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.

中文翻译：

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用于低能耗和高质量无创成像的高效有机上转换设备

红外上变频设备（UCD）无需使用读出电路即可实现红外光信号的低成本可视化，这对于生物识别和无创动态监测具有重要意义。然而，UCDs 的光子对光子 (p-p) 效率较差，上转换操作的开启电压 (Von) 较高_，阻碍了高分辨率红外成像的进一步扩展。在此，一种集成了界面激发复合物发射器和精心设计的近红外 (NIR) 检测器的高效有机 UCD 显示出高达 12.92% 的高效率和低至1.56 V 的低 V。低V on_提供了检测_能力低至 3.2 µW cm ^{–2的弱 NIR 光}，显着扩大了UCD的检测能力范围。因此，成像线性动态范围 (I-LDR) 具有高度偏置可调性，范围为 13.23 至 84.4 dB。高 I-LDR 可实现高分辨率和强穿透性的生物成像，特别是对于厚生物切片，表明在无创缺损和病理检测方面具有巨大潜力。