Oxadiazole-carbazole polymer (POC)-Ir(ppy)3 tunable emitting composites

• Published in: Optical materials 2017-04, Vol.66, p.166-170
• Main Authors: Bruno, Annalisa, Borriello, Carmela, Di Luccio, Tiziana, Sessa, Lucia, Concilio, Simona, Haque, Saif A., Minarini, Carla
• Format: Article
• Language: English
• Subjects: OLED; Polymers; Time resolved fluorescence; White emission
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2016.12.039

POC polymer is an oxadiazole-carbazole copolymer we have previously synthetized and established as light emitting material in Organic Light Emitting Devices (OLEDs), although POC quantum yield emission efficiency and color purity still need to be enhanced. On the other hand, tris[2-phenylpyridinato-C2,N]iridium(III) (Ir(ppy)3) complexes, namely Ir(ppy)3 are among the brightest luminophores employed in green light emitting devices. Our aim, in this work, is to take advantage of Ir(ppy)3 bright emission by combining the Ir complex with blue emitting POC to obtain tunable light emitting composites over a wide range of the visible spectrum. Here we have investigated the optical proprieties POC based nanocomposites with different concentrations of Ir(ppy)3, ranging from 1 to 10 wt%. Both spectral and time resolved fluorescence measurements show an efficient energy transfer from the polymer to the dopants, resulting in white-emitting composites. The most intense and stable emission has been found when POC was doped with about 5 wt% concentration of Ir(ppy)3. •POC-Ir(ppy)3 composites: oxadiazole-carbazole copolymer and green emissive Iridium complex.•Tunable and efficient broadband emissive active layer in Organic Light Emitting Diodes (OLEDs).•POC-Ir(ppy)3 composites energetic compatibility and optical properties have been investigated.