创建分层分子块异质结构,通过对尺寸的控制,形状,光学,和电子特性的每个纳米结构的积木可以帮助开发功能应用,例如信息存储,纳米线光谱法,和光子计算。然而,实现对分子组件位置的精确控制,以及每个块中激子的动力学,仍然是一个挑战。在目前的工作中,我们展示了在每个嵌段中控制激子动力学的分子异质结构的首次制造。此外,这些异质结构是可打印的,可以使用基于直接墨水书写(DIW)的3D打印技术精确定位,导致可编程模式。发射寿命在纳秒或微秒时间尺度上的单重态激子和发射寿命在毫秒时间尺度上的三重态激子同时出现在不同的结构单元中,在异质结中具有有效的能量转移过程。这些有机材料还通过改变激发激光的功率或波长而表现出刺激响应性发射。我们预见了这些有机异质结构在集成光子学中的潜在应用,荧光的多功能性,磷光,高效的能量转移,可印刷性,和刺激敏感性共存于单个纳米线中。本文受版权保护。保留所有权利。
Creating hierarchical molecular block heterostructures, with the control over size, shape, optical, and electronic properties of each nanostructured building block can help develop functional applications, such as information storage, nanowire spectrometry, and photonic computing. However, achieving precise control over the position of molecular assemblies, and the dynamics of excitons in each block, remains a challenge. In the present work, the first fabrication of molecular heterostructures with the control of exciton dynamics in each block, is demonstrated. Additionally, these heterostructures are printable and can be precisely positioned using Direct Ink Writing-based (DIW) 3D printing technique, resulting in programable patterns. Singlet excitons with emission lifetimes on nanosecond or microsecond timescales and triplet excitons with emission lifetimes on millisecond timescales appear simultaneously in different building blocks, with an efficient energy transfer process in the heterojunction. These organic materials also exhibit stimuli-responsive emission by changing the power or wavelength of the excitation laser. Potential applications of these organic heterostructures in integrated photonics, where the versatility of fluorescence, phosphorescence, efficient energy transfer, printability, and stimulus sensitivity co-exist in a single nanowire, are foreseen.