A diamond-like carbon (DLC) film is deposited as an electron injection layer between the polymer light-emitting layer(MEH-PPV) and aluminum (Al) cathode electrode in polymer electroluminescence devices (PLEDs)...A diamond-like carbon (DLC) film is deposited as an electron injection layer between the polymer light-emitting layer(MEH-PPV) and aluminum (Al) cathode electrode in polymer electroluminescence devices (PLEDs) using a radio frequency plasma deposition system. The source material of the DLC is n-butylamine. The devices consist of indium tin oxide (ITO)/MEH-PPV/DLC/Al. Electron injection properties are investigated through I-V characteristics,and the mechanism of electron injection enhancement due to a thin DLC layer has been studied. It is found that: (1) a DLC layer thinner than 1.0nm leads to a higher turn-on voltage and decreased electroluminescent (EL) efficiency; (2) a 5.0nm DLC layer significantly enhances the electron injection and results in the lowest turn-on voltage and the highest EL efficiency; (3) DLC layer that exceeds 5.0nm results in poor device performance;and(4) EL emission can hardly be detected when the layer exceeds 10.0nm. The properties of ITO/MEH-PPV/DLC/Al and ITO/MEH-PPV/LiF/Al are investigated comparatively.展开更多
电力电子技术的发展,尤其是其中关银器件GTO(可关断晶闸管)、LTT(光控晶闸管)及IEGT(电子注入增强门板晶体管)向高电压、大功率方向的迅速发展,出现了一类为适应电力系统向远距离大容量输电而需要对其参数实施快速控制的大功率电力...电力电子技术的发展,尤其是其中关银器件GTO(可关断晶闸管)、LTT(光控晶闸管)及IEGT(电子注入增强门板晶体管)向高电压、大功率方向的迅速发展,出现了一类为适应电力系统向远距离大容量输电而需要对其参数实施快速控制的大功率电力电子设备——柔性交流传输设备(Flexible AC Transmission Systems),国际简称为FACTS,国内有的翻译为柔性交流输电技术,还有翻译为灵活交流输电系统,尽管其中的静止无功补偿器(SVC)早已出现,但FACTS更广阔的含义最先是由美国电力研究院(EPRI)提出的,它可使输电线路上的负荷接近其内部热极限功率,并能快速响应瞬时扰动,改善整个系统的稳定性。展开更多
文摘A diamond-like carbon (DLC) film is deposited as an electron injection layer between the polymer light-emitting layer(MEH-PPV) and aluminum (Al) cathode electrode in polymer electroluminescence devices (PLEDs) using a radio frequency plasma deposition system. The source material of the DLC is n-butylamine. The devices consist of indium tin oxide (ITO)/MEH-PPV/DLC/Al. Electron injection properties are investigated through I-V characteristics,and the mechanism of electron injection enhancement due to a thin DLC layer has been studied. It is found that: (1) a DLC layer thinner than 1.0nm leads to a higher turn-on voltage and decreased electroluminescent (EL) efficiency; (2) a 5.0nm DLC layer significantly enhances the electron injection and results in the lowest turn-on voltage and the highest EL efficiency; (3) DLC layer that exceeds 5.0nm results in poor device performance;and(4) EL emission can hardly be detected when the layer exceeds 10.0nm. The properties of ITO/MEH-PPV/DLC/Al and ITO/MEH-PPV/LiF/Al are investigated comparatively.
文摘电力电子技术的发展,尤其是其中关银器件GTO(可关断晶闸管)、LTT(光控晶闸管)及IEGT(电子注入增强门板晶体管)向高电压、大功率方向的迅速发展,出现了一类为适应电力系统向远距离大容量输电而需要对其参数实施快速控制的大功率电力电子设备——柔性交流传输设备(Flexible AC Transmission Systems),国际简称为FACTS,国内有的翻译为柔性交流输电技术,还有翻译为灵活交流输电系统,尽管其中的静止无功补偿器(SVC)早已出现,但FACTS更广阔的含义最先是由美国电力研究院(EPRI)提出的,它可使输电线路上的负荷接近其内部热极限功率,并能快速响应瞬时扰动,改善整个系统的稳定性。