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采用双发光层双主体结构,制备了高效稳定的白光有机电致发光器件(WOLED)。其中蓝光层是TBADN:3 wt%DSA-Ph,红光层是[TBADN:Alq3]:1 wt%DCJTB,通过改变红光层中Alq3和TBADN的掺杂比来调节器件的发光效率和颜色。当[TBADN:Alq3]为75∶25时获得了效率最高、色度好和性能稳定的白光,在20 mA/cm2时器件的发光效率为6.27 cd/A,CIE色坐标为(0.364,0.348)。当电流密度为200 mA/cm2时,发光效率仍能保持在6.15 cd/A,色度坐标为(0.344,0.344)。由于在[TBADN:Alq3]双主体结构中,TBADN具有双极性,从而改善了器件中载流子的平衡及其在发光层中的分布,进而提高的器件的性能。
Double light-emitting layer dual-host structure is used to prepare a highly efficient and stable white light organic electroluminescent device (WOLED). The blue light is TBADN: 3 wt% DSA-Ph and the red light is [TBADN: Alq3]: 1 wt% DCJTB. The luminescence efficiency and color of the device are adjusted by changing the doping ratio of Alq3 and TBADN in the red layer. When [TBADN: Alq3] was 75:25, the highest efficiency, good chromaticity and stable white light were obtained. The luminous efficiency of the device was 6.27 cd / A at 20 mA / cm2, and the CIE color coordinates were (0.364,0.348) . When the current density is 200 mA / cm2, the luminous efficiency can still be maintained at 6.15 cd / A, with chromaticity coordinates of (0.344,0.344). Due to the bipolar nature of TBADN in [TBADN: Alq3] dual host structure, the balance of carriers in the device and its distribution in the light-emitting layer are improved, thereby improving the performance of the device.