Efficient Organic Upconversion Devices for Low Energy Consumption and High‐Quality Noninvasive Imaging
Xiaoyang Du, Jiayue Han, Zeyu He, Chao Han, Xiaomu Wang, Jun Wang, Yadong Jiang, Silu Tao
Abstract
Abstract Infrared upconversion devices (UCDs) enable low‐cost visualization of infrared optical signals without utilizing a readout circuit, which is of great significance for biological recognition and noninvasive dynamic monitoring. However, UCDs suffer from inferior photon to photon (p–p) efficiency and high turn‐on voltage ( V on ) for upconversion operation, hindering a further expansion in highly resolved infrared imaging. Herein, an efficient organic UCD integrating an interfacial exciplex emitter and a well‐designed near‐infrared (NIR) detector reveals a high efficiency up to 12.92% and a low V on down to 1.56 V. The low V on gives the capacity for detecting weak NIR light down to 3.2 µW cm –2 , significantly expanding the detection power scale of UCDs. Thus, the imaging linear dynamic range (I‐LDR) is highly bias‐tunable, ranging from 13.23 to 84.4 dB. The high I‐LDR enables highly resolved and strong‐penetration bioimaging especially for thick biological sections, indicating great potential in noninvasive defect and pathological detection.