An Efficient Pyridine- and Oxadiazole-Containing Hole-Blocking Material for Organic Light-Emitting Diodes: Synthesis, Crystal Structure, and Device Performance
An Efficient Pyridine- and Oxadiazole-Containing Hole-Blocking Material for Organic Light-Emitting Diodes: Synthesis, Crystal Structure, and Device Performance
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DOI：
10.1021/cm0010250
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发表时间：
2001-03
影响因子：
8.6
通讯作者：
Changsheng Wang;G. Jung;Y. Hua;C. Pearson;M. Bryce;M. Petty;A. Batsanov;A. Goeta;J. Howard
中科院分区：
文献类型：
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作者：
Changsheng Wang;G. Jung;Y. Hua;C. Pearson;M. Bryce;M. Petty;A. Batsanov;A. Goeta;J. Howard
在本文中，我们重点研究了新型双(1,3,4-恶二唑)体系2,5-双[2-(4-叔丁基苯基)-1,3,4-恶二唑-5-基]吡啶(PDPyDP)的合成和结构。我们使用聚[2-甲氧基-5-(2-乙基己氧基)-1,4-亚苯基亚乙烯基] (MEH−PPV) 作为发射材料制造了发光二极管 (LED)，带有或不带有 PDPyDP 或其亚乙烯基类似物的热蒸发电子注入/空穴阻挡层(E)-1,2-双[2-(4-叔丁基苯基)-1,3,4-恶二唑-5-基]乙烯(PDVDP)或其亚苯基类似物1,4-双[2-(4-叔丁基苯基)-1,3,4-恶二唑-5-基]苯(PDPDP)。 PDPDP是OXD-7的对位异构体，OXD-7是一种广泛使用的分子电子传输材料。电致发光光谱表明光仅从 MEH-PPV 层发射。使用铝作为阴极，采用 PDPyDP 的双层 LED 比相应的单层器件或采用 PDVDP 或 PDPDP 作为电子注入层的器件效率更高。
In this paper, we focus on the synthesis and structure of the new bis(1,3,4-oxadiazole) system 2,5-bis[2-(4-tert-butylphenyl)-1,3,4-oxadiazol-5-yl]pyridine (PDPyDP). We have fabricated light-emitting diodes (LEDs) using poly[2-methoxy-5-(2-ethylhexoxy)-1,4-phenylene vinylene] (MEH−PPV) as the emissive material, with and without a thermally evaporated electron-injection/hole-blocking layer of either PDPyDP or its vinylene analogue (E)-1,2-bis[2-(4-tert-butylphenyl)-1,3,4-oxadiazol-5-yl]ethene (PDVDP) or its phenylene analogue 1,4-bis[2-(4-tert-butylphenyl)-1,3,4-oxadiazol-5-yl]benzene (PDPDP). PDPDP is the para isomer of OXD-7, which is a widely used molecular electron-transporting material. Electroluminescence spectra indicate that light is emitted only from the MEH−PPV layer. Using aluminum as the cathode, the bilayer LED with PDPyDP is considerably more efficient than the corresponding single-layer device or devices with PDVDP or PDPDP as the electron-injection layer.