Solution-processed diarylfluorene derivatives for violet-blue amplified spontaneous emission and electroluminescenceElectronic supplementary information (ESI) available. See DOI: 10.1039/c7tc03536e

• Main Authors: Han, Ya-Min, Bai, Lu-Bing, Yin, Cheng-Rong, Ou, Chang-Jin, Zhang, Xin-Wen, Zuo, Zong-Yan, Liu, Bin, Yu, Meng-Na, Lin, Jin-Yi, Zhao, Jian-Feng, Zhu, Wen-Sai, Liu, Yu-Yu, Li, Jie-Wei, Wang, Jian-Pu, Xie, Ling-Hai, Huang, Wei
• Format: Journal Article
• Language: English
• Published: 05.10.2017
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/c7tc03536e

A series of solution-processable diarylfluorene-based materials with pendent 4-(hexyloxy carbazole)-9,9-diphenyl-9 H -fluorene (MC 6 Cz) or 4-(octyloxy)-9,9-diphenyl-9 H -fluorene (MC 8 ) as the core and endcapped with different charge transport moieties such as phenylcarbazole (NPC) or triphenylemine (TPA) have been synthesized and investigated systemically. These materials exhibited bright fluorescence emission from violet-blue to deep blue without molecular aggregation in diluted solutions and films. Furthermore, these materials also displayed prominent virtues including superior solution-processability and amorphous characteristics. Consequently, the EL spectra of the solution-processed organic light-emitting diodes (OLEDs) are expected to be similar to the corresponding PL spectra, suggesting intramolecular photophysical behavior. MC 6 Cz-9-NPC as an emitting layer presented the highest maximum luminance of about 1560 cd m −2 with a lower turn on voltage of 3.5 V. In contrast, the ASE results revealed that the MC 8 core-containing compounds exhibited relatively lower thresholds comparable with traditional conjugated or star type polymers, which could be promising optical gain media. We proposed a novel molecular design strategy to construct high-performance solution-processed violet-blue fluorophores. A series of solution-processable 4-subsituted diarylfluorene small molecules for violet-blue amplified spontaneous emission and electroluminescence.