Determination of Water Vapor Transmission Rate by Electrical Calcium Test

• Main Authors: Lin SHIH HAN, 林詩涵
• Other Authors: Wen-Tuan Wu
• Format: Others
• Language: zh-TW
• Published: 104
• Online Access: http://ndltd.ncl.edu.tw/handle/46614790814544518986

碩士 === 南臺科技大學 === 光電工程系 === 103 === Recently organic light-emitting diode (OLED) is widely studies and applications. OLED becomes a new illumination technique for next generation. Efficiency improvement of OLED is the most popular subject in the lighting application. However, how to promote device lifetime is also an important issue. In this study, we establish a reliable water vapor transmission test method by using electrical calcium test to qualify the performance of UV glue applied in OLED edge sealed. We developed a simple calcium test method and discuss different factors that influence calcium test. First, we test three different kinds of UV glues. The results show that SOU-22 glue exhibits the lowest WVTR value which is about 1.6×10-3 g/m2/day; whereas LCD glue shows the highest WVTR values about 7.8×10-2 g/m2/day. Second, we perform two types of lamination: “edge seal” and “edge + side seals”. The result shows that “edge + side seals” has good isolation in water vapor and oxygen permeation. Third, we use CNT to replace desiccant for an application in OLEDs. Because the water absorbent in vertical-aligned CNT is higher than horizontal-distributed CNT, it accelerates the oxidation of calcium. Finally, we test WVTR values at high temperature and humidity. For 40℃/90%RH environment, the value of WVTR is one order higher than that tested under room temperature. The second experiment, we discuses Edge Seal Ca testing in the 85℃/85%RH environment, we observe calcium becomes smaller and smaller and calculate K values.