Trinh Cong Tai, Minh Duong Nguyen, Ahn Kwang Jun, Kang Youngjong, Lee Kwang-Geol
Department of Physics, Hanyang University, Seoul, 04763, Republic of Korea.
Department of Chemistry, Research Institute for Natural Sciences, Institute of Nano Science and Technology, Hanyang University, Seoul, 04763, Republic of Korea.
Sci Rep. 2020 Feb 7;10(1):2172. doi: 10.1038/s41598-020-58926-3.
Organic-inorganic halide perovskite nanocrystals or quantum dots (PQDs) are excellent candidates for optoelectronic applications, such as lasers, solar cells, light emitting diodes, and single photon sources. However, the potential applications of PQDs can expand once the photoluminescence, and in particular, the blinking behaviors of single PQDs are understood. Although the blinking of PQDs has been studied extensively recently, the underlying mechanism of the blinking behaviors is still under debate. In this study, we confirmed that type-A and type-B-HC (hot carrier) blinking, contributed to PQD blinking using their fluorescence lifetime intensity distribution (FLID). Type-B-HC blinking was experimentally confirmed for the first time for formamidinium based PQDs, and the simultaneous contributions of type-A and type-B blinking were clearly specified. Further, we related different FLID data to the ON/OFF time distribution as distinct features of different blinking types. We also emphasized that detection capability was crucial for correctly elucidating the blinking mechanism.
有机-无机卤化物钙钛矿纳米晶体或量子点（PQD）是光电子应用的理想候选材料，如激光器、太阳能电池、发光二极管和单光子源。然而，一旦了解了PQD的光致发光，特别是单个PQD的闪烁行为，PQD的潜在应用就可以得到扩展。尽管最近对PQD的闪烁进行了广泛研究，但闪烁行为的潜在机制仍存在争议。在本研究中，我们使用荧光寿命强度分布（FLID）证实了A型和B型-热载流子（HC）闪烁导致了PQD闪烁。首次通过实验证实了基于甲脒的PQD存在B型-HC闪烁，并明确了A型和B型闪烁的同时贡献。此外，我们将不同的FLID数据与开/关时间分布相关联，作为不同闪烁类型的明显特征。我们还强调，检测能力对于正确阐明闪烁机制至关重要。
