Luminescence of Rare Earth Doped Porous Silicon

1996 ◽  
Vol 422 ◽  
Author(s):  
T. Kimura ◽  
I. Hosokawa ◽  
Y. Nishida ◽  
T. Dejima ◽  
R. Saito ◽  
...  
Keyword(s):  
Rare Earth ◽  
Porous Silicon ◽  
Room Temperature ◽  
Luminescence Decay ◽  
Rare Earth Ions ◽  
Energy Transfer Mechanism ◽  
Free Atmosphere ◽  
Optical Activation ◽  
P Type ◽  
Rare Earth Doped

AbstractPhotoluminescence characteristics of porous silicon layers (PSLs) doped with Er or Yb ions are studied. 10μm thick PSLs with a luminescence centered at ∼ 0.8μm are formed by anodic etching of p-type silicon wafers of several Ω-cm resistivity. Rare-earth ions are electrochemically incorporated into PSLs. The Er3+-related luminescence at 1.54μm as well as the Yb3+-related luminescence at 1.0μm is observed at room temperature after annealing at high temperatures (>900°C). The Er-related luminescence is enhanced after annealing in O2, whereas the Yb3+-related luminescence needs oxygen-free atmosphere (H2) for the optical activation. The luminescence decay time of the rare earth ions as well as the host PSLs is measured and the energy transfer mechanism is discussed.

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.

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.

Rare Earth Doped Zinc Oxide Nanowires

2008 ◽  
Vol 8 (1) ◽  
pp. 244-251 ◽  
Author(s):  
S. Geburt ◽  
D. Stichtenoth ◽  
S. Müller ◽  
W. Dewald ◽  
C. Ronning ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Rare Earth ◽  
Thermal Quenching ◽  
Wide Band ◽  
Wide Band Gap ◽  
Oxide Nanowires ◽  
Defect Sites ◽  
Optical Activation ◽  
Re Elements ◽  
Rare Earth Doped

Zinc oxide (ZnO) nanowires were grown via thermal transport and subsequently doped with different concentrations of Tm, Yb, and Eu using ion implantation and post annealing. High ion fluences lead to morphology changes due to sputtering; however, freestanding nanowires become less damaged compared to those attached to substrates. No other phases like rare earth (RE) oxides were detected, no amorphization occurs in any sample, and homogeneous doping with the desired concentrations was achieved. Photoluminescence measurements demonstrate the optical activation of trivalent RE-elements and the emission of the characteristic intra-4f-luminescence of the respective RE atoms, which could be assigned according to the Dieke-diagram. An increasing RE concentration results into decreasing luminescence intensity caused by energy transfer mechanisms to non-radiative remaining implantation defect sites. Furthermore, low thermal quenching was observed due to the considerable wide band gap of ZnO.

Room temperature p-orbital magnetism in carbon chains and the role of group IV, V, VI, and VII dopants

Nanoscale ◽  
2018 ◽  
Vol 10 (23) ◽  
pp. 11186-11195 ◽  
Author(s):  
C. H. Wong ◽  
E. A. Buntov ◽  
A. F. Zatsepin ◽  
J. Lyu ◽  
R. Lortz ◽  
...  
Keyword(s):  
Rare Earth ◽  
Transition Metals ◽  
Room Temperature ◽  
Group Iv ◽  
Rare Earth Ions ◽  
Next Generation ◽  
Spintronic Devices ◽  
Carbon Chains ◽  
Orbital Magnetism

The study of magnetism without the involvement of transition metals or rare earth ions is considered the key to the fabrication of next-generation spintronic devices.

Luminescent Properties of Rare Earth Doped AlF3-Based Glasses

1991 ◽  
Vol 244 ◽  
Author(s):  
L. R. Copeland ◽  
W. A. Reed ◽  
M. R. Shahriari ◽  
T. Iqbal ◽  
P. Hajcak ◽  
...  
Keyword(s):  
Rare Earth ◽  
Optical Fibers ◽  
Luminescent Properties ◽  
Rare Earth Ions ◽  
Ion Concentration ◽  
Fluoride Glass ◽  
Oxide Glasses ◽  
Low Loss ◽  
Rare Earth Ion ◽  
Rare Earth Doped

ABSTRACTRare earth ions can easily be incorporated into fluoride glasses in moderate to large concentrations and, due to their low phonon energy, these glasses appear to have many advantages over oxide glasses as hosts for rare earth ions used in optical amplifiers and lasers. We have therefore investigated the optical properties of Pr3+, Pr3+/Yb3+ and Pr3+/Yb3+/Lu3+ doped bulk AIF3-based glass samples as a function of rare earth ion concentration. We find that the addition of 2 wt% of Yb increases the fluorescence of Pr3+ at 1.32 μm by a factor of 35 when excited with 488 nm radiation. The fluorescence intensity and excited state lifetimes are found to be comparable to those measured for Pr in a ZBLAN host. Since it has also been demonstrated that optical fibers drawn from AIF3-based glasses exhibit relatively low loss (< 0.05 dB/m) and posses superior chemical durability compared to other fluotide glasses, it is possible that AIF3 glasses may become the fluoride glass of choice for practical fiber laser and amplifier applications.

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

scholarly journals Upconversion and Spectroscopic Properties of Rare Earth Codoped Lead Borate Glass Matrix

2017 ◽  
Vol 14 (2) ◽  
pp. 140-145 ◽  
Author(s):  
K. Goud ◽  
Ch. Ramesh ◽  
B. Appa Rao
Keyword(s):  
Rare Earth ◽  
Visible Region ◽  
Branching Ratio ◽  
Life Time ◽  
Rare Earth Ions ◽  
Borate Glasses ◽  
Energy Transfer Mechanism ◽  
Lead Borate ◽  
Ofelt Theory ◽  
Laser Materials

To develop efficient upconversion laser materials in the visible region an active lead borate glasses doped with Er3+/Yb3+ rare earth ions (GEY) has been studied extensively. In this investigation characterization techniques like Optical absorption, FTIR and photoluminescence were recorded and the data was analyzed. To evaluate the values of Ω2, Ω4 and Ω6 Judd-Ofelt theory has been applied to the f ↔ f transitions. Based on Judd–Ofelt theory branching ratio (βr) oscillator strength and the radiative life time (τR) values were determined. The upconversion spectra exhibited three emission bands at around 525 nm (2H11/2 ® 4I15/2), 545 nm (4S3/2 ® 4I15/2) and 660 nm (4F9/2 ® 4I15/2). The energy transfer mechanism between Yb3+ and Er3+ was discussed very clearly. Comparing the data obtained in other Er3+/Yb3+ doped materials, the lead bismuth gallium borate glasses doped with 0.6 mol% of Er2O3­/0.2 mol% of Yb2O3 ions are suitable materials for developing red upconversion lasers in the visible region.

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