Title :
New permeation rate measurement for thin film encapsulation of organic light emitting diodes
Author :
Zhang, Hao ; Zhang, Minyan ; Sang, Renzheng ; Long, Li ; Bin Wei ; Feng, Tao ; Zhang, Jianhua
Author_Institution :
Sch. of Mech. & Electron. Eng. & Autom., Shanghai Univ., Shanghai, China
Abstract :
We have developed a new method to measure the water vapor transmission ratio (WVTR) for thin film encapsulation (TFE) of organic light emitting diodes (OLEDs). It is a nondestructive method to measure WVTR by investigating the change of photoluminescent spectra of organic material. This method can be realized easily by online test. By calibrating the evolution curve (the photoluminescent intensity versus time), we have figured out the relative water transmission which was responded by organic materials. The WVTR of TFE devices is estimated to be about 2.0 × 10-2 gm-2 day-1 in a controlled environment of 85% relative humidity (RH) at 38°C. Novel thin film encapsulation devices have also been presented.
Keywords :
encapsulation; nondestructive testing; organic light emitting diodes; thin film devices; OLED; TFE devices; WVTR measurement; evolution curve calibration; nondestructive method; organic light emitting diodes; organic material; permeation rate measurement; photoluminescent spectra; relative humidity; temperature 38 degC; thin film encapsulation devices; water vapor transmission ratio; Chemical vapor deposition; Encapsulation; Equations; Films; Organic light emitting diodes; Organic materials; Substrates;
Conference_Titel :
Electronic Packaging Technology and High Density Packaging (ICEPT-HDP), 2011 12th International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4577-1770-3
Electronic_ISBN :
978-1-4577-1768-0
DOI :
10.1109/ICEPT.2011.6067037
