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Download fileColor Control of Pr3+ Luminescence by Electron–Hole Recombination Energy Transfer in CaTiO3 and CaZrO3
journal contribution
posted on 2017-06-21, 00:00 authored by Zoila Barandiarán, Marco Bettinelli, Luis SeijoControlling luminescence in phosphors
able to produce several emissions
from different stable excited states determines their use in optical
devices. We investigate the color control mechanism that quenches
the greenish-blue emission in favor of the red one in the archetype
phosphor CaTiO3:Pr3+. State-of-the-art ab initio
calculations indicate that direct host-to-dopant energy transfer (released
by electron–hole recombination following the interband excitation
and structural reorganization) selectively populates the 1D2 red luminescent state of Pr3+ and bypasses
the 3P0 greenish-blue emitter. Local defects
can modulate the electron–hole recombination energy and therefore
increase the red emission efficiency, as experimentally observed.
The selection of red emission does not happen in CaZrO3:Pr3+ because the electron–hole recombination energy
is much higher. The calculations could not support the widely accepted
color control mechanism based on metal-to-metal charge transfer states.
The conclusion sets new points of view for the color control of lanthanide
activated inorganic phosphors.
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Prhost-to-dopant energy transfercolor control mechanismcolor control1 D 2emission efficiencygreenish-blue emissionCaTiO 3color ControlCaZrO 3State-of-the-art ab initio calculationsCaZrO 3 Controlling luminescencearchetype phosphor CaTiO 3interband excitationelectronLocal defects3 P 0 greenish-blue emitterconclusion setsrecombinationmetal-to-metal charge transfer states