TELKOMNIKA Telecommunication, Computing, Electronics and Control
MgCeAl11O19:Tb3+ and Mg8Ge2O11F2:Mn4+ in enhancing the color quality of remote phosphor LED

TELKOMNIKA Telecommunication, Computing, Electronics and Control
MgCeAl11O19:Tb3+ and Mg8Ge2O11F2:Mn4+ in enhancing the color quality of remote phosphor LED

Color quality scale
Luminous flux
Remote phosphor package
Triple-layer structure
WLEDs

As the name infers, the triple-layer remote phosphor (TRP) has 3 phosphor
layers includes the red Mg8Ge2O11F2:Mn4+ phosphor layer on the top, the
green MgCeAl11O19:Tb3+ phosphor layer in the middle, and the yellow
YAG:Ce3+ layer at the bottom and is mentioned as a solution to increase the
chromaticity and luminescence adequacy of the white LEDs (WLEDs) in this
article. As to control the red light for higher value achieve in the color
rendering index (CRI), using red Mg8Ge2O11F2:Mn4+ phosphor in the TRP
structure is recommended. All the outcomes indicate that when red phosphor
Mg8Ge2O11F2:Mn4+ concentration grows the CRI gets higher values, and
drastically declines when the concentration of green phosphor
MgCeAl11O19:Tb3+ increases. As the same time, applying the green
MgCeAl11O19:Tb3+ phosphor layer to manage the green light as it can make
the luminous efficacy (LE) of WLEDs increase. In particular, the index of
LE can also be improved over 40% by limiting the scatter of light and putting
in green light. Moreover, to preserve the average correlated color
temperature (ACCT) stable at 8500K, the yellow YAG:Ce3+ concentration
must be cut down as the concentration of red and green phosphor rise.

My Hanh Nguyen Thi, Phung Ton That

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

Mar 5, 2021

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