A modified energy transfer model for determination of upconversion emission of β-NaYF 4 :Yb,Er: Role of self-quenching effect

2017 ◽  
Vol 185 ◽  
pp. 292-297 ◽  
Author(s):  
Hongyuan Zhu ◽  
Min Lin ◽  
Guorui Jin ◽  
Tian Jian Lu ◽  
Feng Xu
Keyword(s):  
Energy Transfer ◽  
Upconversion Emission ◽  
Transfer Model ◽  
Quenching Effect ◽  
Energy Transfer Model

scholarly journals Study on Positron Annihilation Rate in Water

2008 ◽  
Vol 14 (2) ◽  
pp. 126-128
Author(s):  
Tran Dai Nghiep
Keyword(s):  
Energy Transfer ◽  
Positron Annihilation ◽  
Hpge Detector ◽  
Transfer Model ◽  
Annihilation Rate ◽  
Rate Measurement ◽  
Positron Source ◽  
Multichannel Analyser ◽  
Energy Transfer Model

Measurement system for determination of positron annihilation rate is consisted of HPGe detector, multichannel analyser and Na$^{22}$ positron source. The result of annihilation rate measurement in wetted filter paper is treated. The formula of energy transfer model is used for explanation obtained data quantitatively.

scholarly journals Dynamics of the Green and Red Upconversion Emissions inYb3+-Er3+-CodopedY2O3Nanorods

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
O. Meza ◽  
L. A. Diaz-Torres ◽  
P. Salas ◽  
C. Angeles-Chavez ◽  
A. Martínez ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excellent Agreement ◽  
Upconversion Emission ◽  
Nonradiative Energy Transfer ◽  
Transfer Model ◽  
Solvent Ratio ◽  
Upconversion Emissions ◽  
Transfer Mechanisms ◽  
Energy Transfer Model ◽  
Experimental Decay

Efficient green and red upconversion emission inY2O3:Yb3+,Er3+nanorods under 978 nm radiation excitation is achieved. Experimental effective lifetimes, luminescent emissions, and nanorod sizes depend strongly on the solvent ratios used during the synthesis. A microscopic nonradiative energy transfer model is used to approach the dynamics of the green, red, and infrared emissions. The excellent agreement between simulated and experimental decay suggests that the energy transfer mechanisms responsible of the visible emission depend on the solvent ratio.

Cooperative Pair Driven Quenching of Yb3+ Emission in Nanocrystalline ZrO2:Yb3+

2009 ◽  
Vol 5 ◽  
pp. 121-134 ◽  
Author(s):  
O. Meza ◽  
L.A. Diaz-Torres ◽  
P. Salas ◽  
E. De la Rosa ◽  
C. Ángeles-Chávez ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Crystalline Phase ◽  
Luminescence Quenching ◽  
Interaction Parameters ◽  
Transfer Model ◽  
Geometrical Construction ◽  
Transfer Processes ◽  
Nir Emission ◽  
Energy Transfer Model ◽  
Cooperative Energy

The concentration luminescence quenching of the NIR emission of Yb3+ in nanocrystalline ZrO2 is studied. It is found that the quenching is dominated by cooperative energy transfer processes from isolated Yb3+ ions to Yb-Yb pairs (Yb dimers). The Yb dimer concentration depends on the crystallite phase and size, which on time depends on Yb concentration. An extended energy transfer model was developed to predict the IR and cooperative visible fluorescence emissions by taking in to account the crystalline phase, the nanocrystals size, and the geometrical construction of Yb dimers. Our model succeeds to fit simultaneously both experimental VIS and NIR emissions, and the corresponding interaction parameters are reported.

scholarly journals Supporting Students in Using Energy Ideas to Interpret Phenomena: The Role of an Energy Representation

2019 ◽  
Vol 18 (8) ◽  
pp. 1635-1654
Author(s):  
Marcus Kubsch ◽  
Jeffrey Nordine ◽  
David Fortus ◽  
Joseph Krajcik ◽  
Knut Neumann
Keyword(s):  
Energy Transfer ◽  
Qualitative Content Analysis ◽  
Transfer Model ◽  
School Students ◽  
Making Sense ◽  
8Th Grade ◽  
Quasi Experimental ◽  
Important Idea ◽  
Support Students

AbstractIn the sciences, energy is an important idea to get insight into phenomena, as energy can help to reveal hidden systems and processes. However, students commonly struggle to use energy ideas to interpret and explain phenomena. To support students in using energy ideas to interpret and explain phenomena, a range of different graphical representations are commonly used. However, there is little empirical research regarding whether and how these representations actually support students’ ability to use energy ideas. Building on common ways of representing energy transfer, we address this issue by exploring whether, and if so how, a specific representation called the energy transfer model (ETM) supports middle school students’ interpretation of phenomena using the idea of energy transfer. We conducted an interview study with N = 30 8th grade students in a quasi-experimental setting and used qualitative content analysis to investigate student answers. We found evidence that students who construct an ETM when making sense of phenomena consider the role of energy transfers between systems more comprehensively, i.e., they reason about hidden processes and systems to a larger extent than students who do not construct an ETM.

The Research on Loading Effect of Energy Transfer Model-Based QCM Immunosensor

2013 ◽  
Vol 401-403 ◽  
pp. 1149-1152
Author(s):  
Yan Chen ◽  
Xian He Huang
Keyword(s):  
Energy Transfer ◽  
Theoretical Basis ◽  
Quartz Crystal ◽  
Functional Relationship ◽  
Maximum Amplitude ◽  
Quartz Resonator ◽  
Transfer Model ◽  
Mass Loading ◽  
Absolute Viscosity ◽  
Energy Transfer Model

To improve the accuracy of quartz crystal microbalance (QCM) immunosensor, it is the key to distinguish accurately and effectively about the effects of mass loading and damping loading of a quartz resonator vibrating in damping environment. The energy transfer model (ETM) is introduced to deduce functional relationship between the product of absolute viscosity and density of the liquid deposit and the maximum amplitude of vibration at the quartz-resonator surface. Then the effect of mass loading can be rapidly distinguished from damping loading by measuring the frequency shift and the amplitude of QCM. This method provides a new theoretical basis for the application of QCM immunosensor in medical diagnosis, especially in tumor diagnosis.

Sign in / Sign up

Export Citation Format

Share Document