Luminescence Performance and Damp-heat Stability of K2SiF6:Mn4+ Phosphor Enhanced by Al2O3 Surface Coating
This study explores the use of atomic layer deposition(ALD)technology for encapsulating and modifying the surface of K2SiF6∶Mn4+(KSFM)red phosphors for white light emitting diodes(LEDs),and its impact on the struc-tural properties,luminescent characteristics,and stability in a humid and hot environment.The findings reveal that by employing ALD technology with trimethylaluminum as the precursor and ozone as the oxidant,an alumina coating can be formed on the surface of KSFM.X-ray diffraction and surface morphology analyses indicate that the ALD treat-ment process does not affect the crystal phase and morphology of the KSFM phosphors.Moreover,luminescence spectroscopy analysis demonstrates that the alumina coating,owing to its passivation properties,can enhance the lu-minescent intensity of KSFM phosphors without altering their emission wavelength.Furthermore,compared to un-coated KSFM phosphors,the coating layer can significantly enhance the damp-heat stability of KSFM powders.Fol-lowing a 24-hour aging treatment in an 85%humidity/85℃environment,samples coated with ALD maintain 84%of their initial luminescent intensity.
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