scholarly journals Broadband photoluminescence in a ceramic (Mg2SnO4–SnO2):Cr3+ system

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
N. D. C. Santana ◽  
A. López ◽  
L. P. Sosman ◽  
S. S. Pedro
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Electronic Configuration ◽  
Infrared Region ◽  
Spectroscopic Studies ◽  
Crystal Field Theory ◽  
X Ray ◽  
Broadband Light Source ◽  
Near Infrared Region ◽  
Intense Emission

AbstractThis study reports the synthesis and photoluminescence spectroscopic studies of Cr3+-doped Mg2SnO4–SnO2 ceramics. The crystal structure was analyzed by X-ray powder diffraction, and photoluminescence was investigated at room temperature. The diffractogram confirmed the presence of Mg2SnO4 and SnO2 phases. Photoluminescence spectroscopy identified broad and intense emission bands assigned to the Cr3+ cation occupation in octahedral Mg2SnO4 sites and an orange band assigned to SnO2 emission. All spectra were analyzed and interpreted according to crystal field theory and Tanabe–Sugano theory for the d3 electronic configuration. The broad and intense emission band covering the visible/near-infrared region suggests that this system may be a promising material for use as an active medium in a broadband light source at room temperature.

Ligand Influence Versus Electronic Configuration of d-metal Ion in Determining the Fate of NIR Emission from LnIII Ions: A Case Study with CuII, NiII and ZnII Complexes.

2021 ◽  
Author(s):  
Abhineet Verma ◽  
Sk Saddam Hossain ◽  
Sailaja S Sunkari ◽  
Joseph Reibenspies ◽  
Satyen Saha
Keyword(s):  
Metal Ion ◽  
Selection Rule ◽  
Near Infrared ◽  
Electronic Configuration ◽  
Infrared Region ◽  
Direct Excitation ◽  
Characteristic Emission ◽  
Nir Emission ◽  
Near Infrared Region

Lanthanides (LnIII) are well known for their characteristic emission in the Near-Infrared Region (NIR). However, direct excitation of lanthanides is not feasible as described by Laporte’s parity selection rule. Here,...

scholarly journals Preparation single layer of (MgO) as antireflection coating using PLD technique

2018 ◽  
Vol 16 (36) ◽  
pp. 39-46
Author(s):  
Kadhim A. Aadim
Keyword(s):  
Near Infrared ◽  
Pulsed Laser ◽  
Single Layer ◽  
Infrared Region ◽  
Antireflection Coating ◽  
Laser Deposition ◽  
Optical Performance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Near Infrared Region

In this work preparation of antireflection coating with single layer of MgO using pulsed laser deposition (PLD) method which deposit on glass substrate with different thicknesses (90 and 100) nm annealed at temperature 500 K was done.The optical and structural properties (X-ray diffraction) have been determined. The optical reflectance was computed with the aid of MATLAB over the visible and near infrared region. Results shows that the best result obtained for optical performance of AR'Cs at 700 shots with thickness 90 nm nanostructure single layer AR'Cs and low reflection at wavelength 550 nm.

Photoluminescence Imaging and Discrimination of Threading Dislocations in 4H-SiC Epilayers

2013 ◽  
Vol 740-742 ◽  
pp. 653-656 ◽  
Author(s):  
M. Nagano ◽  
I. Kamata ◽  
H. Tsuchida
Keyword(s):  
Near Infrared ◽  
Imaging Technique ◽  
Spot Size ◽  
Infrared Region ◽  
Threading Dislocations ◽  
Cross Sectional ◽  
Screw Dislocations ◽  
X Ray ◽  
Near Infrared Region ◽  
Edge Dislocations

Photoluminescence images and spectra of threading screw dislocations (TSDs) and threading edge dislocations (TEDs) were obtained and compared with synchrotron X-ray topography images. Discrimination between TSDs and TEDs by analysis of PL spot size in the imaging technique as well as PL spectra of the dislocations in a near infrared region is demonstrated. We also have succeeded in cross-sectional PL imaging of threading dislocations in a thick epilayer.

Spectroscopic Investigation of γ-LiAlO2 Ceramic Doped with Tetrahedrally Coordinated Cr3+ Ions

2013 ◽  
Vol 785-786 ◽  
pp. 701-705
Author(s):  
Jian Ma
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Factor Model ◽  
Infrared Region ◽  
Experiment Data ◽  
Crystal Field Theory ◽  
Microwave Furnace ◽  
Calculation Results ◽  
Multi Mode ◽  
Good Agreement

The γ-LiAlO2: Cr3+ ceramics were successfully fabricated using multi-mode cavity microwave furnace, and the samples absorption spectrum was measured at room temperature. There are five bands in the red and near-infrared region. Using the crystal-field theory and introducing the average covalent factor model, we calculated the energy-level splitting of Cr3+ ions in γ-LiAlO2 and successfully explained these bands. These calculation results are in good agreement with the optical experiment data.

Highly luminescent InP-In(Zn)P/ZnSe/ZnS core/shell/shell colloidal quantum dots with tunable emission synthesized based on growth-doping

2021 ◽  
Author(s):  
Cong Shen ◽  
Yan Qing Zhu ◽  
Zixiao Li ◽  
Jingling Li ◽  
Hong Tao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Infrared Region ◽  
Colloidal Quantum Dots ◽  
High Quality ◽  
Promising Alternative ◽  
Lower Toxicity ◽  
Near Infrared Region ◽  
Inp Quantum Dots ◽  
Tunable Emission

InP quantum dots (QDs) are considered as the most promising alternative to Cd-based QDs with the lower toxicity and emission spectrum tunability ranging from visible to near-infrared region. Although high-quality...

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