Papers by Keyword: Roll-Off

Abstract: Inverted organic light-emitting diodes (IOLEDs) have a bottom cathode, making them convenient to integrate with the preferred n-type active matrix OLED driving technologies. Furthermore, inverted OLEDs show much better air-stability compared with conventional OLEDs, due to the very reactive and sensitive of alkali doped electron injection layer (EIL) towards ambient oxygen and moisture. For inverted OLEDs, the bottleneck to limit their efficiency and stability is the interface at cathode/EIL and light emitting layer (EML)/charge transporting layer. In this paper, we have investigated the effect of different electron/hole transporting layers on the turn-on voltage, efficiency roll-off and power consumption of inverted orange OLEDs. We found that the device exhibits extremely-low efficiency roll-off and a significant lifetime improvement.

Abstract: This paper deals with a novel polishing technology using polymer particles. It has been proposed and developed by the authors for the purpose of solving the problems associated with polishing pads such as pad deterioration, process inconsistency and poor accuracy. Single side polishing of silicon wafers and double side polishing of quartz crystal square wafers were performed to clarify the basic characteristics of the technology. The results showed that appropriate combination of tool plate with polymer particles could greatly improve polishing characteristics. In particular, the edge profiles can be controlled to have desirable shape as well as amplitudes.