论文部分内容阅读
采用旋涂的方法制备了(3,4-亚乙二氧基噻吩):聚(苯乙烯磺酸)(PEDOT:PSS)薄膜,结合液晶衬垫(LCS,liquid crystal spacer)对OLED进行光萃取,制备了结构为Glass/ITO/PEDOT:PSS/LCS/NPB(40nm)/Alq3(40nm)/LiF(1nm)/Al(100nm)的OLED以及其相应的对比器件。通过测量其电压、电流、亮度、色坐标和电致发光(EL)光谱等参数,研究了LCS对OLED发光性能的影响。结果表明,当引入LCS后,OLED在电压为11V时,最大电流效率达6.15cd/A,比不加LCS的器件提高了40%;且在电压从7V上升到12V的过程中,器件的色坐标仅从(0.31,0.57)变化到(0.31,0.56)。究其原因,LCS的引入可以提高透过率,破坏器件内部光的折射以及全反射条件,并使功能层形成褶皱结构,使更多的光子能够从器件内发射,也增大了电极的表面积,使电流密度增加,注入的能量提高。
(3,4-ethylenedioxythiophene): poly (styrenesulfonic acid) (PEDOT: PSS) thin film was prepared by spin-coating, and the OLED was extracted by liquid crystal spacer (LCS) An OLED with a structure of Glass / ITO / PEDOT: PSS / LCS / NPB (40 nm) / Alq3 (40 nm) / LiF (1 nm) / Al (100 nm) was prepared with its corresponding comparative device. The effects of LCS on the luminescent properties of OLEDs were investigated by measuring parameters such as voltage, current, brightness, color coordinates and electroluminescence (EL) spectra. The results show that when LCS is introduced, the maximum current efficiency of OLED is 6.15 cd / A at the voltage of 11V, which is 40% higher than that of the device without LCS. In the process of voltage rising from 7V to 12V, The coordinates change only from (0.31, 0.57) to (0.31, 0.56). The reason is that the introduction of LCS can improve the transmittance, undermine the refraction and total internal reflection conditions of the device, and make the functional layer to form the wrinkle structure, allowing more photons to be emitted from the device and also increasing the surface area of the electrode , So that the current density increases, the injected energy increased.