Gogoi Kasturi, Chattopadhyay Arun
Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.
Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.
Langmuir. 2022 Mar 1;38(8):2668-2676. doi: 10.1021/acs.langmuir.1c03402. Epub 2022 Feb 15.
We demonstrate fabrication of photodetectors in the UVC and UVA regions, based on surface engineering of Mn-doped ZnS Qdot. Mn-doped ZnS Qdot exhibited UVC detection with a responsivity of 0.3 ± 0.02 A·W and detectivity of 1.7 ± 0.2 10 Jones. Following this, the Qdot was surface modified with 8-hydroxyquinoline 5-sulfonic acid ligand, which resulted in the formation of a bluish green zinc quinolate complex (Zn(QS)) at the Qdot surface (defined as the quantum dot complex, QDC) exhibiting overall white photoluminescence. The detector developed with QDC as the photoactive material exhibited a responsivity of 0.2 ± 0.02 A·W and detectivity of 1.2 ± 0.2 10 Jones in the UVA band. This shift in the detection band from UVC in Qdot to UVA in QDC, through the surface complexation mechanism, is a new approach for tuning spectral detection featured in this work. Besides, the self-powered response of both the detectors exhibited attractive photoelectric characteristics. The detectors were incorporated in a portable prototype to show their potential application toward selective UVC and UVA spectral detection. Additionally, the dual-mode emission of the QDC was used for data encryption and decryption.
我们展示了基于锰掺杂硫化锌量子点的表面工程，在紫外线C（UVC）和紫外线A（UVA）区域制造光电探测器。锰掺杂硫化锌量子点表现出UVC探测能力，其响应度为0.3±0.02 A·W，探测率为1.7±0.2×10琼斯。在此之后，量子点用8-羟基喹啉-5-磺酸配体进行表面修饰，这导致在量子点表面形成蓝绿色喹啉酸锌络合物（Zn(QS)）（定义为量子点络合物，QDC），呈现出整体白色光致发光。以QDC作为光活性材料开发的探测器在UVA波段的响应度为0.2±0.02 A·W，探测率为1.2±0.2×10琼斯。通过表面络合机制，探测波段从量子点中的UVC转移到QDC中的UVA，这是本文中用于调谐光谱探测的一种新方法。此外，两种探测器的自供电响应都表现出吸引人的光电特性。这些探测器被集成到一个便携式原型中，以展示它们在选择性UVC和UVA光谱探测方面的潜在应用。此外，QDC的双模发射被用于数据加密和解密。
