Protective sol-gel coating on silicate phosphor used in light emitting diodes |
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Authors: | JP Kim SB Song |
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Institution: | Solid State Lighting Technology Center, Korea Photonics Technology Institute (KOPTI), 5 Cheomdan 4gil, Buk-Gu, Gwangju 500-779, Republic of Korea |
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Abstract: | In this study, an orange-red silicate phosphor that is used in light emitting diodes (LEDs) was coated with a SiO2 blocking layer via a sol-gel reaction of tetra-ethyl ortho-silicate (TEOS) to investigate its reliability as an encapsulant. A sol-gel coating protects the phosphor surface from moisture and reactive materials and improves the reliability of the phosphor. The efficacy of the phosphor coating following an 85 °C and 85 relative humidity (Rh)% test decreased by 7%, whereas an uncoated phosphor coating decreased by 35%. A SiO2 sol-gel coating decreases the luminous efficiency by a small amount with each coating. |
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Keywords: | Phosphor LED Sol-gel coating Reliability Encapsulant |
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