Cooperative Enhancement of Two-Photon-Absorption-Induced Photoluminescence from a 2D Perovskite-Microsphere Hybrid Dielectric Structure
Cooperative Enhancement of Two-Photon-Absorption-Induced Photoluminescence from a 2D Perovskite-Microsphere Hybrid Dielectric Structure
复制标题
二维钙钛矿-微球混合介电结构双光子吸收诱导光致发光的协同增强
DOI：
10.1002/adfm.201707550
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发表时间：
2018
影响因子：
19
通讯作者：
Lu Peixiang
中科院分区：
文献类型：
--
作者：
Liu Weiwei;Li Xiaohong;Song Yiling;Zhang Cong;Han Xiaobo;Long Hua;Wang Bing;Wang Kai;Lu Peixiang
纳米结构的双光子吸收诱导光致发光（TPL）通常是低效的，因为它是一个典型的三阶非线性光学过程。本文报道了一种由介电微球（直径约为微米）覆盖在二维钙钛矿薄片上的混合介电结构，这为增强TPL发射提供了一种直接的策略。混合介质结构中的微球不仅能使抽运激光集中，而且能有效提高发射TPL信号的探测效率。在混合介质结构中，由于降低了非辐射速率，二维钙钛矿的内部量子效率也有所提高。这些效应共同使杂化介质结构中的TPL发射增加了两个数量级。此外，混合介电结构被证明可用于在0.05 mW的较低激发功率下进行基于TPL的超分辨率成像。这项工作为开发基于混合介电结构的低成本、高性能非线性纳米器件展示了巨大的前景。
Two‐photon‐absorption‐induced photoluminescence (TPL) from nanostructures is generally inefficient since it is a typical third‐order nonlinear optical process. Herein, a hybrid dielectric structure composed of dielectric microspheres (approximately micrometers in diameter) covering a 2D perovskite flake is reported, which provides a straightforward strategy for enhancing the TPL emission. The microspheres in the hybrid dielectric structure not only concentrate the pumping laser but also effectively increase the detection efficiency of the emitted TPL signal. The internal quantum efficiency of the 2D perovskite is also increased in the hybrid dielectric structure due to a reduced nonradiative rate. These effects cooperatively increase the TPL emission by two orders of magnitude in the hybrid dielectric structure. Moreover, the hybrid dielectric structure is proven to be useful for TPL‐based superresolution imaging at a relatively low excitation power of 0.05 mW. This work demonstrates great promise for developing low‐cost, high‐performance nonlinear nanodevices based on hybrid dielectric structures.