Self-calibrated optical thermometer LuNbO4:Pr3+/Tb3+ based on intervalence charge transfer transitions

2018 ◽  
Vol 5 (10) ◽  
pp. 2456-2461 ◽  
Author(s):  
Yanfang Wu ◽  
Hao Suo ◽  
Xiaoqi Zhao ◽  
Ziwei Zhou ◽  
Chongfeng Guo
Keyword(s):  
Charge Transfer ◽  
High Sensitivity ◽  
Charge Transfer Transitions ◽  
Intervalence Charge Transfer ◽  
Optical Thermometer

High sensitivity thermometer LuNbO4:Pr3+/Tb3+ based on intervalence charge transfer transitions.

scholarly journals Exploiting exciton coupling of ligand radical intervalence charge transfer transitions to tune NIR absorption

2018 ◽  
Vol 9 (6) ◽  
pp. 1610-1620 ◽  
Author(s):  
Ryan M. Clarke ◽  
Tiffany Jeen ◽  
Serena Rigo ◽  
John R. Thompson ◽  
Loren G. Kaake ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Rational Design ◽  
Near Infrared ◽  
Relative Orientation ◽  
Exciton Coupling ◽  
Salen Complexes ◽  
Nir Absorption ◽  
Charge Transfer Transitions ◽  
Intervalence Charge Transfer

We detail the rational design of a series of bimetallic bis-ligand radical Ni salen complexes in which the relative orientation of the ligand radical chromophores provides a mechanism to tune the energy of intense intervalence charge transfer (IVCT) bands in the near infrared (NIR) region.

A New Mixed Valent Europium Chloride: Na5Eu7Cl22

2002 ◽  
Vol 57 (8) ◽  
pp. 901-907 ◽  
Author(s):  
Claudia Wickleder
Keyword(s):  
Charge Transfer ◽  
Crystal Field ◽  
Lower Energy ◽  
Coordination Polyhedra ◽  
Coordination Numbers ◽  
Charge Transfer Transitions ◽  
Intervalence Charge Transfer ◽  
Unknown Structure ◽  
Europium Chloride ◽  
The Eu

The reaction of NaCl, EuCl2 and EuCl3 yields violet crystals of the new mixed valent chloride Na5Eu7Cl22 which crystallizes with a hitherto unknown structure (orthorhombic, Pmmn, Z = 2, a = 2525.9(4), b=846.91(9), c = 781.72(8) pm). The structure contains four crystallographically different europiumions,which can be attributed toEu2+ or Eu3+ with respect to their coordination numbers and Eu-Cl distances. The [EuClx] coordination polyhedra are connected to chains along the [001] direction. Absorption spectra show transitions which can be assigned either to Eu3+ or Eu2+ ions or to intervalence charge transfer transitions (IVCT). The latter are at lower energy compared to other mixed valent europium chlorides. The occurence of IVCT and the number of the crystal field levels of the Eu3+ ions reveal that the sites of the europium ions are occupied for a small amount by ions of the respective other valence.

Proton-Coupled Intervalence Charge Transfer: Concerted Processes

2012 ◽  
Vol 134 (4) ◽  
pp. 1906-1909 ◽  
Author(s):  
Ramachandran Balasubramanian ◽  
Geneviève Blondin ◽  
Juan Carlos Canales ◽  
Cyrille Costentin ◽  
Jean-Marc Latour ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Intervalence Charge Transfer ◽  
Concerted Processes

Second hyperpolarizability of multimetallocenes [Cp–Mn–Cp] of Be, Mg and Ca

2015 ◽  
Vol 14 (01) ◽  
pp. 1550002 ◽  
Author(s):  
Kaushik Hatua ◽  
Prasanta K. Nandi
Keyword(s):  
Charge Transfer ◽  
Theoretical Study ◽  
Small Variation ◽  
Cooperative Effect ◽  
Second Hyperpolarizability ◽  
Nlo Property ◽  
Metal Atoms ◽  
Bonding Interaction ◽  
Charge Transfer Transitions ◽  
The Difference

Multimetallocene complexes ( Cp – M n– Cp ) of Be , Mg and Ca have been considered for the theoretical study of static second hyperpolarizability using a number of DFT functionals. Owing to the cooperative effect in bonding, beryllium forms multiberyllocene complexes ( Cp – Be n– Cp ) which have sufficient thermal stability with respect to dissociation into neutral fragments up to n = 10. On the other hand, multimetallocene complexes of Mg and Ca are found to be stable for n ≤ 5 which may be due to the weaker covalent bonding interaction between the larger metal atoms. The rather small variation of linear and cubic polarizabilities of Cp – Be n– Cp complexes beyond n = 5 arises from the rather weaker charge transfer transitions. The difference in NLO property among the investigated metal complexes arises from the extent of charge transfer from the terminal metal atoms and the distance between them. The charge transfer at longer distances in the ground state of Mg and Ca complexes leads to more intense electronic transition — the spectroscopic parameters of which strongly favors the enhancement of second hyperpolarizability.

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