scholarly journals Thermally deactivated energy transfer in Bi3+−Yb3+ codoped Y2O3 : Evidence for the exchange interaction mechanism

2018 ◽  
Vol 98 (13) ◽  
Author(s):  
Ting Yu ◽  
Dechao Yu ◽  
Qinyuan Zhang ◽  
Andries Meijerink
Keyword(s):  
Energy Transfer ◽  
Exchange Interaction ◽  
Interaction Mechanism

scholarly journals Revealing the contest between triplet-triplet exchange and triplet-triplet energy transfer coupling in correlated triplet pair states in singlet fission

2021 ◽  
Author(s):  
Vibin Abraham ◽  
Nicholas Mayhall
Keyword(s):  
Energy Transfer ◽  
Exchange Interaction ◽  
Entangled State ◽  
Separation Mechanism ◽  
Singlet Fission ◽  
Triplet Energy ◽  
Triplet Pair ◽  
Triplet Energy Transfer ◽  
State 1 ◽  
Pair State

Understanding the separation of the correlated triplet pair state 1(TT) intermediate is critical for leveraging singlet fission to improve solar cell efficiency. This separation mechanism is dominated by two key interactions: (i) the exchange interaction (K) between the triplets which leads to the spin splitting of the biexciton state into 1(TT),3(TT) and 5(TT) states, and (ii) the triplet-triplet energy transfer integral (t) which enables the formation of the spatially separated (but still spin entangled) state 1(T...T). We develop a simple ab initio technique to compute both the biexciton exchange (K) and biexciton transfer coupling. Our key findings reveal new conditions for successful correlated triplet pair state dissociation. The biexciton exchange interaction needs to be ferromagnetic or negligible to the triplet energy transfer for favourable dissociation. We also explore the effect of chromophore packing to reveal geometries where these conditions are achieved for tetracene.

The Size Confinement Effect for Eu3+ Concentration Quenching and Energy Transfer in YVO4 Nanocrystal

2016 ◽  
Vol 16 (4) ◽  
pp. 3772-3776 ◽  
Author(s):  
Qingyu Meng ◽  
Jiaqi Dai ◽  
Wenjun Sun ◽  
Changwen Wang
Keyword(s):  
Energy Transfer ◽  
Exchange Interaction ◽  
Electric Dipole ◽  
Dipole Interaction ◽  
Concentration Quenching ◽  
Confinement Effect ◽  
Precipitation Method ◽  
Range Interaction ◽  
Operating Range ◽  
Size Confinement

YVO4:Eu3+ nanocrystal powders (∼30 nm) with different doping concentrations were prepared using a precipitation method. Bulky powders (∼500 nm) were obtained by annealing the nanopowders at high temperature. The concentration quenching of luminescent centers and energy transfer in YVO4: Eu3+ powders were investigated. It was found that quenching concentration for Eu3+ 5D0→7F2 transition emission in nanopowders is distinctly higher than that in bulk powders. The type of energy transfer that caused concentration quenching was identified to be electric dipole–dipole interaction in bulk powders and exchange interaction in nanopowders. The electric dipole–dipole interaction is a long-range interaction (operating range of several nanometers). The size confinement effect of boundary in nanoparticles has obvious inhibitory effect on electric dipole–dipole interaction, and hardly affect the exchange interaction which is a short-range interaction (operating range several angstroms). The electric dipole–dipole interaction is restrained by particle boundary in nanopowders. So energy transfer of Eu3+ ions in nanomaterials is dominated by exchange interaction, and quenching concentration of nanomaterials is higher than in bulky materials.

scholarly journals Luminescence quenching of Sm3+ ions in alkali borotellurite glasses

2016 ◽  
Vol 26 (2) ◽  
pp. 193
Author(s):  
Vu Phi Tuyen ◽  
Phan Van Do
Keyword(s):  
Energy Transfer ◽  
Transfer Process ◽  
Luminescence Intensity ◽  
Energy Transfer Process ◽  
Interaction Mechanism ◽  
Cross Relaxation ◽  
Luminescence Quenching ◽  
Quenching Of Luminescence

The dependence of luminescence intensity on  Sm\(^{3 + }\) ions concentration in alkali borotellurite (ABTe) glasses has  been studied. The quenching of luminescence intensity happens  around 0.75 mol% concentration of Sm\(^{3 + }\) ions and it can relate the  energy transfer process through cross--relaxation (CR), the CR channels in  ABTe: Sm\(^{3 + }\) have been shown. The method of Van Uitert was used to find  the dominant interaction mechanism for energy transfer process. 

Interaction mechanism for energy transfer from Ce to Tb ions in silica

2016 ◽  
Vol 480 ◽  
pp. 100-104 ◽  
Author(s):  
H.A.A. Seed Ahmed ◽  
W.S. Chae ◽  
O.M. Ntwaeaborwa ◽  
R.E. Kroon
Keyword(s):  
Energy Transfer ◽  
Interaction Mechanism
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