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Natural SciencesMaterials EngineeringMaterials ScienceCrystal StructureElectronic MaterialsSpectroscopyEmission SpectroscopyEpitaxial GrowthLuminescent MaterialsRare-earth-doped MaterialsSemiconductor Crystal GrowthLanthanide LuminescenceLuminescence MechanismsRare-earth-doped CrystalsRare-earth-doped Luminescent Materials