Effects of oxidization and deoxidization on charge-propagation dynamics in rare-earth-doped titanium dioxide with room-temperature luminescence

2012 ◽  
Vol 111 (5) ◽  
pp. 053514 ◽  
Author(s):  
Masashi Ishii ◽  
Brian Towlson ◽  
Nigel Poolton ◽  
Susumu Harako ◽  
Xinwei Zhao ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Rare Earth ◽  
Room Temperature ◽  
Doped Titanium Dioxide ◽  
Propagation Dynamics ◽  
Charge Propagation ◽  
Rare Earth Doped ◽  
Room Temperature Luminescence

Electrically Induced Ferromagnetism at Room Temperature in Cobalt-Doped Titanium Dioxide

Science ◽  
2011 ◽  
Vol 332 (6033) ◽  
pp. 1065-1067 ◽  
Author(s):  
Y. Yamada ◽  
K. Ueno ◽  
T. Fukumura ◽  
H. T. Yuan ◽  
H. Shimotani ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Room Temperature ◽  
Doped Titanium Dioxide

Investigations on the Rare Earth Terpyridyl System

1965 ◽  
Vol 20 (6) ◽  
pp. 835-837 ◽  
Author(s):  
Shyama P. Sinha
Keyword(s):  
Rare Earth ◽  
Room Temperature ◽  
Free Ligand ◽  
Ground Level ◽  
Phosphorescence Spectrum ◽  
Rare Earth Ions ◽  
Luminescence Spectra ◽  
Heterocyclic Ligands ◽  
Phosphorescence Lifetime ◽  
Room Temperature Luminescence

The room temperature luminescence spectra of the monoterpyridyl chelates of trivalent samarium, dysprosium and thulium have been studied in solid state by exciting with monochromatic radiation of 3200 Å. The spectra of these chelates show intra f → f fluorescent transitions of the chelated rare earth ions as well as the molecular band fluorescence. The “bottleneck” nature of the energy transfer from the nitrogen containing heterocyclic ligands to the coordinated rare earth ions is proposed. The fluorescence data of mono-terpyridyl chelates have been compared with those of bis-dipyridyl one.The phosphorescence spectrum of terpyridyl has also been investigated. The lowest triplet state of the free ligand is found at 22 940 cm-1 above the ground level. The phosphorescence lifetime of terpyridyl is about 2 sec

Room-temperature luminescence from rare-earth ions implanted into Si nanocrystals

2000 ◽  
Vol 80 (4) ◽  
pp. 719-728 ◽  
Author(s):  
Giorgia Franzó ◽  
Vincenzo Vinciguerra ◽  
Francesco Priolo
Keyword(s):  
Rare Earth ◽  
Room Temperature ◽  
Rare Earth Ions ◽  
Si Nanocrystals ◽  
Room Temperature Luminescence

Processing of rare earth doped GaN with ion beams

2003 ◽  
Vol 798 ◽  
Author(s):  
K. Lorenz ◽  
U. Wahl ◽  
E. Alves ◽  
T. Wojtowicz ◽  
P. Ruterana ◽  
...  
Keyword(s):  
Rare Earth ◽  
Room Temperature ◽  
Lattice Site ◽  
Rutherford Backscattering Spectrometry ◽  
Structural Defects ◽  
Site Location ◽  
Transmission Electron ◽  
Infra Red ◽  
Optical Activation ◽  
Rare Earth Doped

ABSTRACTGaN epilayers grown by MOCVD were implanted with different fluences of thulium at room temperature and at 500 °C in order to find the optimum implantation conditions. Rutherford backscattering spectrometry in the channeling mode was used to monitor the damage evolution in the Ga-sublattice and to establish the lattice site location of the thulium ions. The nature of structural defects was studied with transmission electron microscopy and the optical properties of the samples with room temperature cathodoluminescence. The introduced damage could be significantly reduced by implantation at high temperature for fluences up to 5×1015 Tm/cm2. Annealing was necessary for optical activation of the implanted samples, in all cases. After annealing, sharp rare earth related emissions were observed in the blue and in the near infra-red spectral region.

Ultra-sensitive and selective NH3 room temperature gas sensing induced by manganese-doped titanium dioxide nanoparticles

2017 ◽  
Vol 504 ◽  
pp. 371-386 ◽  
Author(s):  
Zamaswazi P. Tshabalala ◽  
Katekani Shingange ◽  
Franscious R. Cummings ◽  
Odireleng M. Ntwaeaborwa ◽  
Gugu H. Mhlongo ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Room Temperature ◽  
Gas Sensing ◽  
Titanium Dioxide Nanoparticles ◽  
Doped Titanium Dioxide

Rare-Earth-doped Laser Materials: Spectroscopy and Laser Properties

2012 ◽  
Vol 1471 ◽  
Author(s):  
Larry D. Merkle
Keyword(s):  
Rare Earth ◽  
Room Temperature ◽  
Liquid Nitrogen Temperature ◽  
Spectroscopic Properties ◽  
Rare Earth Ions ◽  
Laser Materials ◽  
Army Research Laboratory ◽  
Trivalent Rare Earth ◽  
Heavily Doped ◽  
Rare Earth Doped

ABSTRACTTrivalent rare earth ions in crystalline or fiber hosts are among the most successful of laser materials, but new dopant-host combinations and more detailed understanding of existing materials continue to be needed. This paper presents a few examples from the work of our team at the Army Research Laboratory, highlighting the interrelation between spectroscopic properties and laser behavior. It focuses on bulk solids, though rare-earth-doped fiber lasers are also extremely important. One system discussed is Nd:YAG, particularly concentration quenching in heavily doped ceramic YAG. Spectroscopic properties of Yb:Y2O3 and Yb:Sc2O3 help to elucidate their laser performance. Spectra indicate that Er:YAG is more promising than Er:Sc2O3 for room temperature laser operation, but that the reverse is true for operation at and somewhat above liquid nitrogen temperature.

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