Liang Li Ya, Chen Bin Bin, Wang Yue, Gao Ya Ting, Chang Shuai, Liu Meng Li, Li Da Wei
Key Laboratory for Advanced Materials, Shanghai Key Laboratory of Functional Materials Chemistry, Frontiers Science Center for Materiobiology & Dynamic Chemistry, School of Chemistry & Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China.
Key Laboratory for Advanced Materials, Shanghai Key Laboratory of Functional Materials Chemistry, Frontiers Science Center for Materiobiology & Dynamic Chemistry, School of Chemistry & Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China; School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong, Shenzhen (CUHK-Shenzhen), 2001 Longxiang Boulevard, Longgang District, Shenzhen City, Guangdong 518172, China.
J Colloid Interface Sci. 2023 Nov;649:445-455. doi: 10.1016/j.jcis.2023.06.089. Epub 2023 Jun 18.
Achieving highly efficient and stable room temperature phosphorescence (RTP) with ultralong lifetime is critical for the multi-purpose applications of phosphorescent materials. In this work, we propose an inorganic salt heating recrystallization strategy to simultaneously improve the lifetime, quantum efficiency, and stability of phosphorescent scandium/leucine microspheres (Sc/Leu-MSs). Inorganic salt-treated Sc/Leu-MSs are obtained by simply heating and drying inorganic salt solution containing Sc/Leu-MSs, which can achieve a maximum lifetime increase of 4.42-times from 208.37 ms (Sc/Leu-MSs) to 920.08 ms (Al(SO)-treated Sc/Leu-MSs), accompanied by a RTP intensity increase up to 24.08-times. The enhancement mechanism of RTP efficiency is attributed to the stabilization of triplet excitons caused by inorganic salt coating that suppresses molecular motion and isolates oxygen on the one hand, and the efficient intersystem crossing promoted by aluminized reconstruction-caused duplex heavy atom effects on the other hand. This study provides new design principle and a facile strategy to construct RTP materials with ultralong lifetime, high phosphorescent quantum efficiency, and high stability for promising applications such as anti-counterfeiting and light emitting diodes.
实现具有超长寿命的高效稳定室温磷光（RTP）对于磷光材料的多用途应用至关重要。在这项工作中，我们提出了一种无机盐加热重结晶策略，以同时提高磷光钪/亮氨酸微球（Sc/Leu-MSs）的寿命、量子效率和稳定性。通过简单加热和干燥含有Sc/Leu-MSs的无机盐溶液获得无机盐处理的Sc/Leu-MSs，其最大寿命可从208.37毫秒（Sc/Leu-MSs）提高4.42倍至920.08毫秒（Al(SO)-处理的Sc/Leu-MSs），同时RTP强度提高至24.08倍。RTP效率的增强机制一方面归因于无机盐涂层抑制分子运动并隔离氧气从而稳定三重态激子，另一方面归因于铝化重构引起的双重重原子效应促进了有效的系间窜越。本研究为构建具有超长寿命、高磷光量子效率和高稳定性的RTP材料提供了新的设计原理和简便策略，有望应用于防伪和发光二极管等领域。
