TELKOMNIKA Telecommunication, Computing, Electronics and Control
The application of Ca5B2SiO10:Eu3+ and YAl3B4O12:Ce3+,Mn2+ in dual-layer remote phosphor to enhance lumen output and color quality of WLEDs

TELKOMNIKA Telecommunication, Computing, Electronics and Control
The application of Ca5B2SiO10:Eu3+ and YAl3B4O12:Ce3+,Mn2+ in dual-layer remote phosphor to enhance lumen output and color quality of WLEDs

Ca5B2SiO10:Eu3+
Color quality
Lumen output
Mie-scattering theory
WLEDs
YAl3B4O12:Ce3+,Mn2+

This study proposes a dual-layer remote phosphor structure, comprised of a
green or a red phosphor layer and a yellow YAG:Ce3+ phosphor layer, to
enhance color rendering index (CRI) and color quality scale (CQS) of white
light-emitting diodes (WLEDs). The phosphors used in this study are green
phosphor YAl3B4O12:Ce3+,Mn2+ and red phosphor Ca5B2SiO10:Eu3+. Besides,
the applied WLED structure has the color temperature of 8500 K. The study
demonstrates the idea of placing a green phosphor YAl3B4O12:Ce3+,Mn2+ or a
red Ca5B2SiO10:Eu3+ phosphor layer on the yellow phosphor YAG:Ce3+ one.
After that, the suitable concentration of Ca5B2SiO10:Eu3+ resulting in the
highest color quality is determined. The obtained results showed that
Ca5B2SiO10:Eu3+ is advantageous to CRI and CQS. Particularly, the values of
CRI and CQS increased following the growth of Ca5B2SiO10:Eu3+
concentration, due to the rise in red light components inside WLED’s
packages. Meanwhile, the luminous flux is benefited by the added green
YAl3B4O12:Ce3+,Mn2+ phosphor. However, there are decreases in lumen
output and color quality when the concentrations of Ca5B2SiO10:Eu3+ and
YAl3B4O12:Ce3+,Mn2+ rise over the corresponding levels. This result is
proved via using Mie-scattering theory and Lambert-Beer's law. In short, the
findings of the research paper are valuable references for high-light-quality
WLEDs fabrication.

Phan Xuan Le, Le Hung Tien

http://journal.uad.ac.id/index.php/TELKOMNIKA

Aug 5, 2021

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