论文标题
eu $^{2+} $：cspbx $ _3 $ perovskite nanocrystals中的Pb $^{2+} $的合适取代基？
Eu$^{2+}$: a suitable substituent for Pb$^{2+}$ in CsPbX$_3$ perovskite nanocrystals?
论文作者
论文摘要
EU $^{2+} $用于在金属卤化物钙钛矿纳米晶体（NCS）中替换有毒的Pb $^{2+} $。该合成意味着将剖腹产注射到实验确定的最佳温度为130°C和60s的反应时间的最佳最佳温度下，将其注射到Europium（II）溴化物溶液中。结构分析表明，平均大小为43nm的球形CSEUBR $ _3 $纳米颗粒的形成。使用EUI $ _2 $而不是EUBR $ _2 $导致形成18NM CSI纳米颗粒，而EUCL $ _2 $没有显示出与形成80nm Eucl2 eucl2纳米颗粒的瓶中的任何反应。获得的CSEUBR3 NCS在413nm（FWHM 30 nm）时表现出明亮的蓝色发射，室温光致发光量子产率为39％。该发射源自Laporte允许的4F7-4F65D1 EU $^{2+} $的过渡，并显示了263ns的PL衰减时间。观察到光学性质的长期稳定性，使无机无铅CSEUBR $ _3 $ NCS有望用于光电子的深蓝色发射器。
Eu$^{2+}$ is used to replace toxic Pb$^{2+}$ in metal halide perovskite nanocrystals (NCs). The synthesis implies injection of cesium oleate into a solution of europium (II) bromide at an experimentally determined optimum temperature of 130C and a reaction time of 60s. Structural analysis indicates the 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 CsI nanoparticles, while EuCl$_2$ does not show any reaction with cesium oleate forming 80nm EuCl2 nanoparticles. The obtained CsEuBr3 NCs exhibit bright blue emission at 413nm (FWHM 30 nm) with a room temperature photoluminescence quantum yield of 39%. The emission originates from the Laporte-allowed 4f7-4f65d1 transition of Eu$^{2+}$ and shows a PL decay time of 263ns. The long-term stability of the optical properties is observed, making inorganic lead-free CsEuBr$_3$ NCs promising deep blue emitters for optoelectronics.
