High efficiency organic light-emitting diodes with PEDOT-based conducting polymer anodes
High efficiency organic light-emitting diodes with PEDOT-based conducting polymer anodes
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DOI：
10.1039/b805994b
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发表时间：
2008-09
影响因子：
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通讯作者：
P. Levermore;R. Jin;Xu-Hua Wang;Lichun Chen;D. Bradley;J. Mello
中科院分区：
文献类型：
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作者：
P. Levermore;R. Jin;Xu-Hua Wang;Lichun Chen;D. Bradley;J. Mello
我们报道了一系列基于Lumation绿色1300系列（LG 1300）发光聚合物（LEP）的有机电致发光二极管（OLED）的电流-电压-亮度测量结果在一个实施方案中，使用聚（3，4-亚乙基二氧噻吩）（VPP-PEDOT）作为下层阳极材料，具有或不具有聚（3，4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）的表面涂层。测试了具有以下结构的四种器件：ITO/LG 1300/Ca、VPP-PEDOT/LG 1300/Ca、ITO/PEDOT：PSS/LG 1300/Ca和VPP-PEDOT/PEDOT：PSS/LG 1300/Ca。由于阳极处的空穴注入较差，具有未涂覆阳极的两个器件表现出低的亮度和效率：对于ITO，< 0.12 lm W−1，< 0.75 cd A−1;对于VPP-PEDOT，< 0.023 lm W−1，< 0.144 cd A−1。这两个具有PEDOT：PSS涂层阳极的器件表现出更高的发光度和效率：ITO/PEDOT：PSS为3.8 lm W−1，8.4 cd A−1; VPP-PEDOT/PEDOT：PSS为2.6 lm W−1，10.2 cd A−1，10000 cd m−2。电调制测量表明，提高的效率是由于聚（苯乙烯磺酸盐）的PEDOT：PSS，这导致电子被困在PEDOT：PSS/LG 1300接口，并在这样做增加了空穴注入到有源层的速率的组成部分。本手稿中报告的结果表明，VPP-PEDOT是ITO的可行替代阳极，能够在其他相同的OLED中产生上级效率（cd A−1）。
We report current–voltage-luminance measurements on a series of organic light-emitting diodes (OLEDs) based on a Lumation Green 1300 Series (LG1300) light-emitting polymer (LEP) provided by the Sumitomo Chemical Company, Ltd. The devices used either indium tin oxide (ITO) or vapour-phase polymerised poly(3,4-ethylenedioxythiophene) (VPP-PEDOT) as the underlying anode material with or without a surface coating of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). Four devices were tested with the structures: ITO/LG1300/Ca, VPP-PEDOT/LG1300/Ca, ITO/PEDOT:PSS/LG1300/Ca and VPP-PEDOT/PEDOT:PSS/LG1300/Ca. The two devices with uncoated anodes exhibited low luminosities and efficiencies due to poor hole injection at the anode: < 0.12 lm W−1, < 0.75 cd A−1 for ITO; and < 0.023 lm W−1, < 0.144 cd A−1 for VPP-PEDOT. The two devices with PEDOT:PSS-coated anodes exhibited much higher luminosities and efficiencies: 3.8 lm W−1, 8.4 cd A−1 for ITO/PEDOT:PSS; and 2.6 lm W−1, 10.2 cd A−1 for VPP-PEDOT/PEDOT:PSS at ∼10 000 cd m−2. Electromodulation measurements suggest the improved efficiencies are attributable to the poly(styrenesulfonate) component of PEDOT:PSS, which causes electrons to become trapped at the PEDOT:PSS/LG1300 interface and in so doing increases the rate of hole injection into the active layer. The results reported in this manuscript indicate that VPP-PEDOT is a viable alternative anode to ITO, capable of yielding superior efficiencies (cd A−1) in otherwise identical OLEDs.