Li Hao, Yu Mengna, He Jiangqiang, Wu Menghan, Li Yang, Luo Manman, Wang Kuande, Li Yan, Zhu Yunfei, Li Qianyi, Han Qiuhu, Wang Shasha, Chen Zhikuan, Feng Quanyou, Xie Linghai
Centre for Molecular Systems and Organic Devices (CMSOD), State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
Key laboratory of Flexible Electronics of Zhejiang Province, Ningbo Institute of Northwestern Polytechnical University, 218 Qingyi Road, Ningbo 315103, China.
J Phys Chem Lett. 2025 Jun 12;16(23):5636-5643. doi: 10.1021/acs.jpclett.5c01157. Epub 2025 May 29.
Toluene and chloroform are widely utilized as solvents in optoelectronic device fabrication, but their carcinogenic properties and potential misuse in illicit drug synthesis subject them to strict state regulation. In contrast, their deuterated counterparts (toluene- and chloroform-) are not recognized as carcinogens by the World Health Organization's International Agency for Research on Cancer (IARC), presenting a safer alternative. Leveraging seawater-derived deuterium's natural abundance, we implemented these deuterated solvents for spin-coating superhindered poly-gridofluorene (PODPFG) emissive layers in solution-processed OLEDs. Comparative studies revealed that films fabricated with deuterated solvents demonstrated a nearly 26% enhancement in PLQY and improved luminescence stability. Notably, the devices showed increased external quantum efficiency from 0.72% to 1.12% while preserving deep blue color purity. These improvements are attributed to the formation of larger and ordered aggregates through enhanced intermolecular interactions in deuterated media, which promote optimal interchain aggregation. Our approach establishes a novel paradigm for isotope engineering in green manufacturing of solution-processed OLEDs, simultaneously addressing toxicity concerns and performance optimization through solvent-mediated morphological control for nontoxic, green manufacturing practices and industrial applications.
甲苯和氯仿在光电器件制造中被广泛用作溶剂，但它们的致癌特性以及在非法药物合成中的潜在滥用使其受到国家的严格监管。相比之下，它们的氘代对应物（氘代甲苯和氘代氯仿）未被世界卫生组织国际癌症研究机构（IARC）认定为致癌物，是一种更安全的替代品。利用海水中氘的天然丰度，我们在溶液处理的有机发光二极管（OLED）中使用这些氘代溶剂旋涂超受阻聚网格芴（PODPFG）发光层。对比研究表明，用氘代溶剂制备的薄膜的光致发光量子产率（PLQY）提高了近26%，发光稳定性也有所改善。值得注意的是，器件的外量子效率从0.72%提高到了1.12%，同时保持了深蓝色的色纯度。这些改进归因于在氘代介质中通过增强分子间相互作用形成了更大且有序的聚集体，从而促进了最佳的链间聚集。我们的方法为溶液处理OLED的绿色制造中的同位素工程建立了一种新范式，通过溶剂介导的形态控制同时解决毒性问题和性能优化，以实现无毒、绿色制造实践和工业应用。
