16 Luminescent Materials for Organic Light-Emitting Diodes
579
Fig. 16.17 Structures of blue phosphorescent bis- and tris-cyclometalated iridium(III) complexes
of 0.89 in solution (Endo et al. 2008). In this complex, pic is more effective than OˆO
such as acac to obtain blue-shifted emission: the PL maximum of Ir(dfppy) 2 (acac)
is ca. 20 nm red-shifted in comparison with that of FIrpic (Adachi et al. 2001b).
The tris-cyclometalated complex fac-Ir(dfppy) 3 also exhibit sky blue emission at
467 nm with Φ PL of 0.97 (Endo et al. 2008), and thus the fluorinated ppy is a
practical cyclometalated ligand. Replacement of the ancillary ligand of FIrpic with
tetrakis(1-pyrazolyl)borate (tpzb) leads to further blue-shifted emission:
Ir(dfppy) 2 (tpzb) (or FIr6) exhibits efficient blue emission at 458 nm with Φ PL of 0.96
(Endo et al. 2008). Aimed at development of blue phosphorescent organoiridium(III)
579
Fig. 16.17 Structures of blue phosphorescent bis- and tris-cyclometalated iridium(III) complexes
of 0.89 in solution (Endo et al. 2008). In this complex, pic is more effective than OˆO
such as acac to obtain blue-shifted emission: the PL maximum of Ir(dfppy) 2 (acac)
is ca. 20 nm red-shifted in comparison with that of FIrpic (Adachi et al. 2001b).
The tris-cyclometalated complex fac-Ir(dfppy) 3 also exhibit sky blue emission at
467 nm with Φ PL of 0.97 (Endo et al. 2008), and thus the fluorinated ppy is a
practical cyclometalated ligand. Replacement of the ancillary ligand of FIrpic with
tetrakis(1-pyrazolyl)borate (tpzb) leads to further blue-shifted emission:
Ir(dfppy) 2 (tpzb) (or FIr6) exhibits efficient blue emission at 458 nm with Φ PL of 0.96
(Endo et al. 2008). Aimed at development of blue phosphorescent organoiridium(III)