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Hydrophobic coating of silicate phosphor powder using atmospheric pressure dielectric barrier discharge plasma
Author(s) -
Trinh Quang Hung,
Lee Sang Baek,
Mok Young Sun
Publication year - 2014
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14356
Subject(s) - phosphor , materials science , hexamethyldisiloxane , coating , dielectric barrier discharge , chemical engineering , thermal stability , contact angle , photoluminescence , silicate , atmospheric pressure plasma , atmospheric pressure , composite material , dielectric , plasma , optoelectronics , oceanography , physics , quantum mechanics , engineering , geology
A stable superhydrophobic coating was successfully deposited on commercial silicate‐based orange phosphor by using atmospheric pressure dielectric barrier discharge plasma with hexamethyldisiloxane (HMDSO) and HMDSO/toluene mixture as precursors. Owning to the good optical properties, the deposited film acts not only as a hydrophobic protective layer but also as an antireflection optical thin film capable of improving the phosphor photoluminescence efficiency. The plasma‐polymerized film based on SiOSi backbone containing methyl and phenyl nonpolar functional groups exhibited high‐water‐repellent characteristics. It was found that the water contact angle gradually increased with increasing the aging time and remained unchanged at about 140° after 1‐month aging. Besides, the thermal stability of the coated phosphor under high‐temperature condition was substantially enhanced by the aging. The findings of this work can contribute to improving the durability and reliability of the phosphor, eventually the long‐term stability of phosphor‐based light emitting diodes in practical applications. © 2014 American Institute of Chemical Engineers AIChE J , 60: 829–838, 2014