2004
DOI: 10.1246/bcsj.77.751
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A Synthesis and Luminescence Study of Ir(ppz)3 for Organic Light-Emitting Devices

Abstract: Tris(1-phenyl-κC1-pyrazolato-κN2)iridium (Ir(ppz)3) was prepared and its luminescence properties were investigated for the application to organic light-emitting devices (OLEDs). The photoluminescence (PL) spectra of Ir(ppz)3 in dichloromethane showed a peak at 437 nm at room temperature. The luminescent lifetime of an Ir(ppz)3 film doped in CBP was found to be 218 ns, which indicated that its emission is phosphorescent. OLEDs were fabricated with doped films of Ir(ppz)3 in several hosts, and the electrolumines… Show more

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Cited by 33 publications
(9 citation statements)
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“…OLED device composed of mer-Ir(ppy) 3 gave equivalent efficiency as a device of fac-isomer [37]. Actually, radiative rate constants of the mer-isomers are almost identical with those of the corresponding fac-isomer, this is quite reasonable considering that molecular motion and structural transformation are prohibited in the solid state device.…”
Section: Meridional and Facial Isomers Of Iridium Complexes And Theirmentioning
confidence: 66%
“…OLED device composed of mer-Ir(ppy) 3 gave equivalent efficiency as a device of fac-isomer [37]. Actually, radiative rate constants of the mer-isomers are almost identical with those of the corresponding fac-isomer, this is quite reasonable considering that molecular motion and structural transformation are prohibited in the solid state device.…”
Section: Meridional and Facial Isomers Of Iridium Complexes And Theirmentioning
confidence: 66%
“…The emission energy of fac -Ir(ppz) 3 ( λ max = 414 nm, 77 K) is signifi cantly greater than that of fac -Ir(ppy) 3 [121] is much higher than that of ppyH (vida supra). Unfortunately, no detectable emission from fac -Ir(ppz) 3 is observed at room temperature, in fl uid or solid solutions [57,122] . The intensity of photoluminescence of fac -Ir(ppz) 3 is strongly temperature dependent, whereas the PL intensity of fac -Ir(ppy) 3 is invariant with temperature when dispersed in a solid matrix (at temperatures between roughly 100 K and 300 K) [33] .…”
Section: Near -Uv Luminescent Cyclometallated Complexesmentioning
confidence: 99%
“…1 μs) for these dopants to be of practical use, and the phosphorescence quantum yields are often high (≥0.5). The properties of the electronic structure that are responsible for these attributes are of great practical interest. The photophysics of the lowest triplet level have been investigated at the level of structure−activity relationships ,, for numerous Ir(III) and Pt(II) complexes; and finer details, such as properties of the three individual sublevels, have been investigated for several complexes. The controlling features are thought to be the 5d transition metal and the occurrence of a singlet metal-to-ligand charge-transfer (MLCT) state, close in energy, to the emitting triplet state. Quantum-chemical computations find that the lowest excited states are singlets and triplets with variable degrees of MLCT and ligand-centered character.…”
Section: Introductionmentioning
confidence: 99%