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Enhanced upconversion luminescence intensity of core-shell NaYF4 nanocrystals guided by morphological control

机译：通过形态控制引导的核心壳NayF4纳米晶体的增强的上变发光强度

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摘要

How to further increase the upconversion luminescence (UCL) efficiency of core-shell upconversion nanoparticles (UCNPs) is highly desirable for their photoelectric and bio-logical applications. Herein, a novel but facile strategy is proposed to substantially enhance the UCL intensity of NaYF4 based core-shell UCNPs by morphological control. The morphologies of core-shell UCNPs can be optimized from rod-like to spherical like by changing the ratio of oleic acid (OA) to 1-octadecene (ODE) during the shell growth process with other reaction conditions constant. The mechanism of shape control is further investigated based on the competitive absorption between OA molecules and lanthanide ions (y(3+), Yb3+, Er3+ or Tm3+) onto the different crystal axes (a, b and c) to guide their shell growth speed. The absolute quantum yields were up to 2.7% and 1.8% for spherical and rod like core-shell UCNPs under excitation of 980 nm laser (power density of 1.6 W cm(-2)), respectively. Moreover, the UCL intensity and effective lifetime (tau(eff) ) of Er3+ emission at 541 nm of spherical like core-shell UCNPs increased by 11.7 and 1.82 folds than rod like core-shell UCNPs. Therefore, our designed novel strategy can greatly improve the UCL efficiency of core-shell UCNPs and promote their development in diverse applications.
机译：如何进一步提高核心壳上转化纳米颗粒（UCNP）的上变频（UCL）效率对于它们的光电和生物逻辑应用是非常理想的。这里，提出了一种新颖但容易策略，以通过形态对照基本上提高NayF4基核心壳UCNP的UCL强度。核 - 壳UCNP的形态可以通过在壳生长过程中通过其他反应条件恒定地通过改变油酸（OA）至1-十八烯（ODE）的比例来优化杆状至球形。进一步研究了形状控制的机理，基于OA分子和镧系元素离子（Y（3+），YB3 +，ER3 +或TM3 +或TM3 +）到不同的晶轴（A，B和C）上以引导其壳生长速度的竞争吸收。对于980nm激光（功率密度为1.6W cm（-2））的球形和棒状纤维UCNP，绝对量子产率高达2.7％和1.8％。此外，UCL3 +发射的UCL强度和有效寿命（Tau（eff））在541nm的球形芯 - 壳Ucnps增加到11.7和1.82倍，比芯壳UCNP等棒。因此，我们设计的新颖策略可以大大提高核心壳UCNP的UCL效率，并在各种应用中促进其发展。

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