The performance of polymer light emitting devices(PLEDs)based on polyvinyl carbazole(PVK)is improved by introducing a nanoscale interfacial thin layer,made of poly(ethylene oxide)(PEO),between the calcium cathode and ...The performance of polymer light emitting devices(PLEDs)based on polyvinyl carbazole(PVK)is improved by introducing a nanoscale interfacial thin layer,made of poly(ethylene oxide)(PEO),between the calcium cathode and the PVK emissive layer.It is believed that the PEO layer plays a key role in enhancing the device performance.In comparison to the device with Ca/Al as the cathode,the performance of the PLED with PEO/Ca/Al cathode,including the driving voltage,luminance efficiency is significantly improved.These improvements are attributed to the introduction of a thin layer of PEO that can lower the interfacial barrier and facilitate electron injection.展开更多
文摘为确定二类油层的注入参数,根据室内物理模拟实验、数值模拟和现场资料分析,研究了二类油层的注聚对象.引入聚驱控制程度概念,进行了二类油层注聚先导性矿场试验.研究结果表明:在注入中等相对分子质量聚合物条件下,二类油层主要注聚对象是有效渗透率大于0.1μm2的油层;在确定具体区块的聚合物相对分子质量时,必须综合考虑不同相对分子质量聚合物对聚驱控制程度和溶液黏度的影响;二类油层聚驱是可行的,但二类油层注聚应严格限制注聚对象,减少层间差异,合理匹配聚合物相对分子质量;二类油层聚驱合理注采井距为175 m.
基金the Office of R&D,National Cheng Kung University,Taiwan
文摘The performance of polymer light emitting devices(PLEDs)based on polyvinyl carbazole(PVK)is improved by introducing a nanoscale interfacial thin layer,made of poly(ethylene oxide)(PEO),between the calcium cathode and the PVK emissive layer.It is believed that the PEO layer plays a key role in enhancing the device performance.In comparison to the device with Ca/Al as the cathode,the performance of the PLED with PEO/Ca/Al cathode,including the driving voltage,luminance efficiency is significantly improved.These improvements are attributed to the introduction of a thin layer of PEO that can lower the interfacial barrier and facilitate electron injection.
