Tetraaryldiamine derivatives of formula (1) are used in organic EL elements.
R1, R2, R3, and R4 represent aryl, alkyl, alkoxy, aryloxy, amino or halogen, at least one of R1 to R4 is an aryl group, r1, r2, r3, and r4 are 0 or an integer of 1 to 5, the sum of r1 to r4 is at least 1, R5 and R6 represent alkyl, alkoxy, amino or halogen, r5 and r6 are 0 or an integer of 1 to 4. The inventive compounds have high m.p. and high Tg and can be evaporated to deposit transparent smooth thin films of quality which maintain a stable amorphous state above room temperature over a long term. Organic EL elements using the inventive compounds in an organic compound layer, typically a hole injecting and transporting layer thereof provide uniform plane light emission and maintain a high intensity of luminescence in a stable manner over a long term. Thus the elements are fully durable and reliable.
公式(1)的四芳基二胺衍
生物被用于有机EL元件中。R1、R2、R3和R4代表芳基、烷基、烷氧基、芳氧基、
氨基或卤素,其中至少一个是芳基基团,r1、r2、r3和r4为0或1至5的整数,r1到r4的总和至少为1,R5和R6代表烷基、烷氧基、
氨基或卤素,r5和r6为0或1至4的整数。这些创新化合物具有高熔点和高Tg值,可以蒸发沉积成质量优良的透明平滑薄膜,在室温以上的长期稳定非晶态。在有机化合物层中使用这些创新化合物的有机EL元件,通常是其孔注入和传输层,提供均匀的平面光发射,并在长期稳定的情况下保持高亮度的荧光。因此,这些元件具有完全耐用和可靠的特点。