Extended Conjugation Platinum(II) Porphyrins for use in Near-Infrared Emitting Organic Light Emitting Diodes
Extended Conjugation Platinum(II) Porphyrins for use in Near-Infrared Emitting Organic Light Emitting Diodes
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DOI：
10.1021/cm202242x
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发表时间：
2011-12-27
影响因子：
8.6
通讯作者：
Reynolds, John R.
中科院分区：
文献类型：
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作者：
Graham, Kenneth R.;Yang, Yixing;Reynolds, John R.
合成了一类pi扩展铂卟啉，并将其加入到溶液处理的聚合物发光二极管（PLEDs）和气相沉积的多层有机发光二极管（oled）中，从而产生了峰值发射范围为771 ~ 1005nm的器件。波长最长的发射体铂(11)-5,10,15,20-（3,5-二叔丁基苯基）四人卟啉（Pt-Ar(4)TAP）在1005 nm处最大发射，外量子效率（EQE）为0.12%，最大辐射发射率（R-max）为0.23 mW/cm(2)，在单层PLED结构中，电子传输层气相沉积后，其EQB提高到0.20%，R-max为0.57 mW/cm(2)。为了了解pi扩展pt -卟啉在led和oled中的取代基效应并提高其性能，研究了一个具有不同功能的pt -四苯并卟啉家族（pt - tbp）。测量了pt - tps在溶液和薄膜中的发光寿命，并证明了薄膜寿命与PLED和OLED效率之间存在很强的相关性。在取代量较少的pt -四苯基四苯并卟啉和取代量较多的pt -5,10,15,20-（3,5-二叔丁基苯基）四苯并卟啉之间，led的外量子效率（EQE）分别从2.07提高到2.49%和8.0提高到9.2%。双取代pt -5,15-（3,5-二叔丁基苯基）四苯并卟啉的PLED EQEs进一步提高到3.02%；然而，在测量到EQE为7.8%的oled时，没有观察到这种增加。
A family of pi-extended platinum(II) porphyrins has been synthesized and incorporated into solution processed polymer light emitting diodes (PLEDs) and vapor deposited multilayer organic light emitting diodes (OLEDs), giving rise to devices with peak emission ranging from 771 to 1005 nm. The longest wavelength emitter, platinum(11)-5,10,15,20-(3,5-di-tert-butylphenyl)tetraanthroporphyrin (Pt-Ar(4)TAP), shows an emission maximum at 1005 nm, an external quantum efficiency (EQE) of 0.12%, and a maximum radiant emittance (R-max) of 0.23 mW/cm(2) in single layer PLED architectures, which is enhanced to an EQB, of 0.20% with an R-max of 0.57 mW/cm(2) upon vapor deposition of an electron transport layer. In an effort to understand substituent effects and enhance the performance of pi-extended Pt-porphyrins in PLEDs and OLEDs, a family of Pt-tetrabenzoporphyrins (Pt-TBPs) with varying functionality was investigated. The luminescent lifetimes of the Pt-TBPs in solution and in films were measured, and a strong correlation was demonstrated between the film lifetimes and the PLED and OLED efficiencies. An improvement in external quantum efficiency (EQE) from 2.07 to 2.49% for PLEDs and from 8.0 to 9.2% for OLEDs was observed between the less substituted Pt-tetraphenyltetrabenzoporphyrin and the more substituted Pt-5,10,15,20-(3,5-di-tert-butylphenyl)tetrabenzoporphyrin. The PLED EQEs were further enhanced to 3.02% with the disubstituted Pt-5,15-(3,5-di-tert-butylphenyl)tetrabenzoporphyrin; however, this increase was not observed for the OLEDs where an EQE of 7.8% was measured.