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Squaraine Dye-Sensitized Upconversion with Enhanced Stability and Minimized Aggregation-Caused Quenching
Nano Letters ( IF 9.6 ) Pub Date : 2023-05-25 , DOI: 10.1021/acs.nanolett.3c01184 Jialing Hu 1 , Bingjie Zhao 1 , Rongrong Wen 1 , Xuebo Zhang 1 , Yunxiang Zhang 1 , Daniel S Kohane 2 , Qian Liu 1
Nano Letters ( IF 9.6 ) Pub Date : 2023-05-25 , DOI: 10.1021/acs.nanolett.3c01184 Jialing Hu 1 , Bingjie Zhao 1 , Rongrong Wen 1 , Xuebo Zhang 1 , Yunxiang Zhang 1 , Daniel S Kohane 2 , Qian Liu 1
Affiliation
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Upconversion nanoparticles (UCNPs) doped with lanthanides have limited brightness due to their small absorption cross section to light. However, using organic sensitizers can significantly enhance their light absorption ability. Unfortunately, the practical application of organic sensitizers has been hindered by poor stability and aggregation-caused quenching (ACQ). To address these issues, we developed a novel squaraine-based dye, SQ-739, for sensitizing upconversion luminescence (UCL). This dye has a maximum absorption at 739 nm, and shows 1 order of magnitude and 2-fold improved chemical- and photostability, compared to the commonly used cyanine-based dye IR-806, respectively. When SQ-739 is used to sensitize UCNPs, the resulting SQ-739-UCNPs exhibit excellent photostability and reduced ACQ in the presence of polar solvents. Moreover, at the single particle level, the SQ-739-UCNPs exhibit a 97-fold increase in UCL emission compared to bare UCNPs. This squaraine dye-based system represents a new design strategy for developing highly stable and efficient NIR upconversion probes.
中文翻译：
具有增强稳定性和最小化聚集引起的淬灭的方酸染料敏化上转换
掺杂有镧系元素的上转换纳米粒子 (UCNP) 由于其对光的吸收截面较小，因此亮度有限。然而，使用有机增感剂可以显着增强它们的光吸收能力。不幸的是，有机敏化剂的实际应用受到稳定性差和聚集引起的猝灭（ACQ）的阻碍。为了解决这些问题，我们开发了一种新型方酸根染料 SQ-739，用于敏化上转换发光 (UCL)。该染料在 739 nm 处具有最大吸收，与常用的花青基染料 IR-806 相比，化学稳定性和光稳定性分别提高了 1 个数量级和 2 倍。当 SQ-739 用于敏化 UCNPs 时，所得 SQ-739-UCNPs 在极性溶剂存在下表现出优异的光稳定性和降低的 ACQ。而且，在单粒子水平上，与裸 UCNP 相比，SQ-739-UCNP 的 UCL 发射增加了 97 倍。这种基于方酸染料的系统代表了一种用于开发高度稳定和高效的 NIR 上转换探针的新设计策略。
更新日期：2023-05-25
中文翻译：
具有增强稳定性和最小化聚集引起的淬灭的方酸染料敏化上转换
掺杂有镧系元素的上转换纳米粒子 (UCNP) 由于其对光的吸收截面较小，因此亮度有限。然而，使用有机增感剂可以显着增强它们的光吸收能力。不幸的是，有机敏化剂的实际应用受到稳定性差和聚集引起的猝灭（ACQ）的阻碍。为了解决这些问题，我们开发了一种新型方酸根染料 SQ-739，用于敏化上转换发光 (UCL)。该染料在 739 nm 处具有最大吸收，与常用的花青基染料 IR-806 相比，化学稳定性和光稳定性分别提高了 1 个数量级和 2 倍。当 SQ-739 用于敏化 UCNPs 时，所得 SQ-739-UCNPs 在极性溶剂存在下表现出优异的光稳定性和降低的 ACQ。而且，在单粒子水平上，与裸 UCNP 相比，SQ-739-UCNP 的 UCL 发射增加了 97 倍。这种基于方酸染料的系统代表了一种用于开发高度稳定和高效的 NIR 上转换探针的新设计策略。
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