Light‐Programmable Positive‐Negative Photoconductivity Dual‐Mode Photodetection based on Up‐Conversion Nanoparticles/Perovskite Heterostructures. - Wang, Liangyu; Cheng, Zhenpeng; Wang, Tianle; Sun, Bo; Li, Ming‐Yu; Lu, Haifei; Wen, Xiaoyan; Lee, Jihoon; Tong, Xin; Liu, Sisi (Advanced Functional Materials, 2025)