Enhancing the Efficiency of HLCT Emitter via External TTA Up-conversion With Exciton Recycling Channel - Tang, Rong; Guo, Haoqing; Gong, Lefan; Yan Chen; Duan, Yiqun; Wang, Shufeng; Chen, Zhijian; Luo, Fei-Xian; Xiao, Lixin (ADVANCED OPTICAL MATERIALS, 2025)