Sherman Dylan A, Landberg Erik, Peringath Anjana Ramesh, Kar-Narayan Sohini, Tan Jin-Chong
Multifunctional Materials & Composites (MMC) Laboratory, Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, U.K.
Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, U.K.
ACS Appl Mater Interfaces. 2024 Oct 4;16(41):56304-15. doi: 10.1021/acsami.4c10713.
Fabrication of metal-organic framework (MOF) thin films is an ongoing challenge to achieve effective device integration. Inkjet printing has been employed to print various luminescent metal-organic framework (MOF) films. Luminescent metal-organic nanosheets (LMONs), nanometer-thin particles of MOF materials with comparatively large micrometer lateral dimensions, provide an ideal morphology that offers enhancements over analogous MOFs in luminescent properties such as intensity and photoluminescent quantum yield. The morphology is also better suited to the formation of thin films. This work harnesses the preferential features of LMONs to access the advanced technique of aerosol-jet printing (AJP) to print luminescent films with precise geometries and patterns across the micrometer and centimeter length scales. AJP of LMONs exhibiting red (R), green (G), and blue (B) emission were studied systematically to reveal the increase of luminescence upon additive layering printing until a threshold was reached limited by self-quenching. By combining different LMON emitters, emission chromaticity and intensity were shown to be tunable, including the combination of RGB emitters to fabricate white-light-emitting films. A white-light LMON film was printed onto a UV light emitting diode (LED), producing a working white-light-emitting diode. Printing with multiple distinct photoluminescent inks produced intricate multicolor patterns that dynamically responded to excitation wavelength, acting either as micrometer-scale LED-type cells or larger visual tags. Collectively, the work offers an advancement for MOF thin films by printing MON materials using AJP, offering a precise method for manufacturing a wide range of critical functional devices, from luminescent sensors to optoelectronics, and more broadly even the opportunity for printed circuitry with conductive MONs.
制造金属有机框架（MOF）薄膜对于实现有效的器件集成而言仍是一项持续存在的挑战。喷墨打印已被用于打印各种发光金属有机框架（MOF）薄膜。发光金属有机纳米片（LMON）是MOF材料的纳米级薄片，其横向尺寸较大，可达微米级，提供了一种理想的形态，与类似的MOF相比，在发光特性（如强度和光致发光量子产率）方面有所增强。这种形态也更适合形成薄膜。这项工作利用LMON的优势特性，采用气溶胶喷射打印（AJP）这一先进技术，在微米和厘米长度尺度上打印具有精确几何形状和图案的发光薄膜。系统研究了呈现红色（R）、绿色（G）和蓝色（B）发射的LMON的AJP，以揭示在逐层添加打印过程中发光的增加情况，直至达到由自猝灭限制的阈值。通过组合不同的LMON发射体，发射色度和强度被证明是可调的，包括组合RGB发射体来制造发白光的薄膜。将发白光的LMON薄膜打印到紫外发光二极管（LED）上，制成了一个可工作的发白光二极管。使用多种不同的光致发光墨水进行打印可产生复杂的多色图案，这些图案能对激发波长做出动态响应，既可以作为微米级的LED型单元，也可以作为更大的视觉标签。总体而言，这项工作通过使用AJP打印MON材料为MOF薄膜带来了进展，为制造从发光传感器到光电子学等广泛的关键功能器件提供了一种精确方法，甚至更广泛地为使用导电MON的印刷电路提供了机会。
