scholarly journals Coherence effect of high excited state atoms

2012 ◽  
Vol 61 (19) ◽  
pp. 193302
Author(s):  
Zhao Jian-Dong ◽  
Xin Jie
Keyword(s):  
Excited State ◽  
High Excited State ◽  
Coherence Effect

White upconversion emission in Yb3+/Tm3+/Ho3+ doped SrMoO4 nanocrystals by high excited state energy transfer

2013 ◽  
Vol 550 ◽  
pp. 509-513 ◽  
Author(s):  
Dongyu Li ◽  
Yuxiao Wang ◽  
Xueru Zhang ◽  
Guang Shi ◽  
Gang Liu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
State Energy ◽  
Upconversion Emission ◽  
High Excited State ◽  
Excited State Energy

Nonlinear Optical and Transport Properties of Fullerene Crystals

1994 ◽  
Vol 359 ◽  
Author(s):  
Hugh J. Byrne ◽  
Lidia Akselrod ◽  
Andreas T. Werner ◽  
Wolfgang K. Maser ◽  
Mathias Kaiser ◽  
...  
Keyword(s):  
Phase Transition ◽  
Excited State ◽  
Nonlinear Dependence ◽  
High Excited State ◽  
Time Resolved ◽  
Highly Nonlinear ◽  
Observed Behaviour ◽  
State Densities ◽  
Photochemical Modification ◽  
Time Resolved Photoluminescence

ABSTRACTPicosecond time resolved photoluminescence and photoconductivity measurements are performed to investigate the influence of high intensity illumination on the properties of Fullerene crystals. A highly nonlinear dependence of both the photoluminescence characteristics and the photoconductive response of the fullerenes is seen and temperature dependent measurements indicate that the nonlinear processes are associated with an insulatormetal-like phase transition in the material, and thus that the electronic properties of the excited state are dramatically altered at high excited state densities. The observed behaviour is compared and contrasted to the changes in the optical properties upon photochemical modification of the pristine material via Raman spectroscopy. Application of a simple phenomenological model to calculate the contribution of intermolecular exchange and correlation energies in the excited state supports the proposal that the observed phenomena originate from a Mott-like phase transition. A further manifestation of this behaviour is the emergence of a broadband electroluminescent emission above a critical injection current density.

Acridinium salts as photoredox organocatalysts for photomediated cationic RAFT and DT polymerizations of vinyl ethers

2021 ◽  
Author(s):  
Marina Matsuda ◽  
Mineto Uchiyama ◽  
Yuki Itabashi ◽  
Kei Ohkubo ◽  
Masami Kamigaito
Keyword(s):  
Excited State ◽  
Vinyl Ethers ◽  
High Excited State

A series of acridinium salts with high excited-state oxidative power are employed as photoredox organocatalysts in conjunction with various thioesters, such as trithiocarbonate, dithiocarbamate, and xanthate, and thioacetals for photomediated...

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