Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1442531 | Synthetic Metals | 2010 | 6 Pages |
Abstract
We fabricated molecularly doped, polymer-based light-emitting diodes possessing a single emitting layer containing a hole-transporting host polymer poly(N-vinylcarbazole) and an electron-transporting auxiliary, 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole, doped with novel phosphorescent cyclometalated Pt(II) complexes bearing arylpyridine and 1,3-diketone ligands. These novel cyclometalated Pt(II) complexes emit pure red color both in steady-state emissions (poly(methyl methacrylate) films)) and electrophosphorescence. They exhibited pure red emissions with the Commission Internationale de l'Eclairage coordinates (XÂ =Â â¼0.67, YÂ =Â â¼0.33), which is almost identical to the coordinates of standard red (0.66, 0.34) demanded by the National Television System Committee. The color coordinates remained unchanged over a range of operating voltages, even at luminances greater than 1Â ÃÂ 104Â cd/m2. The maximum external quantum efficiency of these devices exceeded 3.6% and the maximum brightness was greater than 1Â ÃÂ 104Â cd/m2.
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Authors
Hidetaka Tsujimoto, Yoshiaki Sakurai, Shigeyuki Yagi, Yuichiro Honda, Hotaka Asuka, Hiroto Terao, Takeshi Maeda, Hiroyuki Nakazumi,