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Synthesis of monodisperse hexagonal NaYF4 : Yb, Ln (Ln = Er, Ho and Tm) upconversion nanocrystals in TOPO

机译:TOPO中单分散六角形NaYF4:Yb,Ln(Ln = Er,Ho和Tm)上转换纳米晶体的合成

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摘要

NaYF4 doped with Yb, Ln (Ln = Er, Ho and Tm) upconversion nanocrystals (UP-NCs) were synthesized in trioctylphosphine oxide ( TOPO) solvent via a thermolysis method. It was found that the energy barrier of the phase transition from cubic (alpha) to hexagonal (beta) was significantly reduced in TOPO, and the beta-phase NCs were obtained in a broad temperature window from 330 to 370 degrees C. The as-synthesized NCs had controllable sizes in the range 5-20 nm with narrow size distribution, and presented highly efficient UP fluorescence.
机译:通过热解法在三辛基氧化膦(TOPO)溶剂中合成了掺有Yb,Ln(Ln = Er,Ho和Tm)的NaYF4上转换纳米晶体(UP-NCs)。发现在TOPO中从立方相转变为六方相(β)的能垒显着降低,并且在330至370摄氏度的宽温度范围内获得了β相NC。合成的NC具有5-20 nm范围内的可控制尺寸,尺寸分布窄,并呈现出高效的UP荧光。

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