Novel efficient blue materials with 4H-cyclopenta[def]phenanthrene for OLEDs

Add time:09/28/2019    Source:infona.pl

Novel blue emitters, 2-[10-(4,4-dioctyl-4H-CYCLOPENTA[DEF]PHENANTHRENE (cas 203-64-5)-2-yl)-9-anthryl]-4,4-dioctyl-4H-cyclopenta[def]phenanthrene (OCPA) and 4,4,4′,4′,4″,4″-hexaoctyl-2,6′:2′,6″-tercyclopenta[def]phenanthrene (TerCPP) have been synthesized and characterized. The introduction of cyclopenta[def]phenanthrene units into the structure of OCPA and TerCPP leads LEDs with high efficiency and pure blue emission. Thermal analysis of OCPA and TerCPP reveals their high thermal stability. Their decomposition temperatures are around 410°C for OCPA and 425°C for TerCPP. The high-quality amorphous films of OCPA and TerCPP were prepared by vapor deposition. UV–visible absorption spectra of the thin films of these compounds appear at about 303–400nm, and their maximum PL emission appeared at about 434 and 401nm, respectively. The multi-layered OLEDs with the configuration of ITO/with or without PEDOT:PSS/NPD/OCPA or TerCPP/BAlq or BCP/Alq 3 /LiF/Al were fabricated to investigate the electroluminescent properties and the current–voltage–luminescence characteristics of the compounds. Multi-layer organic EL devices with OCPA and TerCPP as an emitting layer produced bright blue (434nm) and sky blue emissions (440nm), respectively. The device of OCPA with the configuration of ITO/NPD/OCPA/BAlq/Alq 3 /LiF/Al showed the turn-on voltage of about 5.6V, the maximum brightness of 2500cd/m 2 (at 11V), the maximum luminescence efficiency of 1.2cd/A, and CIE coordinates of 0.16 and 0.12 which are quite close to that of the National Television System Committee (NTSC) standard blue (0.14, 0.08).

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