论文部分内容阅读
有机电致发光器件的稳定性是其实用化面临的主要难题之一。为了研究有机/有机界面性质对有机电致发光器件稳定性的影响,采用溶液旋涂的NPB(NPBSC)作为器件的空穴传输层制备了两种异质结电致发光器件:ITO/NPBSC/Alq3/LiF/Al和ITO/NPBSC/NPB/Alq3/LiF/Al,对比研究了器件的发光性能和工作稳定性。研究结果表明:完全使用NPBSC作为空穴传输层的器件性能和稳定性都较差,这归因于不稳定的NPBSC/Alq3界面,在空气中旋涂制备NPB层时,空气中的水蒸气和氧气分子会粘附在空穴传输层表面,这样就会引起界面处Alq3分子的发光猝灭。插入10 nm真空蒸镀的NPB层可以显著地提高器件的发光性能和稳定性,10 nm的NPB层把污染界面与激子复合区界面分开,避免了水蒸气和氧气分子对Alq3分子的发光猝灭,器件的效率增加了1.15 cd/A,半衰期寿命提高了4倍。
The stability of organic electroluminescent devices is one of the major challenges in practical use. In order to study the effect of the organic / organic interface on the stability of organic electroluminescent devices, two kinds of heterojunction electroluminescent devices were prepared by solution spin-on NPB (NPBSC) as the hole transport layer: ITO / NPBSC / Alq3 / LiF / Al and ITO / NPBSC / NPB / Alq3 / LiF / Al were used to investigate the luminescent properties and work stability of the device. The results show that the performance and stability of NPBSC as a hole-transport layer are poor due to the unstable NPBSC / Alq3 interface. When the air-borne NPB layer is spin-coated, the water vapor and Oxygen molecules will adhere to the hole transport layer surface, which will cause the interface of Alq3 molecular emission quenching. The insertion of 10 nm vacuum-evaporated NPB layer can significantly improve the luminescent properties and stability of the device. The 10 nm NPB layer separates the contaminated interface from the exciton recombination interface and avoids the luminescence quenching of Alq3 molecules by water vapor and oxygen molecules Off, the device efficiency increased by 1.15 cd / A, half-life increased by 4 times.