宽带近红外光子上转换产生近红外持久发光用于生物成像
Broadband NIR photon upconversion generates NIR persistent luminescence for bioimaging
AI总结：
本文首次发现晶格缺陷介导的宽带近红外光子上转换，在铬掺杂锌镓酸盐纳米颗粒中实现近红外到近红外持久发光，生物成像信背比超200。
摘要：
上转换持久发光（UCPL）荧光粉能够直接被近红外（NIR）光充电，因其在光子学至生物医学领域的广阔应用前景而备受关注。然而，当前基于镧系元素的UCPL荧光粉存在吸收截面小和上转换充电效率低的问题。UCPL荧光粉的开发面临缺乏灵活的上转换充电途径和设计灵活性差的挑战。在此，我们发现了铬掺杂锌镓酸盐纳米颗粒中一种新的晶格缺陷介导的宽带光子上转换过程及其伴随的近红外到近红外UCPL。该锌镓酸盐纳米颗粒可直接被700-1000 nm范围内的宽带近红外光激活，产生约700 nm的持久发光，并且通过合理调控荧光粉中的晶格缺陷可进一步增强该发光。我们提出的UCPL荧光粉通过有效避免自发荧光和光散射的干扰，在生物成像中实现了超过200的信背比。我们的研究首次报道了晶格缺陷介导的光子上转换，显著拓展了面向广泛应用领域的近红外到近红外UCPL荧光粉的灵活设计视野。
英文摘要：
Upconversion persistent luminescence (UCPL) phosphors that can be directly charged by near-infrared (NIR) light have gained considerable attention due to their promising applications ranging from photonics to biomedicine. However, current lanthanide-based UCPL phosphors show small absorption cross-sections and low upconversion charging efficiency. The development of UCPL phosphors faces challenges of lacking flexible upconversion charging pathways and poor design flexibility. Herein, we discovered a new lattice defect-mediated broadband photon upconversion process and the accompanied NIR-to-NIR UCPL in Cr-doped zinc gallate nanoparticles. The zinc gallate nanoparticles can be directly activated by broadband NIR light in the 700-1000 nm range to produce persistent luminescence at about 700 nm, which is also readily enhanced by rationally tailoring the lattice defects in the phosphors. This proposed UCPL phosphors achieved a signal-to-background ratio of over 200 in bioimaging by efficiently avoiding interference from autofluorescence and light scattering. Our findings reported the lattice defect-mediated photon upconversion for the first time, which significantly expanded the horizons for the flexible design of NIR-to-NIR UCPL phosphors toward broad applications.
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