The influence of energy migration on luminescence kinetics parameters in upconversion nanoparticles

被引：24

作者：

Alyatkin, Sergey ^{[1
,2
,3
,4
]}

Asharchuk, Ilya ^{[1
]}

Khaydukov, Kirill ^{[1
]}

Nechaev, Andrey

Lebedev, Oleg ^{[5
]}

Vainer, Yuri ^{[2
,3
]}

Semchishen, Vladimir ^{[1
]}

Khaydukov, Evgeny ^{[1
,6
]}

机构：

[1] Russian Acad Sci, Fed Sci Res Ctr Crystallog & Photon, Leninsky Pr 59, Moscow 119333, Russia

[2] Moscow Inst Phys & Technol, Inst Lane 9, Dolgoprudnyi 141700, Moscow Region, Russia

[3] Russian Acad Sci, Inst Spect, Fizicheskaya 5, Moscow 108840, Russia

[4] EUV Labs LLC, Troitsk, Russia

[5] Univ Caen, CNRS ENSIACEN, UMR6508, Lab CRISMAT, F-14050 Caen, France

[6] Sechenov First Moscow State Med Univ, Ctr Bioimaging Inst Regenerat Med, Moscow, Russia

来源：

NANOTECHNOLOGY | 2017年 / 28卷 / 03期

关键词：

upconversion nanoparticles; energy migration; luminescence kinetics; FRET efficiency; VIVO PHOTODYNAMIC THERAPY; UPCONVERTING NANOPARTICLES; NANOPHOSPHOR; DONOR; IONS;

D O I：

10.1088/1361-6528/28/3/035401

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The mechanism of upconversion at the nanoscale is still under discussion. In this paper, we report on the experimental results of anti-Stokes luminescence kinetics in the upconversion nanoparticles of beta-NaYF4: 20% Yb3+; 0.6% Tm3+. The parameters of the luminescence kinetics were found to be unambiguously dependent on the number of excitation quanta n, which are necessary for certain transitions between the energy states of thulium ions. The observed correlation has been explained by means of the long-lasting energy migration between the ytterbium ions. The spread in time between the luminescent maxima of the corresponding thulium transitions not only shows the nonlinear character of upconversion, but also reveals the time scale of energy migration as well. From these, we derive that the conventional Forster formalism applied to the estimation of energy transfer efficiency in UCNP-fluorophore pairs can provide misleading results.

引用

页数：10

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