Synthesis, Characterization and Optical Properties Based on a Novel Re(I) Emitter with Bulky Building Block

Abstract:

A novel rhenium complex material, i.e., Re-APPP, (APPP, 2,3-acenaphtho[1,2-b]pyrazino [2,3-f][1,10]phenanthroline) was designed, synthesized in five steps from commercially available starting materials and characterized by FTIR, ¹H NMR and mass spectroscopy. The photophysical properties of this complex were studied. The absorption bands centered at ca. 326, 366 and 450nm of Re-APPP were attributed to the ligand-centered p→p* transition and the metal-to-ligand charge transfer dπ(Re)→π*(APPP) transition, respectively. Re-APPP was thermally stable with high decomposition temperature of 302°C. The organic light-emitting diodes using Re-APPP as a dopant emitter with the structures of ITO/m-MTDATA(10nm)/NPB(20nm)/CBP: Re-APPP(30nm)/BCP(10nm)/Alq₃(30nm)/LiF(1nm)/Al(100nm) were fabricated and a broad electroluminescent peak at 550nm was observed. More importantly, the devices exhibited very small efficiency roll-off of only ca.45% which was probably attributed to its short luminescent lifetime.

• Periodical: Advanced Materials Research (Volumes 295-297)
• Pages: 373-377
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.295-297.373
• Online since: July 2011
• Authors: Tie Nan Zang, Xiao Li, Lian Shui Yu, Ji Ping Ru, Hai Jun Chi, Guo Yong Xiao, Zhi Zhi Hu
• Keywords: Luminescence, OLEDs, Optical Material, Rhenium Complex, Synthesis

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