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High efficiency, persistent, non-saturating rare-earth phosphors are described. The improved persistence reduces the flicker observed in some display applications.
English (United States)
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Luminescent Germanate Garnets with Terbium on Dodecahedral and
Octahedral Lattice Sites
High efficiency, persistent, non-saturating rare-earth phosphors are
described. The improved persistence reduces the flicker observed in some
(Ca(Tb))(3) Ga(2)Ge(3)O(12) and Sr(3)(Y(Tb))(2) Ge(3)O(12) garnets
provide a cubic structure with trivalent terbium, a luminescent rare earth, in
dodecahedral 8 oxygen neighbors) and in octahedral (6 oxgyen neighbors) sites,
respectively. In the materials examined, Tb+++ in octahedral sites has a
narrower fluorescence emission spectrum, higher luminescence efficiency and a
longer lifetime than in dodecahedral sites. The luminescence properties and the
unit cell size of the Ca(3)Y(2)Ge(3)O(12) garnet, where Tb+++ is expected to be
located on octahedral sites, are between those of the CaGa and SrY garnets. All
these garnets are phosphorescent. On the basis of the variation with
temperature of the phosphorescence decay law, it is proposed that the radiative
electron-hole recombination process proceed via a tunneling mechanism at
temperatures below the thermal glow peaks, and via a free carrier diffusion
mechanism at temperatures above the thermal glow peaks.
All three Tb+++ -doped germanate garnets have sufficiently high efficiency
and persistence under electron-beam excitation to be suitable for practical
phosphor applications. The strontium yttrium germanate Tb material has a
cathodoluminescence decay time nearly thr...