Fast Crystallization-Deposition of Orderly Molecule Level Heterojunction Thin Films Showing Tunable Up-Conversion and Ultrahigh Photoelectric Response.,ACS Central Science

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Fast Crystallization-Deposition of Orderly Molecule Level Heterojunction Thin Films Showing Tunable Up-Conversion and Ultrahigh Photoelectric Response.
ACS Central Science ( IF 12.7 ) Pub Date : 2020-06-24 , DOI: 10.1021/acscentsci.0c00447
Xiao-Gang Yang _{1,

2} , Zhi-Min Zhai ₁ , Xiao-Min Lu ₁ , Lu-Fang Ma ₁ , Dongpeng Yan ₂

Affiliation

Molecular cocrystals have received much attention for tuning physicochemical properties in pharmaceutics, luminescence, organic electronics, and so on. However, the effective methods for the formation of orderly cocrystal thin films are still rather limited, which have largely restricted their photofunctional and optoelectronic applications. In this work, a fast crystallization-deposition procedure is put forward to obtain acridine (AD)-based cocrystals, which are self-assembled with three typical isophthalic acid derivatives (IPA, IPB, and TMA). The obtained donor–acceptor cocrystal complexes exhibit an adjustable energy level, wide range of photoluminescence color, and rotational angle-dependent polarized emission. The orderly and uniform cocrystal thin films further present tunable one-/two-photon up-conversion and different semiconductor properties. Particularly, AD-TMA cocrystal thin film shows a rare example of a molecule level heterojunction with the alternating arrangement of AD electronic acceptor layers and TMA electronic donor layers, and thus, provides a way for efficient mobility and separation of electron–hole pairs. A large on–off photocurrent ratio of more than 10⁴ can be achieved for the AD-TMA thin film, which is higher than state-of-the-art molecular semiconductor systems. Therefore, this work extends the application scopes of orderly cocrystal thin film materials for future luminescent and optoelectronic micro-/nanodevices.

中文翻译：

有序分子级异质结薄膜的快速结晶沉积显示出可调谐上转换和超高光电响应。

分子共晶在制药、发光、有机电子学等领域因调节物理化学性质而受到广泛关注。然而，形成有序共晶薄膜的有效方法仍然相当有限，这在很大程度上限制了其光功能和光电应用。在这项工作中，提出了一种快速结晶-沉积程序以获得基于吖啶（AD）的共晶，该共晶是与三种典型的间苯二甲酸衍生物（IPA、IPB和TMA）自组装的。获得的供体-受体共晶复合物表现出可调节的能级、宽范围的光致发光颜色和旋转角度依赖性偏振发射。有序且均匀的共晶薄膜进一步呈现出可调谐的一/双光子上转换和不同的半导体特性。特别是，AD-TMA共晶薄膜展示了AD电子受体层和TMA电子供体层交替排列的分子级异质结的罕见例子，从而为电子-空穴对的有效迁移和分离提供了一种途径。 AD-TMA薄膜可以实现超过10 ⁴的大开关光电流比，高于最先进的分子半导体系统。因此，这项工作拓展了有序共晶薄膜材料在未来发光和光电微纳米器件中的应用范围。

更新日期：2020-07-22

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