Efficient Red-Emitting Electrophosphorescent Polymers

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• 作者：Xiao-Hui Yang ; Fang-Iy Wu ; Dieter Neher ; Chen-Han Chien ; Ching-Fong Shu
• 刊名：Chemistry of Materials
• 出版年：2008
• 出版时间：February 26, 2008
• 年：2008
• 卷：20
• 期：4
• 页码：1629 - 1635
• 全文大小：130K
• 年卷期：v.20,no.4(February 26, 2008)
• ISSN：1520-5002

文摘

We report the synthesis and characterization of a series of electrophosphorescent polymers with a polyfluorene backbone, containing a red-emitting iridium complex and carrier-transporting units as the substitutes of the C-9 position of fluorene. Different specimens and contents of the hole-transporting moieties were found to influence the electroluminescent properties of the polymers. Incorporation of a hole-transporting/electron-blocking interfacial layer and utilization of an efficient electron injection cathode led to the saturated red-emitting electrophosphorescent polymer devices with the peak luminance efficiency and power conversion efficiency of 9.3 cd A⁻¹ and 10.5 lm W⁻¹, respectively. The efficiencies were 8 cd A⁻¹/8 lm W⁻¹ and 5.9 cd A⁻¹/4.6 lm W⁻¹, respectively, at 100 and 1000 cd m⁻².