Organic Room‐Temperature Phosphorescent Materials for High‐Performance Floating Gate Photomemory and Synaptic Phototransistor Applications

Room‐temperature phosphorescent (RTP) materials, owing to their long‐lived triplet exciton characteristics, exhibit significant potential for applications in photomemory and artificial photosynapses. However, fluorescent materials are often constrained by nonradiative losses and stability issues, limiting their feasibility for high‐performance applications. To address these challenges, this study employs electron‐deficient RTP materials, 3,3′, 4,4′‐diphenyl sulfone tetracarboxylic dianhydride (DPS), and 3,3′, 4,4′‐benzophenone tetracarboxylic dianhydride (BTDA), combined with the insulating polymer of polystyrene, as the floating gate layer. The memory devices and photosynaptic systems with RTP phenomenon exhibit exceptional photoresponse. The results demonstrate that DPS and BTDA achieve ≈10 5 and 10 6 memory ratios under light‐assisted programming. Furthermore, the BTDA system exhibits superior paired‐pulse facilitation ratios and image recognition accuracy, underscoring its potential in artificial neural network applications. After 100 learning epochs and processing through two denoising arrays ( n = 2), BTDA achieved a significantly improved image recognition accuracy of 88.3%. These findings highlight the high‐efficiency RTP performance of DPS and BTDA and provide a promising avenue for synaptic phototransistors.