Poly( m -phenylene): Conjugated Polymer Host with High Triplet Energy for Efficient Blue Electrophosphorescence
2010; American Chemical Society; Volume: 43; Issue: 23 Linguagem: Inglês
10.1021/ma102091g
ISSN1520-5835
Autores Tópico(s)Organic Electronics and Photovoltaics
ResumoA poly(m-phenylene) derivative tethering carbazole unit (PmPCz) is reported to have a triplet energy level (ET) as high as 2.64 eV, sufficient to host blue electrophosphorescence. To our best knowledge, this is the first conjugated polymer with ET higher than that of state-of-the-art blue phosphorescent dopant, iridium(III) bis(4,6-(difluorophenyl)pyridinato-N,C2)picolinate (FIrpic). PmPCz exhibits good thermal stability and excellent miscibility with the blue phosphorescent dopant, FIrpic. Owing to the high ET and good miscibility, blends of PmPCz with FIrpic show no triplet energy back-transfer and exhibit emission exclusively from FIrpic, even at FIrpic concentration as low as 1 wt %. Single-layer blue phosphorescent polymer light-emitting diode based on the blend exhibits a luminance efficiency of 4.69 cd/A.
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