Modulating the Rise and Decay Dynamics of Upconversion Luminescence through Controlling Excitations. Issue 45 (7th October 2022)

• Record Type: Journal Article
• Authors: Han, Yingdong; Gao, Chao; Wei, Tian; Zhang, Kun; Jiang, Zhang; Zhou, Junhe; Xu, Mengjiao; Yin, Lisha; Song, Feng; Huang, Ling
• Is Part Of: Angewandte Chemie international edition. Volume 61:Issue 45(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-07
• Subjects: Excitation Pulse Width -- Lifetime -- Modulation -- Rise and Decay Dynamics -- Upconversion Luminescence; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202212089
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Different from organic dye/quantum dot possessing one luminescent center, upconversion luminescence (UCL) is actually a statistic of temporal behaviors of countless individual activators. Our experimental results have shown that the rise and decay dynamics of UCL is directly associated with the relative contribution of sensitizer‐to‐activator energy transfer and energy migration among sensitizers, which can be physically modulated by simply tuning the excitation laser. Therefore, dynamic UCL with record‐wide 20‐fold lifetime, ≈70‐fold red‐to‐green intensity ratio, and reversibly definable emission color is easily realized by just modulating the excitation laser. Moreover, this generally applicable strategy only requires a simplest‐possible UCL system whereas prevalent material engineering such as complicated composition design, sophisticated core–shell construction, or tedious chemical synthesis, is no longer needed. Abstract : In contrast to the extensively investigated steady‐state upconversion luminescence (UCL), systematic studies on temporal UCL are carried out, which have enabled wide modulation of the rise and decay dynamics of the UCL, and consequently a record adjustment of 20‐fold lifetime, ≈70‐fold red‐to‐green intensity ratio, as well as reversibly definable Er 3+ emission color by simply tuning the pulse width of the excitation laser.