The room-temperature phosphorescence (RTP) of metalloporphyrins, induced by the heavy atom effect (HAE), has been widely concerned in many fields, and the intense emission of RTP is highly desired. The phosphorescent transition rate ( k P ) has been used to quantitatively characterize the HAE’s intrinsic nature. However, the phosphorescent intensity was not determined by k P alone, non-phosphorescent transition ( k n P ) induced by surrounding factors was also involved. In this study, the influence of k n P on the RTP of palladium octaethylporphyrin (PdOEP), platinum octaethylporphyrin (PtOEP), and platinum tetraphenylporphyrin (PtTPP) was studied. The effect of k n P can be quantitatively described by an introduced parameter η , which was defined as η = k P /( k P + k n P ) . The method is proposed for determining the η of PdOEP, PtOEP, and PtTPP by the UV-visible absorption spectra, luminescence spectra, and phosphorescence dynamic curves. Our research provides a way to understand the effect of knP on the RTP, and may benefit the development and optimization of metalloporphyrins aiming at intense RTP.
In this work, the metalloporphyrin film of PtOEP/Poly (St-co-TFEMA) modified by nano Al 2 O 3 powder was prepared, and the enhancement performance of oxygen sensing was studied in detail. It was verified that the modified film extended the residence time of oxygen through the characterization of SEM. The phosphorescence intensity changes with the content of Al 2 O 3 and PtOEP were studied. The Stern-Volmer equations before and after modification of Al 2 O 3 powder was compared. It was found that the linearity of the calibration curve was still high, but the oxygen sensitivity value of K SV was significantly improved due to the increase of quenching probability between indicator and oxygen. Finally, the stability test shows that the Al 2 O 3 @PtOEP/Poly (St-co-TFEMA) oxygen sensing film presents a strong anti-photo-bleaching ability, and the response time is shortened.
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