A novel strategy for constructing the organic core–shell structures/heterostructures (OCSHs) was developed by the surface doping of a charge transfer (CT) Py-TFP cocrystal (Py = pyrene; TFP = tetrafluoroterephthalonitrile) with the donor (D) or acceptor (A) replacement reaction. The lattice-selective doping of Pe (Pe = perylene) or TCNB (TCNB = 1,2,4,5-tetracyanobenzene) molecules on the Py-TFP surface resulted from both the molecular size match/mismatch and the distribution of the intermolecular hydrogen bonds. Spectroscopic analyses disclosed that the components of two types of lattice-oriented external shells, (Py-TFP)_1–x(Pe-TFP)_x and (Py-TFP)_1–y(Py-TCNB)_y, have the doping ratios of 0 < x ⩽ 2.00% and 0 < y ⩽ 4.03%, respectively. Their di-block core–shell heterostructures display the spatially segregated yellow-blue dual-color emission and the position-dependent optical waveguide with active and passive waveguide modes. Meanwhile, the Pe doped Py-TFP core–shell cocrystal presents (1,0,0) and (0,1,1) lattice-dependent emission and lightwave transmission. This study provides an effective fabrication strategy for the OCSH construction, and this core–shell cocrystallized heterojunction can be available for photonic and optoelectronic functional applications.

中文翻译：

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表面掺杂的有机电荷转移共晶体异质结构及其可变的双色发光和传播

通过电荷转移（CT）Py-TFP共晶体（Py = ;； TFP =四氟对苯二甲腈）与施主（D）或受主的表面掺杂，开发了一种构造有机核-壳结构/异质结构（OCSH）的新策略。 （一）置换反应。Py-TFP表面上的Pe（Pe = ylene）或TCNB（TCNB = 1,2,4,5-四氰基苯）分子的晶格选择性掺杂是由于分子大小匹配/不匹配以及分子间氢的分布引起的债券。光谱分析显示，两种类型的面向晶格的外壳（Py-TFP）₁ - _x（Pe-TFP）_x和（Py-TFP）₁ - _y（Py-TCNB）_y的成分具有掺杂比。的0 < x分别为2.00％和0 < y 4.03％。他们的二嵌段核-壳异质结构显示了空间隔离的黄蓝色双色发射以及具有主动和被动波导模式的位置相关的光波导。同时，掺Pe的Py-TFP核-壳共晶呈现（1,0,0）和（0,1,1）依赖于晶格的发射和光波传输。这项研究为OCSH的构造提供了一种有效的制造策略，并且这种核-壳共晶异质结可用于光子和光电功能应用。