Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 8, Pages 7232-7240Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b14012
Keywords
K2SiF6:Mn4+; moisture-resistant; oleic acid; solvothermal; and red phosphor
Funding
- Strategic Key-Material Development and the Materials and Components Research and Development bodies - Ministry of Knowledge Economy (MKE, Korea)
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT AMP
- Future Planning [NRF-2014R1A1A1002909, 2016R1E1A2020571]
- National Research Foundation of Korea [2016R1E1A2020571] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A moisture-stable, red-emitting fluoride phosphor with an organic hydrophobic skin is reported. A simple strategy was employed to form a metal-free, organic, passivating skin using oleic acid (OA) as a hydrophobic encapsulant via solvothermal treatment. Unlike other phosphor coatings that suffer from initial efficiency loss, the OA-passivated K2SiF6:Mn4+ (KSF-OA) phosphor exhibited the unique property of stable emission efficiency. Control of thickness and a highly transparent passivating layer helped to retain the emission efficiency of the material after encapsulation. A moisture-stable KSF-OA phosphor could be synthesized because of the exceptionally hydrophobic nature of OA and the formation of hydrogen bonds (F...H) resulting from the strong interactions between the fluorine in KSF and hydrogen in OA. The KSF-OA phosphor exhibited excellent moisture stability and maintained 85% of its emission intensity even after 450 h at high temperature (85 degrees C) and humidity (85%). As a proof-of-concept, this strategy was used for another moisture-sensitive SrSi2O2N2:Eu2+ phosphor which showed enhanced moisture stability, retaining 85% of emission intensity after 500 h under the same conditions. White light-emitting were fabricated using surface-passivated KSF and Y3Al5O12:Ce3+ which exhibited excellent color rendering index of 86, under blue LED excitation.
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