Photoluminescence Study of Energy Transfer Processes in Erbium Doped AlxGal−xAs Grown by MBE

1993 ◽  
Vol 301 ◽  
Author(s):  
Tong Zhang ◽  
J. Sun ◽  
N.V. Edwards ◽  
D.E. Moxey ◽  
R.M. Kolbas ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Energy Levels ◽  
Coupling Efficiency ◽  
Thermal Quenching ◽  
Energy Bands ◽  
Doped Semiconductors ◽  
Co Doping ◽  
Erbium Ions ◽  
Erbium Doped ◽  
First Time

ABSTRACTSharp photoluminescence from the intra-4f shell of Er3+ is observed from erbium doped AlxGal-xAs (0 ≤x ≤ 1) grown by molecular beam epitaxy. The intensity of the luminescence from the erbium is strongly dependent on the aluminum composition with a maximum at x ≈ 0.6. We will present a model that explains the variation in intensity based on the energy transfer coupling efficiency between the host semiconductor and the optically active erbium ions. The coupling efficiency is dominated by the alignment or misalignment of the erbium energy levels with the energy bands of the host semiconductor and by the excess carrier lifetime in the host. The data and model, which are presented here for the first time, are consistent with our previous work on the effects of co-doping with Be or Si and with other workers' measurements of thermal quenching in rare earth doped semiconductors.

scholarly journals The Processes of Energy Transformation in Activated Laser Materials with Ions Er3 (Review)

2015 ◽  
Vol 16 (2) ◽  
pp. 245-252 ◽  
Author(s):  
A.H. Kevshyn ◽  
V. V. Halyan ◽  
T. A. Semenyuk
Keyword(s):  
Chalcogenide Glasses ◽  
Energy Levels ◽  
Excitation Energy Transfer ◽  
Optical Excitation ◽  
Cross Relaxation ◽  
Energy Transformation ◽  
Laser Materials ◽  
Erbium Ions ◽  
Erbium Doped ◽  
Transformation Processes

In paper the features of energy transformation processes in activated with erbium ions laser materials based on optical transitions in 4f shell of Er3+ ionwere discussed. Methods of excitation of the luminescence in chalcogenide glasses doped with Er3+ ions were described and found how its intensity depends on concentration of the ions. Up-conversion and cross-relaxation play an important role in the transformation of excitations in erbium-doped materials. In cross-relaxation the energy of one center can be nonradiatively transferred to another center or divided between the two centers, while in the up-conversion, however, energy of several centers summed up in one center, bringing it acts as an additional channel of luminescence quenching, or as a way of pumping of the higher energy levels. To improve the efficiency of optical excitation of many laser materials doped with erbium ions the sensitization with ytterbium ions that have intense absorption band in the range of ~0.9-1 µm with "effective" width of about 1000 cm-1 as well a channel of the efficient nonradiative excitation energy transfer to Er3+ ions is widely used. 

scholarly journals Соmparative Study: Сatalytiс Aсtivity and Rhоdamine Dye Luminesсenсe at the Surfaсe оf TiО2-Based Nanоheterоstruсtures

Symmetry ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1758
Author(s):  
Elizaveta Kоnstantinоva ◽  
Vladimir Zaitsev ◽  
Artem Marikutsa ◽  
Alexander Ilin
Keyword(s):  
Energy Transfer ◽  
Visible Light ◽  
Energy Levels ◽  
Band Gaps ◽  
First Time

Nanоheterоstruсtures based оn titanium, mоlybdenum, tungsten, and vanadium nanооxides with symmetriс сrystal struсtures, mоrphоlоgies and high phоtосatalytic aсtivity in under illuminatiоn by visible light, have been synthesized and studied. Miсrоsсоpy, оptiсal speсtrоsсоpy, and eleсtrоn-spin resоnanсe teсhniques were used. The asymmetriс separatiоn оf phоtо-generated hоles and eleсtrоns between different nanооxides in their nanоheterоstruсtures suppresses their reсоmbinatiоn. Using the methоd develоped by the authоrs and based оn ESR speсtrоsсоpy, the energy levels оf the aсtive сenters inside the band gaps оf the studied samples were fоund. We have shоwn, fоr the first time, that under illuminatiоn оf nanоheterоstruсtures under asymmetriс соnditiоns with adsоrbed rhоdamine dye at the dye-absоrptiоn wavelength (500 nm), phоtосatalytiс reaсtiоns are mainly determined by light absоrptiоn by the nanоstruсtures themselves, and nоt by energy transfer frоm the dye. This impоrtant result shоws that high phоtосatalytiс aсtivity оf materials with symmetriс сrystal struсtures is the primary сriteriоn fоr сreating energy-effiсient phоtосatalysts. The results will be useful fоr the develоpment оf energy-effiсient сatalytiс deviсes based оn variоus соmbinatiоns оf metal nanооxides.

