Seung, Hyojin Choi, Changsoon Kim, Dong Chan Kim, Ji Su Kim, Jeong Hyun Kim, Junhee Park, Soo Ik Lim, Jung Ah Yang, Jiwoong Choi, Moon Kee Hyeon, Taeghwan Kim, Dae-Hyeong 2024-01-12T02:36:48Z 2024-01-12T02:36:48Z 2022-10-13 2022-10 2375-2548 https://pubs.kist.re.kr/handle/201004/75998 Synaptic photodetectors exhibit photon-triggered synaptic plasticity, which thus can improve the image recognition rate by enhancing the image contrast. However, still, the visualization and recognition of invisible ultraviolet (UV) patterns are challenging, owing to intense background noise. Here, inspired by all-or-none potentiation of synapse, we develop an integrated device of synaptic phototransistors (SPTrs) and quantum dot light-emitting diodes (QLEDs), facilitating noise reduction and visualization of UV patterns through on-device preprocessing. The SPTrs convert noisy UV inputs into a weighted photocurrent, which is applied to the QLEDs as a voltage input through an external current-voltage？converting circuit. The threshold switching characteristics of the QLEDs result in amplified current and visible illumination by the suprathreshold input voltage or nearly zero current and no visible illumination by the input voltage below the threshold. The preprocessing of image data with the SPTr-QLED can amplify the image contrast, which is helpful for high-accuracy image recognition. English American Association for the Advancement of Science Integration of synaptic phototransistors and quantum dot light-emitting diodes for visualization and recognition of UV patterns Article 10.1126/sciadv.abq3101 1 Science Advances, v.8, no.41 Science Advances 8 41 Y scie scopus 000882137600001 Multidisciplinary Sciences Science & Technology - Other Topics Article PLASTICITY SENSOR ARRAY