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송광염,장인석,전시욱,안선희,김자연,김소영,사기동 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
The photo-performance and color uniformity of the light-emitting diodes (LEDs) were enhanced bycontrolling the surface properties of the titanium dioxide (TiO2) particles as light scatting materials using asol-gel-based surfacemodificationmethod.Silane couplingagentsofdifferentcarbonchainlengths(C3–C16)were introduced onto the TiO2 surface for investigating the light scattering effect depending on the TiO2dispersibility in the encapsulant. The dispersibility of the modified TiO2 particles was greater than that of theas-prepared TiO2 particles (1.6–2.5 times). The dispersibility of TiO2 improved with the increasing carbonchain length of silane (C3–C6). However, the dispersibility did not increase but reduced when the carbonchain length was considerably long (C16) because the TiO2 surface was more hydrophobic than theencapsulant. After the fabrication of the LED devices, the TiO2-loaded LED device showed high photometricflux and low correlated color temperature despite using the same concentration of phosphor (3.0 wt.% withrespect to the added silicone resin). Furthermore, the photo-performance and color uniformity improvedwhen the TiO2 dispersibility was increased. This can be attributed to the enhancement of light scattering inthe LED package when the interfacial affinity of the TiO2/encapsulant was improved.
적색 형광체 신뢰성 향상을 위한 코팅 형광체의 고진공 조건 열처리에 관한 연구
송광염(Gwang Yeom Song) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.2
In this study, a coating layer was formed on the surface of the phosphor to increase the reliability of the red phosphor, and annealing was performed to improve the moisture barrier performance of the coating layer. The SiO₂ coating film on the surface of the K₂SiF<SUB>6</SUB>:Mn<SUP>4+</SUP>(KSF) red phosphor was formed by the Sol-Gel method. In order to solve the problem of the rapid drop in the initial quantum efficiency during the heat treatment of the KSF phosphors, various vacuum heat treatment conditions were studied. As a result, the initial quantum efficiency drop was minimized at high vacuum conditions above 10<SUP>-4</SUP> torr. Finally, through the optimized high vacuum annealing, the moisture reliability of the coated KSF phosphor was improved.
박희경,조재승,홍희경,송광염,허재영 한국물리학회 2015 Current Applied Physics Vol.15 No.9
The effect of growth temperature on the phase evolution and morphology change of tin sulfide thin films by electron-beam evaporation was investigated. Orthorhombic tin monosulfide (SnS) was dominant at low growth temperature of 25 ℃, whereas a sulfur-rich phase of Sn2S3 coalesced as the growth temperature increased over 200 ℃. Thin film growth ceased at 280 ℃ due to re-evaporation of the tin sulfide. The dependence of growth temperature on the phase evolution of tin sulfide was confirmed by X-ray diffraction, scanning electron microscopy, and UVeVis spectrophotometry. The lowest electrical resistivity of ~51 Ω cm, with a majority hole concentration of ~1017 cm-3, was obtained for the film grown at 100 ℃, and the resistivity drastically increased with increasing growth temperature. This behavior was correlated with the emergence of resistive sulfur-rich Sn2S3 phase at high temperatures.