Different energy transfer behaviors of poly (9-vinylcabazole) and polyfluorene derivative thin films upon doping with triplet emitters

作者：Chang J^*; An J; Im C; Kim YK

来源：Journal of the Korean Physical Society, 2005, 47(6): 1028-1034.

• pi-conjugated polymer
• OLED
• photoluminescence
• phosphorescence
• triplet doping

To understand the exact phosphorescent dopant-induced photoluminescence (PL) properties of photoactive thin films consisting of a pi-conjugated polymer matrix and a triplet dopant, we prepared two types of polymer, poly(9-vinylcarbazole) (PVK) and poly [9,9-bis (2-ethylhexyl) fluorene2,7-diyll (PF2/6) doped with triplet emitters for organic light-emitting diodes (OLED), either iridium (III) fac-tris(2-phenylpyridine) (Ir(PPY)(3)) or iridium(III)bis[(4,6-fluorophenyl)-pyridinato-N, C(2)']picolinate (FIrpic), as thin films by using the conventional spin coating method. Those doped films, as well as pristine films, on quartz substrates were characterized by means of UV-Vis absorption, and PL and PL excitation (PLE) spectroscopy for a wide spectral range. To verify the precise effects upon the doping, we prepared and characterized dilute solution samples in order to compare them with the solid samples. We found that the facility of exciton migration from the matrix to the dopant and the subsequent triplet emission were significantly pronounced in the PVK-based blended systems. At the same time, the PF2/6 blended systems showed an efficient PL quenching upon doping, although the PL maxima of the PVK and the PF2/6 as thin films were virtually identical.

• 出版日期2005-12