Simultaneous enhancement of near infrared luminescence and stability of Cs2AgInCl6:Cr3+ double perovskite single crystals enabled by a Yb3+ dopant
Simultaneous enhancement of near infrared luminescence and stability of Cs2AgInCl6:Cr3+ double perovskite single crystals enabled by a Yb3+ dopant
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DOI：
10.1039/d2qi01104b
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发表时间：
2022-07-15
影响因子：
7
通讯作者：
Zhang, Jin Zhong
中科院分区：
文献类型：
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作者：
Chen, Daiwen;Zhang, Xinguo;Zhang, Jin Zhong
宽带近红外（NIR）发射材料对于包括非破坏性生物医学成像的各种应用是令人感兴趣的。采用水热法成功地将Yb~（3+）掺杂到Cs_2AgInCl_6：Cr~（3+）双钙钛矿单晶中。在365 nm激发下，共掺杂的CAIC：Cr 3+，Yb 3 + DPSC显示出范围从800至1400 nm的宽NIR发射，其跨越NIR-I（700 - 900 nm）和NIR-II（1000 - 1700 nm）生物窗口，其中发射带在1000 nm处，半峰全宽（FWHM）为188 nm。结果表明，Yb 3+离子掺杂可以有效地提高CAIC：Cr 3 + DPSC的光致发光性能。与单一掺杂的CAIC：Cr3+的22.5%的光致发光量子产率（PLQY）相比，共掺杂的CAIC：Cr3+，Yb3 + DPSC显示出类似于45%的更高的PLQY，这归因于由于缺陷钝化和结晶度增加而减少的非辐射复合以及自陷激子（STE）到Cr3+的能量转移（ET）的协同效应。作为应用的示范，通过将合成的NIR发射磷光体CAIC：Cr3+，Yb3+与InGaN UV芯片（λ（em）= 365 nm）组合来制造NIR pc-LED，并用于对手掌中的静脉进行成像以及用于使用NIR相机的夜视。结果表明，所合成的CAIC：Cr3+，Yb3 + DPSCs具有良好的生物学应用前景。
Broadband near infrared (NIR) emission materials are of interest for various applications including non-destructive biomedical imaging. In this work, ytterbium ions (Yb3+) were successfully doped into Cs2AgInCl6:Cr3+ (CAIC:Cr3+) double perovskite single crystals (DPSCs) by a facile hydrothermal method. Under 365 nm excitation, the co-doped CAIC:Cr3+,Yb3+ DPSCs showed broad NIR emission ranging from 800 to 1400 nm, which spanned the NIR-I (700-900 nm) and NIR-II (1000-1700 nm) bio-windows, with an emission band at 1000 nm and a full-width at half maximum (FWHM) of 188 nm. It is found that Yb3+ ion doping could effectively improve the photoluminescence (PL) performance of CAIC:Cr3+ DPSCs. Compared to the photoluminescence quantum yield (PLQY) of 22.5% for the single doped CAIC:Cr3+, the co-doped CAIC:Cr3+,Yb3+ DPSCs show a higher PLQY of similar to 45%, which is attributed to the synergistic effect of reduced non-radiative recombination due to defect passivation and increase in crystallinity, and energy transfer (ET) of self-trapped excitons (STEs) to Cr3+. As a demonstration of applications, NIR pc-LEDs were fabricated by combining the as-synthesized NIR-emitting phosphor CAIC:Cr3+,Yb3+ with InGaN UV chips (lambda(em) = 365 nm) and used to image veins in a palm and for night vision using a NIR camera. The results suggest that the synthesized CAIC:Cr3+,Yb3+ DPSCs have great potential in biological applications.