Organic Laser Molecule with High Mobility, High Photoluminescence Quantum Yield, and Deep-Blue Lasing Characteristics
Dan Liu, Jianbo De, Haikuo Gao, Suqian Ma, Qi Ou, Shuai Li, Zhengsheng Qin, Huanli Dong, Qing Liao, Bin Xu, Qian Peng, Zhigang Shuai, Wenjing Tian, Hongbing Fu, Xiaotao Zhang, Yonggang Zhen, Wenping Hu
Abstract
Here, we design and synthesize an organic laser molecule, 2,7-diphenyl-9H-fluorene (LD-1), which has state-of-the-art integrated optoelectronic properties with a high mobility of 0.25 cm2 V–1 s–1, a high photoluminescence quantum yield of 60.3%, and superior deep-blue laser characteristics (low threshold of Pth = 71 μJ cm–2 and Pth = 53 μJ cm–2 and high quality factor (Q) of ∼3100 and ∼2700 at emission peaks of 390 and 410 nm, respectively). Organic light-emitting transistors based on LD-1 are for the first time demonstrated with obvious electroluminescent emission and gate tunable features. This work opens the door for a new class of organic semiconductor laser molecules and is critical for deep-blue optical and laser applications.