A Newly Designed Polyfluorene as an Efficient Host Material for Phosphorescent-Dye-Doped Polymer Light-Emitting Diodes

作者：Ha Soo Hyun^*; Noh Yong Young

来源：Japanese Journal of Applied Physics, 2013, 52(10): UNSP 10MB11.

DOI：10.7567/JJAP.52.10MB11

A newly designed polyfluorene derivative, poly[2,7-(9,9-bis(5-cyanopentyl fluorene)-co-alt)-2,5-dimethyl-phenylene] (CNPFX), was synthesized for use as a host material for a phosphorescent dye, fac-tris(2-phenylpyridine) [Ir(ppy)(3)], in phosphorescent polymer light-emitting diodes. Efficient energy transfer to Ir(ppy)(3) was achieved as a result of improved chemical compatibility via introduction of a polar unit, as well as increased spectrum overlap due to a blue-shift in the emission spectrum. Photo-and electro-luminescent spectra of Ir(ppy)(3)-doped CNPFX film showed clear green emission from Ir(ppy)(3) due to efficient energy transfer, whereas those of Ir(ppy)(3)-doped poly(9,9-dihexylfluorene) (PF6) film showed blue emission from PF6. The CNPFX:Ir(ppy)(3) (8 wt%) single layer device showed significantly improved performance.

• 出版日期2013-10