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Ultraviolet, blue and singular green upconversion from Gd2Hf2O7 nanocrystals through dopant manipulation
Solid State Communications ( IF 2.1 ) Pub Date : 2021-08-03 , DOI: 10.1016/j.ssc.2021.114458
Santosh K. Gupta , Mitzy A. Penilla Garcia , Yuanbing Mao

Despite of several advantages of upconversion luminescence (UCL), their full potential is still not completely and commercially harnessed particularly in generating ultraviolet photon and singular visible light. We have taken up this research problem to overcome the global material crisis and tune the color emission in the same materials. Here in this work, we have designed Gd2Hf2O7 nanocrystals (NCs) and co-doped them with Yb3+-Er3+ (GHO-YE) and Yb3+-Tm3+ (GHO-YT) using a molten salt synthesis. Raman spectroscopy data suggest a defect fluorite structure for both GHO-YE and GHO-YT NCs. The GHO-YE NCs display unique UCL phenomenon by converting near infrared (NIR) photon into singular green emission by back transferring host defect and 4F9/2 → 4I15/2 red photon to 4S3/2 → 4I15/2 transition. On the other hand, the GHO-YT NCs show multiple ultraviolet bands and intense blue emission upon NIR irradiation. The UC processes have been further investigated in detail by pump power dependence measurements and confirmed as two-photon absorption process for both samples. This work will not only be boon to the global community working on upconversion phosphors but also highlight the importance of UCL NCs for societal applications towards lighting and imaging technologies.



中文翻译:

通过掺杂剂操作从 Gd2Hf2O7 纳米晶体进行紫外、蓝色和奇异绿色上转换

尽管上转换发光 (UCL) 有几个优点,但它们的全部潜力仍未得到完全和商业利用,特别是在产生紫外光子和奇异可见光方面。我们已着手解决这一研究问题,以克服全球材料危机并调整相同材料的颜色发射。在这项工作中,我们设计了 Gd 2 Hf 2 O 7纳米晶体 (NCs) 并将它们与 Yb 3+ -Er 3+ (GHO-YE) 和 Yb 3+ -Tm 3+共掺杂(GHO-YT) 使用熔盐合成。拉曼光谱数据表明 GHO-YE 和 GHO-YT NCs 都有缺陷萤石结构。GHO-YE NCs 通过将主体缺陷和4 F 9/2  →  4 I 15/2红色光子反向转移到4 S 3/2  →  4 I 15将近红外 (NIR) 光子转换为奇异的绿色发射,从而显示出独特的 UCL 现象/2过渡。另一方面,GHO-YT NCs 在 NIR 照射下显示出多个紫外波段和强烈的蓝色发射。通过泵浦功率依赖性测量进一步详细研究了 UC 过程,并确认为两个样品的双光子吸收过程。这项工作不仅将有益于致力于上转换荧光粉的全球社区,而且还将强调 UCL NC 在照明和成像技术的社会应用中的重要性。

更新日期:2021-08-05
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