Jiang Z C, Lin T N, Lin H T, Talite M J, Tzeng T T, Hsu C L, Chiu K P, Lin C A J, Shen J L, Yuan C T
Department of Physics, Chung Yuan Christian University, Chung Li, 320, Taiwan.
Department of Biomedical Engineering, Chung Yuan Christian University, Chung Li, 320, Taiwan.
Sci Rep. 2016 Jan 29;6:19991. doi: 10.1038/srep19991.
Solution-processed, non-toxic carbon dots (CDs) have attracted much attention due to their unique photoluminescence (PL) properties. They are promising emissive layers for flexible light-emitting devices. To this end, the CDs in pristine aqueous solutions need to be transferred to form solid-state thin films without sacrificing their original PL characteristics. Unfortunately, solid-state PL quenching induced by extra non-radiative (NR) energy transfer among CDs would significantly hinder their practical applications in optoelectronics. Here, a facile, low-cost and effective method has been utilized to fabricate high-performance CD/polymer light-emitting flexible films with submicron-structured patterns. The patterned polymers can serve as a solid matrix to disperse and passivate CDs, thus achieving high internal quantum yields of 61%. In addition, they can act as an out-coupler to mitigate the waveguide-mode losses, approximately doubling the external light-extraction efficiency. Such CD/polymer composites also exhibit good photo-stability, and thus can be used as eco-friendly, low-cost phosphors for solid-state lighting.
溶液法制备的无毒碳点（CDs）因其独特的光致发光（PL）特性而备受关注。它们是用于柔性发光器件的有前途的发光层。为此，需要将原始水溶液中的碳点转移以形成固态薄膜，同时不牺牲其原始的PL特性。不幸的是，碳点之间额外的非辐射（NR）能量转移引起的固态PL猝灭会严重阻碍它们在光电子学中的实际应用。在此，已采用一种简便、低成本且有效的方法来制备具有亚微米结构图案的高性能CD/聚合物发光柔性薄膜。图案化的聚合物可以作为固体基质来分散和钝化碳点，从而实现61%的高内部量子产率。此外，它们可以作为外耦合器来减轻波导模式损耗，使外部光提取效率提高约一倍。这种CD/聚合物复合材料还表现出良好的光稳定性，因此可以用作固态照明的环保、低成本磷光体。
