High luminance/efficiency monochrome and white organic light emitting diodes based pure exciplex emission

In this work, high luminance and high efficiency monochrome and white organic light emitting diodes (OLED) based pure exciplex emission were realized by the application of spacer. First, monochrome exicplex OLED based blue (26DCzPPy:PO-T2T) and yellow (DMAC-MPM:PO-T2T) emission were studied. Then the pure exciplex WOLED based blue and yellow exciplex complementary colors were designed with three spacer materials of DMAC-MPM, 26DCzPPy and DPEPO, respectively. At last, orange exciplex of TAPC:PO-T2T was applied to replace DMAC-MPM:PO-T2T with 26DCzPPy as spacer to construct pure exciplex WOLED. As results, all the pure exciplex WOLED of W1∼W4 achieved a high maximum luminance of ∼10000 cd m−2, current efficiency of ∼20 cd A−1, power efficiency of ∼20 lm W−1 and external quantum efficiency of ∼8%, respectively. As far as we know from literature review, our WOLED with the maximum luminance and efficiency were one of the best among the pure exciplex emission WOLED. The high performances were derived from the high efficiency monochrome exciplex and spacer selection and application.