Electron-phonon coupling properties and energy transfer in NaY(WO4)2:Eu3+ phosphor

2015 ◽  
Vol 647 ◽  
pp. 830-836 ◽  
Author(s):  
Ting Liu ◽  
Qingyu Meng ◽  
Wenjun Sun
Keyword(s):  
Energy Transfer ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Energy transfer rate and electron-phonon coupling properties in Eu3+-doped nanophosphors

Luminescence ◽  
2016 ◽  
Vol 32 (3) ◽  
pp. 425-433 ◽  
Author(s):  
Y. D. Ren ◽  
Y. H. Liu ◽  
S. M. Tan ◽  
H. Y. Cui ◽  
Y. L. Wang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Transfer Rate ◽  
Phonon Coupling ◽  
Energy Transfer Rate ◽  
Electron Phonon Coupling

Energy transfer and electron–phonon coupling properties in Gd2(WO4)3:Eu phosphor

2013 ◽  
Vol 36 (2) ◽  
pp. 384-389 ◽  
Author(s):  
Zhixin Liu ◽  
Qingyu Meng ◽  
Hongliang Liu ◽  
Chengbao Yao ◽  
Qingguo Meng ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

scholarly journals Reconciling Anomalously Fast Heating Rate in Ion Tracks with Low Electron-Phonon Coupling

2021 ◽  
Author(s):  
Nikita Medvedev ◽  
Alexander E. Volkov
Keyword(s):  
Energy Transfer ◽  
Energy Exchange ◽  
Energy Surface ◽  
Heavy Ion ◽  
Phonon Coupling ◽  
Fast Heating ◽  
Ion Tracks ◽  
Swift Heavy Ion ◽  
Electron Phonon Coupling ◽  
Electrons And Ions

Abstract Formation of swift heavy ion tracks requires extremely fast energy transfer between excited electrons and a lattice. However, electron-phonon energy exchange is too slow, as known from laser-irradiation experiments and calculations. We resolve this contradiction noticing that electron-phonon coupling is not the sole mechanism of energy exchange between electrons and ions: heating of electrons also alters potential energy surface of atoms, accelerating them and increasing their kinetic energy.

Observation of Core Phonon in Electron–Phonon Coupling in Au25 Nanoclusters

2021 ◽  
Vol 12 (6) ◽  
pp. 1690-1695
Author(s):  
Zhongyu Liu ◽  
Yingwei Li ◽  
Wonyong Shin ◽  
Rongchao Jin
Keyword(s):  
Phonon Coupling ◽  
Electron Phonon Coupling

scholarly journals Electron-phonon coupling in the magnetic Weyl semimetal ZrCo2Sn

2021 ◽  
Vol 103 (2) ◽  
Author(s):  
I.Yu. Sklyadneva ◽  
R. Heid ◽  
P. M. Echenique ◽  
E. V. Chulkov
Keyword(s):  
Phonon Coupling ◽  
Weyl Semimetal ◽  
Electron Phonon Coupling

scholarly journals Dielectric screening in perovskite photovoltaics

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rui Su ◽  
Zhaojian Xu ◽  
Jiang Wu ◽  
Deying Luo ◽  
Qin Hu ◽  
...  
Keyword(s):  
Open Circuit Voltage ◽  
Low Voltage ◽  
Power Conversion ◽  
Surface Recombination ◽  
Open Circuit ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Dielectric Screening ◽  
Perovskite Photovoltaic ◽  
Reduced Surface

AbstractThe performance of perovskite photovoltaics is fundamentally impeded by the presence of undesirable defects that contribute to non-radiative losses within the devices. Although mitigating these losses has been extensively reported by numerous passivation strategies, a detailed understanding of loss origins within the devices remains elusive. Here, we demonstrate that the defect capturing probability estimated by the capture cross-section is decreased by varying the dielectric response, producing the dielectric screening effect in the perovskite. The resulting perovskites also show reduced surface recombination and a weaker electron-phonon coupling. All of these boost the power conversion efficiency to 22.3% for an inverted perovskite photovoltaic device with a high open-circuit voltage of 1.25 V and a low voltage deficit of 0.37 V (a bandgap ~1.62 eV). Our results provide not only an in-depth understanding of the carrier capture processes in perovskites, but also a promising pathway for realizing highly efficient devices via dielectric regulation.

scholarly journals Structural phase transition and superconductivity hierarchy in 1T-TaS2 under pressure up to 100 GPa

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Qing Dong ◽  
Quanjun Li ◽  
Shujia Li ◽  
Xuhan Shi ◽  
Shifeng Niu ◽  
...  
Keyword(s):  
Structural Phase ◽  
Transition Metal Dichalcogenides ◽  
Phonon Coupling ◽  
Structural Phase Transitions ◽  
Strong Electron ◽  
Electron Phonon Coupling ◽  
Increasing Trend ◽  
Metal Dichalcogenides ◽  
Dome Shape ◽  
Enhanced Superconductivity

AbstractThe adoption of high pressure not only reinforces the comprehension of the structure and exotic electronic states of transition metal dichalcogenides (TMDs) but also promotes the discovery of intriguing phenomena. Here, 1T-TaS2 was investigated up to 100 GPa, and re-enhanced superconductivity was found with structural phase transitions. The discovered I4/mmm TaS2 presents strong electron–phonon coupling, revealing a good superconductivity of the nonlayered structure. The P–T phase diagram shows a dome shape centered at ~20 GPa, which is attributed to the distortion of the 1T structure. Accompanied by the transition to nonlayered structure above 44.5 GPa, the superconducting critical temperature shows an increasing trend and reaches ~7 K at the highest studied pressure, presenting superior superconductivity compared to the original layered structure. It is unexpected that the pressure-induced re-enhanced superconductivity was observed in TMDs, and the transition from a superconductor with complicated electron-pairing mechanism to a phonon-mediated superconductor would expand the field of pressure-modified superconductivity.

Ab Initio Study of the Electron–Phonon Coupling in Ultrathin Al Layers

2021 ◽  
Vol 203 (1-2) ◽  
pp. 180-193
Author(s):  
S. Giaremis ◽  
Ph. Komninou ◽  
Th. Karakostas ◽  
J. Kioseoglou
Keyword(s):  
Ab Initio ◽  
Ab Initio Study ◽  
Phonon Coupling ◽  
Electron Phonon Coupling
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