title: Sensitive triplet exciton detection in polyfluorene using Pd-coordinated porphyrin.
abstract: We developed a sensitive spectroscopic method to probe triplet concentration in thin films of polyfluorene (PF) at room temperature. The energy of photoexcited triplet excitons is transferred to the guest metal-organic complex, meso-tetratolylporphyrin-Pd (PdTPP), and detected as phosphorescent emission. The phosphorescence intensity of PdTPP-PF blends is proportional to the independently measured triplet concentration using photoinduced absorption experiments. The high sensitivity of this method allows room temperature detection of triplet excitons in spin-coated polymer films as thin as 10 nm. We found that the triplet lifetime is independent of PdTPP concentration and therefore this method is nearly non-perturbing for the triplet population.
authors: Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands. alex@mikhnenko.com
authors: Oleksandr V
authors: OV
authors: Mikhnenko
authors: Paul W M
authors: PW
authors: Blom
authors: Maria Antonietta
authors: MA
authors: Loi
mesh_terms: D005449:Fluorenes / Q000737:chemistry*; D008567:Membranes, Artificial; D008665:Metalloporphyrins / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013876:Thiophenes
chemical_list: D005449:Fluorenes; D008567:Membranes, Artificial; D008665:Metalloporphyrins; D011108:Polymers; D013876:Thiophenes; C528647:poly(9,9-dioctylfluorene-co-3,4-di-methylthieno(2,3-b)thiophene); D010165:Palladium