Superhydrophobic Encuplation For Organic Light-emitting Diodes

Organic light-emitting diode (organic light-emitting diodes, OLED) as a new generation of flat-panel display technology came into being and went into our vision gradually, its characteristics can be include as high luminous efficiency, self-luminous, wide viewing angle, fast response time, work at a low voltage, panel thickness, can produce large-size, flexible and panel production process simple, is a promising new type of flat panel displays. However, the development of OLED technology also need to face many problems. Wherein the lifetime of the OLED is one of the most important issues.This issue through the study of factors that affect the life of the OLED, improved the traditional OLED encapsulation process, developed a good hydrophobic flexible packaging film, the film production process is simple, repeatable, and to improve the OLED device life have a good effect. The hydrophobic membrane prepared as follows:the polystyrene xylene solution was spin-coated on a surface of the OLED device, and then in solution was spin-coated on the inorganic alumina film covering; after24hours, with an aqueous solution of NAOH inorganic alumina film was dissolved in room temperature, rinsed with deionized water several times and dried with nitrogen, drying and after24h, a superhydrophobic film can be made. Several times through our comparative experiments found that the concentration of the polystyrene solution in xylene at0.33g/ml, spin coating speed of2000r/min, the hydrophobic hydrophobic membrane to achieve the best effect. After testing, we prepared hydrophobic membrane hydrophobic angle can reach123°. Through the top emission, experimental proof of the white OLED device package, through the the traditional encapsulated OLED device half-life of14days, the package of the device through the hydrophobic membrane to improve the half-life of18days, proof hydrophobic membrane effectively improve the effect of the OLED device packageIn order to further study the hydrophobic membrane effect in the package, we designed a calcium film etching method to be tested. Calcium is very reactive metal, under normal circumstances, can easily react with water, the reaction equation:Ca+2H2O=Ca (OH)2+H2according to this formula, we need to calculate the water The reaction of the quantity of calcium in the amount of water can be calculated. A transition layer of150nm thick film of calcium was evaporated on a glass substrate, and using traditional methods and the hydrophobic membrane were packaged. Calcium film is not showing corrosion metallic silver, translucent white when corrosion. Taken through a microscope the changes of the calcium film, and binarization processing and computing the captured image using the compiled program, the corrosion area can be calculated by the calcium film. In order to study the influence of water vapor in the air and oxygen calcium film, we designed the one in the same temperature and humidity conditions, respectively, in comparative experiments under aerobic and anaerobic conditions to prove that the water vapor in the air is to affect the calcium film corrosion main factors. We also designed an experiment to prove that the hydrophobic membrane upgrade package effect is the greater in the case of the greater humidity.