TELKOMNIKA Telecommunication Computing Electronics and Control
Research on advancing chromatic reproduction and luminosity of a WLED using triple-layer remote phosphor arrangement

TELKOMNIKA Telecommunication Computing Electronics and Control
Research on advancing chromatic reproduction and luminosity of a WLED using triple-layer remote phosphor arrangement

CaLaB3O7:Ce3+,Mn2+
Color quality
MgB2O4:Mn2+
Triple-layer structure
WLEDs

In this study, the use of triple-sheet phosphor arrangement (TRP) in
performing significant improvements to both color quality and luminous
flux of white light emitting diode (WLEDs) is introduced. The phosphor
layer of CaLaB3O7:Ce3+,Mn2+ is to accomplish green-spectra
enhancement for the boost of luminous efficacy (LE), while MgB2O4:Mn2+
red phosphor layer is for red-spectra enhancement to better color rendering
index (CRI) of WLEDs. The changes in these two phosphors’ concentrations
present considerable effects on the yellow phosphor YAG:Ce3+
concentration, the color quality scale (CQS), CRI, and LE. Findings display
the decrease of YAG:Ce3+ concentration accompanying the increase of red
and green phosphor concentrations, for the stabilized average correlated
color temperatures (ACCTs) between 6000 and 8500 K. Results also reveal
that greater content of MgB2O4:Mn2+ leads to greater CRI value.
Meanwhile using the increasing CaLaB3O7:Ce3+,Mn2+ concentration, the
CRI lowers considerably. CQS, on the other hand, can increase with
CaLaB3O7:Ce3+,Mn2+ concentration from 10% to 14%. Especially, given
the enhancement for the CRI as well as CQS, LE value will surge to more
than 40% due to the reduction of scattering light and the addition of green
light. The outcome of the study is a priceless reference for light emitting
diode (LED) producers.

Ha Thanh Tung, Huu Phuc Dang

http://telkomnika.uad.ac.id

Dec 26, 2022

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