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Use of Coupled Rate Equations to Mod...

Yao, Ge.

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Use of Coupled Rate Equations to Model NIR-to-Visible Upconversion Kinetics in Er3+, Yb3+: NaYF4 Nanocrystals.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Use of Coupled Rate Equations to Model NIR-to-Visible Upconversion Kinetics in Er3+, Yb3+: NaYF4 Nanocrystals./
Author:	Yao, Ge.
Description:	86 p.
Notes:	Source: Masters Abstracts International, Volume: 52-03.
Contained By:	Masters Abstracts International52-03(E).
Subject:	Chemistry, General. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1547644
ISBN:	9781303497131

Use of Coupled Rate Equations to Model NIR-to-Visible Upconversion Kinetics in Er3+, Yb3+: NaYF4 Nanocrystals.
Yao, Ge.

Use of Coupled Rate Equations to Model NIR-to-Visible Upconversion Kinetics in Er3+, Yb3+: NaYF4 Nanocrystals. - 86 p.

Source: Masters Abstracts International, Volume: 52-03.

Thesis (M.S.)--University of South Dakota, 2013.

The Er3+, Yb3+: NaYF4 system is the most efficient upconversion (UC) phosphor known, and yet the kinetic details of the mechanism responsible for upconversion are poorly understood. In this work, the dynamics of the photo-physical processes leading to NIR-to-visible upconversion luminescence in Er3+, Yb3+: NaYF 4 nanocrystals are investigated using a coupled-rate-equation model. The rate equations used in the simulation contain parameters representing the microscopic rate constants for individual mechanistic steps. Following initial population of the excited Yb3+ 2F5/2 state in the NIR, the population density of the excited states of the Er 3+ and Yb3+ ions are propagated as a function of time. Experimental spectroscopic characterization performed in our research group provides the data with which to study the kinetics of the UC process. The data include the time evolution of green, red, 1.0microm, and 1.5microm emission following pulsed excitation (decay curves), and the relative integrated intensity ratios of green, red, 1.0microm, and 1.5microm emission as a function of excitation power. Simulated and experimental decay curves and intensity ratios are compared to determine the optimum set of parameterized kinetic rate constants. The curve fits and integrated-relative-intensity-ratio fits are optimized using a Nelder-Meade simplex search method, in which the parameters are chosen to minimize the chi2 value calculated from the difference of the simulated and measure intensity ratios and the simulated and measured decay curves. The optimized parameter values obtained from the fits are physically reasonable, which suggests that the rate-equation modeling is an appropriate approach to describe the UC process in Er 3+, Yb3+: NaYF4 nanocrystals.

ISBN: 9781303497131Subjects--Topical Terms:

1021807
Chemistry, General.

Use of Coupled Rate Equations to Model NIR-to-Visible Upconversion Kinetics in Er3+, Yb3+: NaYF4 Nanocrystals.
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100 1 $a Yao, Ge. $3 2096680
245 1 0 $a Use of Coupled Rate Equations to Model NIR-to-Visible Upconversion Kinetics in Er3+, Yb3+: NaYF4 Nanocrystals.
300 $a 86 p.
500 $a Source: Masters Abstracts International, Volume: 52-03.
500 $a Adviser: Paul Stanley May.
502 $a Thesis (M.S.)--University of South Dakota, 2013.
520 $a The Er3+, Yb3+: NaYF4 system is the most efficient upconversion (UC) phosphor known, and yet the kinetic details of the mechanism responsible for upconversion are poorly understood. In this work, the dynamics of the photo-physical processes leading to NIR-to-visible upconversion luminescence in Er3+, Yb3+: NaYF 4 nanocrystals are investigated using a coupled-rate-equation model. The rate equations used in the simulation contain parameters representing the microscopic rate constants for individual mechanistic steps. Following initial population of the excited Yb3+ 2F5/2 state in the NIR, the population density of the excited states of the Er 3+ and Yb3+ ions are propagated as a function of time. Experimental spectroscopic characterization performed in our research group provides the data with which to study the kinetics of the UC process. The data include the time evolution of green, red, 1.0microm, and 1.5microm emission following pulsed excitation (decay curves), and the relative integrated intensity ratios of green, red, 1.0microm, and 1.5microm emission as a function of excitation power. Simulated and experimental decay curves and intensity ratios are compared to determine the optimum set of parameterized kinetic rate constants. The curve fits and integrated-relative-intensity-ratio fits are optimized using a Nelder-Meade simplex search method, in which the parameters are chosen to minimize the chi2 value calculated from the difference of the simulated and measure intensity ratios and the simulated and measured decay curves. The optimized parameter values obtained from the fits are physically reasonable, which suggests that the rate-equation modeling is an appropriate approach to describe the UC process in Er 3+, Yb3+: NaYF4 nanocrystals.
590 $a School code: 0203.
650 4 $a Chemistry, General. $3 1021807
650 4 $a Nanoscience. $3 587832
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710 2 $a University of South Dakota. $b Chemistry. $3 1679392
773 0 $t Masters Abstracts International $g 52-03(E).
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793 $a English
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