Laboratory of Condensed Matter Spectroscopy and Opto-Electronic Physics, and Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
Nanotechnology. 2017 Feb 24;28(8):085305. doi: 10.1088/1361-6528/aa56db. Epub 2017 Jan 5.
Carbon nanodots (C-dots) have attracted great attention for their biocompatibility and strong tunable photoluminescence (PL). However, aggregation-induced PL quenching blocks their practical application in solid-state optoelectronics. Here, we report a luminescent C-dots freestanding film with a substantially enhanced high quantum yield (QY) of 72.3%. A facile template method, rather than complicate lithography and etching technique is proposed to fabricate the C-dots composite films with large-area (8 inch × 8 inch) ordered micro-scale inverted-pyramid patterns on the surface. The control experiment and theoretical analysis demonstrate the key success to QY enhancement lies in the separation of C-dots and the pattern of surface inverted-pyramid structure. This work realizes the QY enhancement simply by geometrical optics, not the chemical treatment of luminescent particles. It provides a general approach to fabricate large-area freestanding luminescent composite film with high QY.
碳点（C-dots）因其生物相容性和强可调谐光致发光（PL）而受到广泛关注。然而，聚集诱导的 PL 猝灭阻止了它们在固态光电中的实际应用。在这里，我们报告了一种具有高量子产率（QY）72.3%的发光 C 点独立膜。提出了一种简便的模板法，而不是复杂的光刻和刻蚀技术，来制备具有大面积（8 英寸×8 英寸）有序微尺度倒金字塔图案的 C 点复合膜。控制实验和理论分析表明，QY 增强的关键在于 C 点的分离和表面倒金字塔结构的图案。这项工作通过几何光学实现了 QY 的增强，而不是通过发光颗粒的化学处理。它为制备具有高 QY 的大面积独立发光复合膜提供了一种通用方法。
