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首页> 外文期刊>Synthetic Metals >Improved electron injection in organic LED with lithium quinolate/aluminium cathode
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Improved electron injection in organic LED with lithium quinolate/aluminium cathode

机译：使用喹啉锂/铝阴极改善有机LED中的电子注入

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摘要

Lithium quinolate (Liq), covered with aluminium, was used as an electron injection layer in a double layer organic light emitting diode consisting of NPD as the hole transport layer and Alq as the emitting layer resulting in lower turn on voltage and increased power efficiency. The driving voltage required to achieve a luminance of 100 cd/m~2 decreased from 5.8 V for the Ca/Al to 4.2 V when Liq/Al was used, Improving device power efficiency from 2.3 to 4.1 lm/W. The performance tolerance to layer thickness of Liq devices is also better than that of the devices with lithium fluoride (LiF). Due to the highly insulating nature of LiF, it can only be used when deposited as an ultra-thin layer, while the Liq can be deposited into layers as thick as 5 nm without significantly affecting the EL properties. An Liq electron injecting layer has also been tried in combination with Ca, Mg and Ag cathodes. Our experiments support the assumption that free lithium is released from lithium quinolate, as in the case of lithium fluoride, when Liq is over coated with active metals such as Al.
机译：覆盖有铝的喹啉锂（Liq）用作双层有机发光二极管中的电子注入层，该双层有机发光二极管由NPD作为空穴传输层，而Alq作为发光层，导致较低的开启电压和更高的功率效率。当使用Liq / Al时，实现100 cd / m〜2的亮度所需的驱动电压从Ca / Al的5.8 V降至4.2 V，从而将器件的功率效率从2.3 lm / W提升至4.1 lm / W。 Liq器件对层厚度的性能公差也优于氟化锂（LiF）器件。由于LiF的高度绝缘性，它只能在沉积为超薄层时使用，而Liq可以沉积到厚达5 nm的层中，而不会显着影响EL性能。还尝试过将Liq电子注入层与Ca，Mg和Ag阴极结合使用。我们的实验支持以下假设：当Liq覆盖有活性金属（如Al）时，就可以从喹啉酸锂中释放出游离锂，就像氟化锂一样。

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