Li Ting-You, Xu Xuezhu, Lin Chun-Ho, Guan Xinwei, Hsu Wei-Hao, Tsai Meng-Lin, Fang Xiaosheng, Wu Tom, He Jr-Hau
Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia.
School of Materials Science and Engineering University of New South Wales (UNSW) Sydney NSW 2052 Australia.
Adv Sci (Weinh). 2020 Jul 24;7(17):1902439. doi: 10.1002/advs.201902439. eCollection 2020 Sep.
Halide perovskite quantum dots (PQDs) are promising materials for diverse applications including displays, light-emitting diodes, and solar cells due to their intriguing properties such as tunable bandgap, high photoluminescence quantum yield, high absorbance, and narrow emission peaks. Despite the prosperous achievements over the past several years, PQDs face severe challenges in terms of stability under different circumstances. Currently, researchers have overcome part of the stability problem, making PQDs sustainable in water, oxygen, and polar solvents for long-term use. However, halide PQDs are easily degraded under continuous irradiation, which significantly limits their potential for conventional applications. In this study, an oleic acid/oleylamine (traditional surface ligands)-free method to fabricate perovskite quantum dot papers (PQDP) is developed by adding cellulose nanocrystals as long-chain binding ligands that stabilize the PQD structure. As a result, the relative photoluminescence intensity of PQDP remains over ≈90% under continuous ultraviolet (UV, 16 W) irradiation for 2 months, showing negligible photodegradation. This proposed method paves the way for the fabrication of ultrastable PQDs and the future development of related applications.
卤化物钙钛矿量子点（PQDs）因其具有诸如可调节带隙、高光致发光量子产率、高吸光度和窄发射峰等引人关注的特性，是用于包括显示器、发光二极管和太阳能电池在内的多种应用的有前景的材料。尽管在过去几年取得了丰硕成果，但PQDs在不同环境下的稳定性方面面临严峻挑战。目前，研究人员已经克服了部分稳定性问题，使PQDs能够在水、氧气和极性溶剂中长期可持续使用。然而，卤化物PQDs在持续照射下容易降解，这极大地限制了它们在传统应用中的潜力。在本研究中，通过添加纤维素纳米晶体作为稳定PQD结构的长链结合配体，开发了一种无油酸/油胺（传统表面配体）的方法来制备钙钛矿量子点纸（PQDP）。结果，PQDP在连续紫外光（UV，16 W）照射2个月的情况下，其相对光致发光强度保持在约90%以上，光降解可忽略不计。该方法为制备超稳定PQDs及相关应用的未来发展铺平了道路。
