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Solid-State Light-Emitting Devices Based on the Tris-Chelated Ruthenium(II) Complex. 2. Tris(bipyridyl)ruthenium(II) as a High-Brightness Emitter

1999; American Chemical Society; Volume: 121; Issue: 14 Linguagem: Inglês

10.1021/ja984163n

1943-2984

Erik S. Handy, Amlan J. Pal, Michael F. Rubner,

Molecular Junctions and Nanostructures

We report high-brightness, high-efficiency, solid-state light-emitting devices based on small-molecule Ru(bpy)3(PF6)2 and its derivatives. These devices operate at low voltage (as low as 2.5 V), suggesting a close parallel with well-documented liquid electrogenerated chemiluminescence cells. We have realized luminance levels as high as 1000 cd/m2 at only 5 V with spin-cast films and 200 cd/m2 at 3 V. Emitted light is red or red-orange in color. At low voltage, external quantum efficiencies on the order of 1% are attainable. Luminance levels and efficiencies of these magnitudes are unprecedented in solid-state Ru(bpy)32+-based devices. A significant time delay is observed between voltage application and device response, as previously reported. We find that the low-voltage time delay can be circumvented using an initial high-voltage pulse, affording nearly instantaneous high brightness.