[en] ${}^{18}$F-fluorination using aluminum-fluoride ([${}^{18}$F]AlF) chelate technique has been reported to give a low-to-moderate radiochemical yield, between 5 and 20%. Therefore, the work described here outlines the optimum ${}^{18}$F-fluorination condition for the formation of [${}^{18}$F]AlF${}^{2+}$ and [${}^{18}$F]AlF-NOTA-NHS complex with the radiochemical yield (RCY) and purity (RCP) of more than 90% as a prerequisite step before proceeding with the radiopharmaceutical preparation using the [${}^{18}$F]AlF-bifunctional chelator technique. As well as being simple, the suggested method is practical and relevant for beginners interested in ${}^{18}$F-fluorination with [${}^{18}$F]AlF-chelate complex technique or also for a researcher who aims to proceed on an extensive scale.