Platinum(II) and palladium(II) complexes of a porphyrin with fluorenyl groups linked directly at the meso-positions (TFP) have been synthesized and characterized. Their luminescence properties in solution have been studied under ambient conditions and at 77 K. Compared to the corresponding complexes of tetraphenylporphyrin TPP, the emission is red-shifted in both cases. Radiative rate constants are found to be enhanced by the fluorenyl substituents, although non-radiative decay rates are also increased in solution. Short-wavelength UV excitation leads to no detectable fluorenyl-based fluorescence, indicating that a very efficient transfer of energy to the porphyrin occurs. An OLED in which PtTFP is used as a red phosphor has been prepared and its electroluminescence performance assessed. High current “roll-off” is significantly delayed to higher currents compared to previously described OLEDs that make use of standard platinum porphyrins as emitters, an effect which can be attributed to the shorter radiative lifetime of PtTFP.
已经合成了
卟啉铂(II)和
钯(II)配合物,其中
芴基直接连接在中位(
TFP),并对其进行了表征。在环境条件和77 K下研究了其在溶液中的发光特性。与
四苯基卟啉TPP的相应配合物相比,两种情况下的发射都发生了红移。发现辐射速率常数因
芴基取代物而增强,尽管溶液中的非辐射衰减率也增加了。短波长紫外激发不会导致可检测到的
芴基荧光,这表明
卟啉发生了非常有效的能量转移。已经制备了以Pt
TFP作为红色荧光粉的OLED,并评估了其电致发光性能。与之前描述的利用标准
铂卟啉作为发射体的OLED相比,高电流“滚降”被显著延迟到更高的电流,这种效应可归因于Pt
TFP的辐射寿命较短。