Abstract
We investigate photoluminescence of Eu-related emission in a GaN host consisting of thin layers grown by organometallic vapor-phase epitaxy. By comparing it with a reference sample of Eu-doped Y2O3, we find that the fraction of Eu3+ ions that can emit light upon optical excitation is of the order of 1%. We also measure the quantum yield of the Eu-related photoluminescence and find this to reach (~10%) and (~3%) under continuous wave and pulsed excitation, respectively.
Highlights
IntroductionWe investigate photoluminescence of Eu-related emission in a GaN host consisting of thin layers grown by organometallic vapor-phase epitaxy
We investigate photoluminescence of Eu-related emission in a GaN host consisting of thin layers grown by organometallic vapor-phase epitaxy. By comparing it with a reference sample of Eu-doped Y2O3, we find that the fraction of Eu31 ions that can emit light upon optical excitation is of the order of 1%
The europium in this reference sample, by being embedded in a non-active and insulating host matrix without any defects that can act as quenching centers, has an internal quantum efficiency of over 90% with, basically all Eu is participating in emission; the reference sample can be used as a way to calibrate the optical accessibility of europium in other matrices
Summary
We investigate photoluminescence of Eu-related emission in a GaN host consisting of thin layers grown by organometallic vapor-phase epitaxy By comparing it with a reference sample of Eu-doped Y2O3, we find that the fraction of Eu31 ions that can emit light upon optical excitation is of the order of 1%. Past research has revealed that a variety of Eurelated emitting centers, as well as a variety of energy transfer routes exist[10,11,12,13,14] These findings imply that the potential for improvement of emission is mainly to be found in material engineering towards optimization of the energy transfer between the GaN-host and Eu31 ions[3,4,5,6]. The chosen material can be suitably used as a reference, allowing for the determination of the percentage of Eu31 ions contributing to the photo-luminescence, i.e., being optically accessible
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