光致发光
材料科学
纳米颗粒
量子产额
发光
六角相
粒径
相(物质)
猝灭(荧光)
量子点
纳米晶
纳米技术
分析化学(期刊)
光学
光电子学
物理化学
化学
物理
荧光
有机化学
色谱法
作者
Marta Quintanilla,Eva Hemmer,José Marqués-Hueso,Shadi Rohani,Giacomo Lucchini,Miao Wang,Reza Zamani,Vladimir Roddatis,Adolfo Speghini,Bryce S. Richards,Fiorenzo Vetrone
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2022-01-01
卷期号:14 (4): 1492-1504
被引量:21
摘要
Upconverting nanoparticles (UCNPs) are well-known for their capacity to convert near-infrared light into UV/visible light, benefitting various applications where light triggering is required. At the nanoscale, loss of luminescence intensity is observed and thus, a decrease in photoluminescence quantum yield (PLQY), usually ascribed to surface quenching. We evaluate this by measuring the PLQY of NaGdF4:Er3+,Yb3+ UCNPs as a function of size (ca. 15 to 100 nm) and shape (spheres, cubes, hexagons). Our results show that the PLQY of α-phase NaGdF4 Er3+,Yb3+ surpasses that of β-NaGdF4 for sizes below 20 nm, an observation related to distortion of the crystal lattice when the UCNPs become smaller. The present study also underlines that particle shape must not be neglected as a relevant parameter for PLQY. In fact, based on a mathematical nucleus/hull volumetric model, shape was found to be particularly relevant in the 20 to 60 nm size range of the investigated UCNPs.
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