Cerium-europium double activated terbium aluminum garnet phosphor for led application
Y3Al5O12:Ce3 (YAG:Ce) and Tb3Al5O12:Ce3 (TAG:Ce) both show the typical Ce3 ion luminescence of the allowed Ce3 d–f transition. Eu3 codoping, however, reveals different results for both matrices: in YAG:Ce, Eu only the luminescence of the Ce3 ion occurs by excitation within the Ce3 a...
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
D.Ghitu Institute of Electronic Engineering and Nanotechnologies
2006
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/637680aed37d4ffe80cb696f2ae62faa |
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| Sumario: | Y3Al5O12:Ce3
(YAG:Ce) and Tb3Al5O12:Ce3
(TAG:Ce) both show the typical Ce3
ion
luminescence of the allowed Ce3
d–f transition. Eu3
codoping, however, reveals different
results for both matrices: in YAG:Ce, Eu only the luminescence of the Ce3
ion occurs by excitation within the Ce3
absorption bands, because the Eu3
luminescence cannot be sensitized
by the Ce3
ion. In TAG:Ce, Eu, both Ce3
and Eu3
luminescence was measured at different
Ce and Eu activator concentrations. It is not surprising as an energy transfer from Tb3
to Ce3
and Eu3
is well known in literature. In addition, an excitation in the lowest 5d level of Ce 3
delivers Eu3
luminescence at room temperature. This means that the Ce3
ion can be used as
a sensitizer in the TAG lattice that transfers its energy via the Tb sublattice to the activator
Eu3
. Application of TAG:Ce, Eu with improved CRI in LED device is demonstrated.
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