We fabricate an inverted bottom-emission organic light emitting diode （IBOLED） employing two n-doped layers, i.e., 5 nm lithium carbonate doped PTCDA （1：2 Li2CO3：PTCDA） with 5 nm Li2CO3 doped BCP （1：4 Li2CO3：...We fabricate an inverted bottom-emission organic light emitting diode （IBOLED） employing two n-doped layers, i.e., 5 nm lithium carbonate doped PTCDA （1：2 Li2CO3：PTCDA） with 5 nm Li2CO3 doped BCP （1：4 Li2CO3：BCP） on top, where PTCDA and BCP stand for 3, 4, 9, 10 perylenetetracarboxylic dianhydride and bathcuporine, respectively. Compared to the IBOED using a layer of 10 nm 1：4 Li2CO3：BCP, the one utilizing the two-layer combination of 5 nm 1：2 Li2CO3：PTCDA and 5 nm 1：4 Li2CO3：BCP shows decreasing operation voltage and thereby increasing power efficiency, mainly attributed to the higher electron conductivity of 1：2 Li2CO3：PTCDA than that of 1：4 Li2CO3：BCP. The mechanism of the electron transport through the interface of 1：2 Li2CO3：PTCDA and 1：4 Li2CO3：BCP is also discussed. We provide a simply and effective structure to enhance the current conduction for IBOLEDs.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 50803014.
文摘We fabricate an inverted bottom-emission organic light emitting diode （IBOLED） employing two n-doped layers, i.e., 5 nm lithium carbonate doped PTCDA （1：2 Li2CO3：PTCDA） with 5 nm Li2CO3 doped BCP （1：4 Li2CO3：BCP） on top, where PTCDA and BCP stand for 3, 4, 9, 10 perylenetetracarboxylic dianhydride and bathcuporine, respectively. Compared to the IBOED using a layer of 10 nm 1：4 Li2CO3：BCP, the one utilizing the two-layer combination of 5 nm 1：2 Li2CO3：PTCDA and 5 nm 1：4 Li2CO3：BCP shows decreasing operation voltage and thereby increasing power efficiency, mainly attributed to the higher electron conductivity of 1：2 Li2CO3：PTCDA than that of 1：4 Li2CO3：BCP. The mechanism of the electron transport through the interface of 1：2 Li2CO3：PTCDA and 1：4 Li2CO3：BCP is also discussed. We provide a simply and effective structure to enhance the current conduction for IBOLEDs.
