The Analysis of Physical and Chemical Adsorption of Dysprosium Ions as Functions of the Temperature and Time in Terms of Boubaker Polynomials | Chapter 1 | Current Research Progress in Physical Science Vol. 3

 

In the present work, analytical solutions to the differential equation systems governing the kinetics of dysprosium adsorption within particular hosting edifices are presented. The chemical adsorption kinetics of rare earth elements inside regular crystalline materials such as ZnO are discussed. An approximate analytical expression of the non-steady-state doping concentrations is deduced by using the Boubaker polynomial expansion scheme (BPES). The results concerning the particular case of the dysprosium ion Dy3+ are discussed and evaluated in terms of temperature and time. In addition to an exponential parabolic time-dependent behavior, a notable temperature gradient is noted. Above a certain temperature limit, the reaction starts to occur and pertains to the energy needed to promote a 4f electron to the valence band.

 

Author(s) Details

A. Yumak
Department of Physics, Marmara University, Göztepe Kampus, 34722 Kadiköy, Istanbul, Turkey.

 

Please see the book here:- https://doi.org/10.9734/bpi/crpps/v3/467

Review of Rare-earth Ion Doped Phosphors for White Light Generation | Chapter 5 | New Trends in Physical Science Research Vol. 8

 

The design of phosphor coatings for diode pumped solid state lighting applications is the main topic of this review. On the historical progression of light bulb evolution, a succinct review is given. The suitability of rare-earth doped phosphor materials for the production of white light is discussed. For a number of materials, including crystals and glasses impregnated with rare-earth ions, colour coordinates and colour temperatures are measured. Sm, Dy, Tb, Eu, and Dy ion spectroscopic data under 405 and 375 nm diode laser excitations are presented. Data analysis revealed that the type of dopant ions in the phosphor material and pump wavelength determine whether a phosphor coated diode outputs warm white light, day light, or cold white light. Our research shows that Tb, Eu, or Dy doped halide crystals produce white light when excited by a diode laser. However, Sm, Dy, and Tb-infused glasses produce white or warm white light.

Author(s) Details:

Rami Reddy Bommareddi,
Alabama A&M University, Department of Physics, Chemistry and Mathematics, Normal, AL 35762, USA .

Please see the link here: https://stm.bookpi.org/NTPSR-V8/article/view/7884