التفاصيل البيبلوغرافية
| العنوان: |
Proof of crystal-field-perturbation-enhanced luminescence of lanthanide-doped nanocrystals through interstitial H+ doping. |
| المؤلفون: |
Li, Guowei, Jiang, Shihui, Liu, Aijun, Ye, Lixiang, Ke, Jianxi, Liu, Caiping, Chen, Lian, Liu, Yongsheng, Hong, Maochun |
| المصدر: |
Nature Communications; 9/21/2023, Vol. 14 Issue 1, p1-12, 12p |
| مصطلحات موضوعية: |
NANOCRYSTALS, RARE earth metals, LUMINESCENCE, DIAGNOSTIC imaging, RADIATIVE transitions |
| مستخلص: |
Crystal-field perturbation is theoretically the most direct and effective method of achieving highly efficient photoluminescence from trivalent lanthanide (Ln3+) ions through breaking the parity-forbidden nature of their 4f-transitions. However, exerting such crystal-field perturbation remains an arduous task even in well-developed Ln3+-doped luminescent nanocrystals (NCs). Herein, we report crystal-field perturbation through interstitial H+-doping in orthorhombic-phase NaMgF3:Ln3+ NCs and achieve a three-orders-of-magnitude emission amplification without a distinct lattice distortion. Mechanistic studies reveal that the interstitial H+ ions perturb the local charge density distribution, leading to anisotropic polarization of the F− ligand, which affects the highly symmetric Ln3+-substituted [MgF6]4− octahedral clusters. This effectively alleviates the parity-forbidden selective rule to enhance the 4f–4 f radiative transition rate of the Ln3+ emitter and is directly corroborated by the apparent shortening of the radiative recombination lifetime. The interstitially H+-doped NaMgF3:Yb/Er NCs are successfully used as bioimaging agents for real-time vascular imaging. These findings provide concrete evidence for crystal-field perturbation effects and promote the design of Ln3+-doped luminescent NCs with high brightness. Lanthanide-doped inorganic nanocrystals are promising for optical imaging and biomedical applications. Here authors show that interstitial H+ doping-induced crystal-field perturbation enhances the photoluminescence intensity of lanthanide-doped inorganic nanocrystals. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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