The development of artificial visual systems that mimic biological systems requires devices that can autonomously adapt their response to varying stimuli. However, emulating biological feedforward visual adaptation is challenging and requires complementary photoexcitation and inhibition, ideally in a single device. Here we show that an organic transistor that incorporates two bulk heterojunctions is capable of light intensity-dependent active photoadaptation. The approach couples the photovoltaic effect in bulk heterojunctions with electron trapping in the dielectric layer, allowing adaptive modulation of the carrier concentration of the transistor. Our device exhibits active photoadaptation behaviour for light intensities ranging over six orders of magnitude (1 to 10⁶ cd m⁻²). We also define an active adaptation index to describe the luminance-dependent changes to sensitivity, including auto-background control, which for our devices is comparable to that of the human visual system (less than 2 s at 1 × 10⁴ cd m⁻²).

模拟生物系统的人工视觉系统的开发需要能够自主调整其对不同刺激的响应的设备。然而，模拟生物前馈视觉适应具有挑战性，并且需要互补的光激发和抑制，理想情况下在单个设备中。在这里，我们展示了包含两个体异质结的有机晶体管能够进行光强度相关的主动光适应。该方法将体异质结中的光伏效应与电介质层中的电子俘获相结合，允许自适应调制晶体管的载流子浓度。我们的器件在超过六个数量级（1 到 10 ⁶  cd m ^-2）。^{我们还定义了一个主动适应指数来描述与亮度相关的灵敏度变化，包括自动背景控制，对于我们的设备而言，这与人类视觉系统相当（在 1 × 10 4}  cd m ^-2时小于 2 秒））。