Novel cyclometalated platinum (II) complex containing carrier-transporting groups: Synthesis, luminescence and application in single dopant white PLEDs
Novel cyclometalated platinum (II) complex containing carrier-transporting groups: Synthesis, luminescence and application in single dopant white PLEDs
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DOI：
10.1016/j.dyepig.2012.11.006
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发表时间：
2013-03
影响因子：
4.5
通讯作者：
Aihui Liang;Yanhu Li;Weiguo Zhu;Yafei Wang;F. Huang;Hongbin Wu;Yong Cao
中科院分区：
文献类型：
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作者：
Aihui Liang;Yanhu Li;Weiguo Zhu;Yafei Wang;F. Huang;Hongbin Wu;Yong Cao
为了研究载流子传输基团对聚合物发光性能的影响，特别是对激基缔合物/聚集体发光的影响，并获得用于单发射层结构白色聚合物发光二极管的单发射掺杂剂，合成了两种新型的铂（II）（2-（4′，6 ′-二氟苯基）吡啶基-N，C2′）合成并表征了含载体传输基团的吡啶甲酸酯单元，其中三苯氨基或恶二唑-三苯氨基官能化单元分别通过非共轭键悬挂在吡啶甲酸酯中。研究了它们的光物理、电化学和电致发光性质。与它们的母体铂配合物相比，这两种功能化的铂配合物在室温下在纯膜中表现出显着的红移光致发光曲线，并且在二氯甲烷中表现出更高的光致发光量子效率。此外，含恶二唑-三苯氨基双极传输基团的铂配合物具有更好的光致发光性能，有望作为单一掺杂剂应用于单发射层白色聚合物发光二极管。在掺杂剂浓度为4- 8wt%时，在该铂络合物掺杂的器件中观察到更稳定的白色光发射。在以聚芴为基质的器件中获得了1.01cdA− 1的最大发光效率和2177 cdm − 2的最大亮度。
In order to investigate the influence of carrier-transporting groups on the luminescent properties, especially on excimer/aggregation emission, and to obtain single emissive dopants used in white polymer light-emitting diodes with a single emissive-layer structure, two novel platinum complexes derived from a platinum(II) (2-(4′,6′-difluorophenyl)pyridinato-N,C2′)(picolinate) unit containing carrier-transporting groups were synthesized and characterized, where a triphenylamino or an oxadiazole-triphenylamino functionalized unit was pending into the picolinate by non-conjugated linkage, respectively. Their optophysical, electrochemical and electroluminescent properties were investigated. Compared to their parent platinum complex, both functionalized platinum complexes exhibited a significantly red-shifted photoluminescent profile in neat film and higher photoluminescent quantum efficiency in dichloromethane at room temperature. Furthermore, the platinum complex with oxadiazole-triphenylamino ambipolar transporting group exhibited better photoluminescent properties and offered potential application as a single dopant in a single emissive-layer-based white polymer light-emitting diode. More stable white light emissions were observed in this platinum complex-doped devices at dopant concentrations of 4–8 wt%. The maximum luminous efficiency of 1.01cdA−1and the maximum brightness of 2177cdm−2were obtained in the polyfluorene-hosted devices.