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Eu$^{2+}$ is used to replace toxic Pb$^{2+}$ in metal halide perovskitenanocrystals (NCs). The synthesis implies injection of cesium oleate into asolution of europium (II) bromide at an experimentally determined optimumtemperature of 130C and a reaction time of 60s. Structural analysis indicatesthe formation of spherical CsEuBr$_3$ nanoparticles with a mean size of 43nm.Using EuI$_2$ instead of EuBr$_2$ leads to the formation of 18nm CsInanoparticles, while EuCl$_2$ does not show any reaction with cesium oleateforming 80nm EuCl2 nanoparticles. The obtained CsEuBr3 NCs exhibit bright blueemission at 413nm (FWHM 30 nm) with a room temperature photoluminescencequantum yield of 39%. The emission originates from the Laporte-allowed4f7-4f65d1 transition of Eu$^{2+}$ and shows a PL decay time of 263ns. Thelong-term stability of the optical properties is observed, making inorganiclead-free CsEuBr$_3$ NCs promising deep blue emitters for optoelectronics.

Eu$^{2+}$: a suitable substituent for Pb$^{2+}$ in CsPbX$_3$ perovskite nanocrystals?