Synthesis and Opto-electronic Properties of a Red-Emitting Heteroleptic Platinum Complex
Device fabrication
provide red solid. The red solid was recrystallized in
dichloromethane/hexane to afford red crystal of com-
pound 4 (70 mg, 30.5%). 1H NMR (CDCl3, 400 MHz) δ:
8.72 (d, J=6.4 Hz, 1H), 8.59 (d, J=8.0 Hz, 1H), 8.06
(d, J=6.8 Hz, 1H), 7.94 (d, J=7.2 Hz, 2H), 7.68 (d,
J=6.8 Hz, 2H), 7.50 (d, J=6.8 Hz, 4H), 7.32 (d, J=
6.8 Hz, 2H), 7.06—7.76 (m, 2H), 6.28—6.03 (m, 2H),
1.97 (s, 3H). Anal. calcd for C32H20F3N3O2Pt: C 52.61,
H 2.76, N 5.75; found C 51.98, H 2.52, N 5.78.
The phosphorescent devices using (piq)Pt(mptfbp)
as dopant and a blend of PFO and PBD as a host matrix
were fabricated on a clean ITO glass substrate with a
sheet resistance of 15 Ω/□ (Nanbo, Shengzhen). A
hole-injection layer of poly-3,4-ethylene dioxythio-
phene (PEDOT, 50 nm), a hole-transporting layer of
poly(vinyl-carbazole) (PVK, 50 nm) and an emitting
layer of platinum(II) complex doped into a PFO-PBD
blend (80 nm) were spin-coated on the top of the ITO
substrate successively. Subsequently, barium (4 nm) was
deposited on the top of the emitting layer under vacuum
References
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4
by vacuum deposition. Typical active area of the devices
was 0.15 mm2 in this study. All steps except PEDOT
and PVK-coating were performed in a nitrogen-filled
dry glove box with oxygen and water contents less than
1×106.
Materials
All solvents were carefully dried and distilled prior
to use. Commercially available reagents were used
without further purification unless otherwise stated.
1-Phenylisoquinoline and di(1-phenylisoquinoline)-µ-
chloro platinum(II) (1) and 3-methyl-1-phenyl-5-pyra-
zolone (2) were synthesized according to the literature
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under stirring and dry anhydrous calcium hydroxide (3.0
g) was added. After strong stirring for 20 min,
3,4,5-trifluorobenzoyl chloride (4.4 g, 0.02 mol) was
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J=6.0, 7.2 Hz, 2H), 7.75 (dd, J=8.0, 7.2 Hz, 1H), 7.52
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C2')
(3-methyl-1-phenyl-4-(3,4,5-trifluorobenzoyl)-
1H-pyrazol-5(4H)-one-O,O) (4)
A mixture of the dimer 1 (200 mg, 0.16 mmol),
3-methyl-1-phenyl-4-(3,4,5-trifluorobenzoyl)-1H-pyraz-
ol-5(4H)-one (3) (138 mg, 0.41 mmol), Na2CO3 (140
mg, 1.32 mmol) and 2-ethoxyethanol (20 mL) was
stirred at 100 ℃ for 24 h and distilled to remove the
solvent under vacuum. The residue was purified by flash
chromatography using dichloromethane as an eluent to
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