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In this work, we proposed that indium-tin-oxide (ITO)-free, which is the most generally used to a transparent electrode for light applications and displays, semitransparent Ni/Ag/Ni electrode could be applied in flexible blue phosphorescent organic light-emitting diodes (OLEDs). Although the highest electrical characteristics values, such as luminance efficiency and external quantum efficiency, using...
High substrate warpage can lead to unacceptable yield loss during chip attach in assembly, and cause high yield fallout during package mount on the circuit board. For the first time, through this work, the electrolytic copper (Cu) plating process in substrate manufacturing was shown to contribute significantly to package warpage. For a 14×14mm package, reducing the Cu plating rate (within the manufacturing...
A metal–semiconductor–metal (MSM) photodetector is fabricated on a thin polysilicon membrane embedded in a silicon-based wafer-level package for light-emitting diodes (LEDs) to accurately sense the brightness of a mounted LED. A thin polysilicon membrane, which is slightly askew above the LED chip, was made reproducibly and uniformly on a silicon substrate. In the membrane, an MSM photodetector having...
We have demonstrated high-efficiency and color stable deep-blue organic light emitting diodes (OLED) using 4,4'-bis (9-ethyl-3-carbazovinylene)-1,1' -biphenyl doped in new blue host material as emitting layer. As host change of the doped blue emitter, blue OLED improved efficiency and exhibited color stability. The optimized blue OLED showed the peak external quantum efficiency of 4.72%, luminous...
In silicon integrated circuit technology, ferroelectric thin films have been importantly studied since they are the most promising materials for future non-volatile memory devices due to their fast switching speed and long-term retention time. PbTiO3 (PTO) is the one of the most suitable material for non-volatile memory devices, because it has the highest spontaneous polarization (PS) value. The subject...
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