Low-voltage driven ∼1.54 μm electroluminescence from erbium-doped ZnO/p+-Si heterostructured devices: Energy transfer from ZnO host to erbium ions

2013 ◽  
Vol 102 (18) ◽  
pp. 181111 ◽  
Author(s):  
Yang Yang ◽  
Yunpeng Li ◽  
Luelue Xiang ◽  
Xiangyang Ma ◽  
Deren Yang
Keyword(s):  
Energy Transfer ◽  
Low Voltage ◽  
Erbium Ions ◽  
Erbium Doped ◽  
Doped Zno

scholarly journals Laser Performance of Neodymium- and Erbium-Doped GYSGG Crystals

Crystals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 220
Author(s):  
Kai Zhong
Keyword(s):  
Average Power ◽  
Mode Locking ◽  
Laser Generation ◽  
Infrared Range ◽  
Laser Materials ◽  
Co Doping ◽  
Erbium Ions ◽  
Host Materials ◽  
Erbium Doped ◽  
Switching Mode

Garnet crystals possess many properties that are desirable in laser host materials, e.g., they are suitable for diode laser (LD) pumping, stable, hard, optically isotropic, and have good thermal conductivity, permitting laser operation at high average power levels. Recently, a new garnet material, GYSGG, was developed by replacing some of the yttrium ions (Y3+) with gadolinium ions (Gd3+) in YSGG, demonstrating great potential as a laser host material. GYSGG crystals doped with trivalent neodymium ion (Nd3+) and erbium ions (Er3+) were successfully grown for laser generation in the near- and mid-infrared range, with some of the laser performances reaching the level of mature laser gain media. This paper gives an overview of the achievements made in Nd3+- and Er3+-doped GYSGG lasers at different wavelength ranges. Additionally, full descriptions on Q-switching, mode-locking and wavelength-selecting methods for Nd:GYSGG, and the mechanisms of power scaling by co-doping sensitizers and deactivators in Er:GYSGG, are given. It is expected that this review will help researchers from related areas to quickly gain an understanding of these laser materials and promotes their commercialization and applications.

scholarly journals New Transition and Energy Levels of Three-Times Ionized Krypton (Kr IV)

Atoms ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 48
Author(s):  
M. Raineri ◽  
M. Gallardo ◽  
J. Reyna Almandos ◽  
A. G. Trigueiros ◽  
C. J. B. Pagan
Keyword(s):  
Transition Probabilities ◽  
Energy Levels ◽  
Pulsed Discharge ◽  
Core Polarization ◽  
Polarization Effects ◽  
Hartree Fock ◽  
Theta Pinch ◽  
New Energy ◽  
First Time

A capillary pulsed-discharge and a theta-pinch were used to record Kr spectra in the region of 330–4800 Å. A set of 168 transitions of these spectra were classified for the first time. We extended the analysis to twenty-five new energy levels belonging to 3s23p24d, 3s23p25d even configurations. We calculated weighted transition probabilities (gA) for all of the experimentally observed lines and lifetimes for new energy levels using a relativistic Hartree–Fock method, including core-polarization effects.

A Sims Study of Electroluminescent Phosphors: SrS:Cu

1999 ◽  
Vol 560 ◽  
Author(s):  
Lily H. Zhang ◽  
Larry Wang ◽  
Wusheng Tong ◽  
YongBao Xin
Keyword(s):  
Material Characterization ◽  
Secondary Ion Mass Spectrometry ◽  
Dopant Concentration ◽  
Thermal Quenching ◽  
Areal Density ◽  
Device Performance ◽  
Cell Temperature ◽  
Co Doping ◽  
Doping Effects ◽  
Secondary Ion

ABSTRACTThis study has used secondary ion mass spectrometry (SIMS) as a technique for thin film EL material characterization. It has shown that the Cu dopant concentration in the SrS films directly correlates with the luminescent brightness of the EL devices. A series of SrS:Cu,Y were grown using MBE to study the Y co-doping effects. It has been found that Y peak concentration and areal density in the SrS increased as the Y evaporation cell temperature was increased. The maximum PL intensity was found in the sample grown in the middle of the Y cell temperature range used. The Y co-doping has shown to reduce the thermal quenching effects in SrS EL devices. Therefore, in this series of samples, a good correlation has been found between Y and Cu concentration and the EL device performance characteristics.

scholarly journals Energy transfer triggered multicolor emissions in Tb3+/Eu3+-coacitivated Y2Mo3O12 negative thermal expansion micropartices for dual-channel tunable luminescent thermometer

2021 ◽  
Author(s):  
Peng Du ◽  
Laihui Luo ◽  
Yafei Hou ◽  
Weiping Li
Keyword(s):  
Thermal Expansion ◽  
Energy Transfer ◽  
Negative Thermal Expansion ◽  
Thermal Quenching ◽  
High Quality ◽  
Dual Channel ◽  
Color Tunable ◽  
Rational Control

Rational control of thermal quenching performance is crucial for achieving high quality luminescent thermometer. Herein, we report the Tb3+/Yb3+-coactivated Y2Mo3O12 (YMO) negative thermal expansion (NTE) microparticles with color-tunable emissions. Irradiated...

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