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
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