Abstract We studied photoluminescence (PL) and electroluminescence (EL) on single aggregates composed of tens to hundreds of nanocrystals (NCs) of the halide perovskite CsPbBr3. Energy landscape of the aggregate caused by size distribution of the NCs leads to funneling of charges towards and EL from the largest NC. This phenomenon results in pronounced blinking of the aggregate EL. In PL, on the other hand, the absorbed light energy is localized and reemitted on individual NCs, without significant redistribution by energy/exciton transfer. As a result the PL of individual aggregates does not show any blinking. We further investigated the effect of externally applied dc voltage on PL of the aggregates in a capacitance-like device and observed an intriguing phenomenon of large oscillations of PL intensity that occur with a period of seconds and are correlated between different aggregates across micrometer distances.

中文翻译：

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CsPBr3钙钛矿纳米晶体聚集体中的能量定位与电荷漏斗

摘要 我们研究了由数十至数百个卤化物钙钛矿 CsPbBr3 纳米晶体 (NC) 组成的单个聚集体的光致发光 (PL) 和电致发光 (EL)。由 NC 的尺寸分布引起的聚集体的能量景观导致电荷从最大的 NC 流向 EL 和 EL。这种现象导致聚集体 EL 明显闪烁。另一方面，在 PL 中，吸收的光能被局部化并重新发射到单个 NC 上，而不会通过能量/激子转移进行显着的重新分配。因此，单个聚合的 PL 没有显示任何闪烁。