Synthesis, aggregation-induced emission and thermally activated delayed fluorescence properties of two new compounds based on phenylethene, carbazole and 9,9′,10,10′-tetraoxidethianthrene

In the text, two luminescent materials ECPPTT and ECDPTT, have been designed and synthesized by integrating tetraphenyl/triphenyl-ethene(TPEJTrPE), carbazole group and thianthrene-9,9,10,10-tetraoxide unit. ECPPTT and ECDPTT possess obvious AIE and TADF capabilities, and show good thermal stability in their thin film of 240 degrees C and 262 degrees C, respectively. Non-doped organic light emitting diodes(OLED) using ECPPTT and ECDPTT as emission layer are prepared and exhibit blue-green and green emission color with peaks at 494, 517 nm, respectively. The non-doped OLED based on ECPPTT provides good peak EL efficiencies of 3.437 cdA(-1) and 10090cdm(-2); while non-doped OLED fabricated with ECDPTT affords a maximum current efficiency and a maximum luminance of 2.478 cdA(-1) and 7561cdm(-2). These results have demonstrated the feasibility of combing AIE and TADF units to design new molecules. (C) 2017 Elsevier Ltd. All rights reserved.