Ion exchange-assisted surface passivation toward highly stable red-emitting fluoride phosphors for light-emitting diodes.

ABSTRACT: A facile and environmentally friendly ion exchange-assisted surface passivation (IASP) strategy is presented for synthesizing red emitting Mn⁴⁺-activated fluoride phosphors. A substantial, pristine Mn⁴⁺-free shell layer, applied as a coating to Mn⁴⁺ doped potassium fluorosilicate K₂SiF₆:Mn⁴⁺ (KSFM) phosphors, enhances both water resistance and luminescence efficiency. The stability test of fluoride in water at ambient temperature and boiling water demonstrates that IASP-treated KSFM phosphors are highly water resistant. Furthermore, both the negative thermal temperature (NTQ) fitting results and the photoluminescence (PL) decay confirm that the IASP process effectively passivates surface defects, leading to enhanced luminesc

SUBMITTER: Qiao X 

PROVIDER: S-EPMC11208521 | biostudies-literature | 2024 Jun

REPOSITORIES: biostudies-literature