spectra tailored by the morphological features.