Blue and blue-green PhOLEDs prepared with neutral heteroleptic iridium(III) complexes comprising substituted pyridine-1,2,4-triazoles as the ancillary ligands

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• 作者：Fr茅d茅ric Dumur ; Marc Lepeltier ; Bernadette Graff ; Emmanuel Contal ; Guillaume Wantz ; Jacques Lalev茅e ; C茅dric R. Mayer ; Denis Bertin ; Didier Gigmes
• 关键词：Iridium complex ; Phosphorescence ; Electroluminescence ; Triazole ; OLED ; Triplet state ; Blue emission
• 刊名：Synthetic Metals
• 出版年：1 October, 2013
• 年：2013
• 卷：182
• 期：Complete
• 页码：13-21
• 全文大小：2759 K

文摘

Two neutral heteroleptic iridium(III) complexes bearing substituted pyridine 1,2,4-triazoles as the ancillary ligands have been designed and investigated as emitters for PhOLEDs. Interestingly, blue and blue-green devices were obtained with the two complexes. Best devices were obtained with C₁ and reached a maximum brightness of 10,200 cd/m², a current efficiency of 4.3 cd/A at an operation voltage of 7.9 V while exhibiting the unusual low turn-on voltage of only 2.8 V. UV-visible absorption and photoluminescence spectroscopy as well as the cyclic voltammetry of the two iridium(III) complexes were also investigated.