AI Article Synopsis
- Crystalline SURMOF thin films made from porphyrin-based organic linkers are being explored for photon upconversion and photovoltaic applications.
- These materials show potential but raise concerns about their stability when exposed to light, necessitating further investigation.
- Research using various spectroscopy techniques reveals that prolonged illumination alters the material's photoresponse due to stable photodecomposition products, leading to the formation of short-lived radical pairs through electron transfer processes.
Article Abstract
Crystalline surface-anchored metal-organic framework (SURMOF) thin films made from porphyrin-based organic linkers have recently been used in both photon upconversion and photovoltaic applications. While these studies showed promising results, the question of photostability in this organic-inorganic hybrid material has to be investigated before applications can be considered. Here, we combine steady-state photoluminescence, transient absorption, and time-resolved electron paramagnetic resonance spectroscopy to examine the effects of prolonged illumination on a palladium-porphyrin based SURMOF thin film. We find that phototreatment leads to a change in the material's photoresponse caused by the creation of stable products of photodecomposition - likely chlorin - inside the SURMOF structure. When the mobile triplet excitons encounter such a defect site, a short-lived (80 ns) cation-anion radical pair can be formed by electron transfer, wherein the charges are localized at a porphyrin and the photoproduct site, respectively.
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| http://dx.doi.org/10.1039/c8cp05254a | DOI Listing |
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