Photon Up-Conversion via Epitaxial Surface-Supported Metal–Organic Framework Thin Films with Enhanced Photocurrent

Ahmad, Shargeel; Liu, Jinxuan; Gong, Chenghuan; Zhao, Jianzhang; Sun, Licheng

doi:10.1021/acsaem.7b00023

Cited by 38 publications

(47 citation statements)

References 48 publications

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“…In addition, the power intensity dependent current density experiment which is one of the standard measurements for support of TTA-UC mechanism was carried out as displayed in Figure 4 b. Upon 532 nm green light excitation, a linear response was obtained from all power range which is different from quartic to linear behavior observed in TiO 2 -Zn-perylene SURMOF-PtOEP (PtOEP = Pt(II) octaethylporphine) [ 19 ] due to the efficient TEnT process [ 30 ], which favors the up-conversion process with a linear relationship than a quadratic relationship [ 27 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

“…The overall photovoltaic performances of TiO 2 -Zn-perylene SURMOF-Bodipy/PMMA device were examined as shown in Figure S13 and Table S2 . The device using TiO 2 -Zn-perylene SURMOF-Bodipy/PMMA as photoanode exhibits the best performances among the devices using TiO 2 -Zn-perylene SURMOF, TiO 2 -Bodipy/PMMA, and TiO 2 as photoanode due to TTA-UC [ 19 , 20 ]. Although the device performance is not very impressive, in the present work, we demonstrated the strategy with the upconverting SURMOF-based system for solar energy conversion.…”

Section: Resultsmentioning

confidence: 99%

“…The self-assembled bilayers of sensitizer (S) and acceptor (A) pair on top of metal oxide surface have been reported as one of the promising strategy to enhance the photocurrent via triplet–triplet annihilation (TTA-UC), which can effectively be utilized for dye sensitized solar cells (DSSC) [ 5 ]. Surface-anchored metal-organic frameworks (SURMOFs) with controlled growth orientation, regular monolithic porous crystalline frameworks show potential applications in gas separation [ 6 ], electronics [ 7 , 8 , 9 ], CO 2 reduction [ 10 , 11 , 12 , 13 ], water splitting [ 14 , 15 ], photovoltaics [ 16 , 17 , 18 ], and most recently in TTA-UC system [ 19 , 20 ]. As one of the potential energy materials, the use of SURMOFs for solar energy conversion [ 16 ], in particular DSSC, is challenging due to the poor solar capture ability and photo-induced charge carrier mobility, which lead to the sever charge recombination and weak photocurrent.…”

Section: Introductionmentioning

confidence: 99%

“…We have reported previously an epitaxial MOF thin film-based photoelectrochemical device by using highly oriented surface-anchored MOF thin film (SURMOF), Zn-perylene SURMOF as acceptor, and PtOEP (PtOEP = Pt(II) octaethylporphine) as sensitizer in acetonitrile solution [ 19 ]. Under green light irradiation, the sensitizer absorbs the photons and transfers the triplet energy to perylene molecules within SURMOFs, followed by the TTA-UC, leading to the enhancement of photocurrent.…”

Section: Introductionmentioning

confidence: 99%

“…The highly crystalline and well oriented Zn-perylene SURMOF with a thickness of ~600 nm was prepared on top of TiO 2 according to our previously reported protocol [ 19 ]. In the next step, the –COOH exposed Zn-perylene SURMOF was modified with Bodipy sensitizers [ 29 ] and PMMA via photochemical reaction which formed a glassy film of Bodipy/PMMA on top of TiO 2 -Zn-perylene SURMOF ( Figure S3 ).…”

Section: Introductionmentioning

confidence: 99%

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Metal–Organic Framework Thin Film-Based Dye Sensitized Solar Cells with Enhanced Photocurrent

Ahmad

Liu

et al. 2018

Materials

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Metal–organic framework thin film-based dye sensitized solar cell is fabricated with highly oriented, crystalline, and porous Zn-perylene metal-organic framework (MOF) thin film (SURMOF) which is integrated with Bodipy embedded in poly(methyl methacrylate). It has been demonstrated that the photocurrent can be enhanced by a factor of 5 relative to Zn-perylene MOF thin film due to triplet–triplet annihilation up-conversion between the Bodipy/PMMA sensitizer and the Zn-perylene MOF thin film acceptor using Co(bpy)32+/3+ as redox mediator.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metal–Organic Framework Thin Film-Based Dye Sensitized Solar Cells with Enhanced Photocurrent

Ahmad

Liu

et al. 2018

Materials

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Advanced Photoresponsive Materials Using the Metal–Organic Framework Approach

2019

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In recent years, a particularly attractive and novel strategy has become available for the fabrication of photoresponsive, porous, and crystalline molecular solids from appropriately functionalized chromophoric linkers. The crystallinity of these materials allows a rather straightforward description and analysis using theoretical methods, thus tremendously accelerating the design of novel materials. This new class of crystalline molecular solids is referred to as metal-organic frameworks, MOFs (or porous coordination polymers, PCPs). [1] MOFs are constructed from metal-/metal-oxo nodes and organic linkers (Figure 1). The incorporation of photoactive species into MOFs may be realized by using them as linkers (method L) or attaching them to a linker (method A), as shown in Figure 1a. In addition, the porosity of MOFs allows the loading of chromophoric compounds as guests (method G) into the pores of this interesting framework material.In this review article, we mainly focus on organic photoactive species, which are either simply loaded as guests into porous MOFs or used after appropriate functionalization as building blocks for the construction of the framework (methods L, A, and G). [2] It is important to note that in the context of photoresponsive behavior, MOFs carry a potential which by far exceeds that of nonporous coordination polymers. This is because simple loading of guest/solvent molecules of different size/polarity/functionality in the MOF pores can impart a large optical response, which is useful, e.g., for sensing applications. [3] As an example, the solvent-dependent optical response or solvatochromism [4] is illustrated in Figure 1b. Such effects cannot be realized for nonporous coordination polymers.The different types of photoresponsive molecules addressed in this review can be grouped into two classes. The first contains molecules where the structure remains essentially unchanged upon light-induced electronic excitation, and the second contains molecular species that change their structure or conformation upon absorption of photons (molecular switches).Light with a wavelength in the range 200-800 nm (6.2-1.5 eV) can excite a molecule to a transient excited electronic state. The transient state then decays to a low-energy state, either the parent ground state or another longer-lived excited state. Decay time scales are in the range 10 −12 -10 1 s, and the released energy can be radiative or nonradiative in nature. For many applications, nonradiative energy loss is unwanted, When fabricating macroscopic devices exploiting the properties of organic chromophores, the corresponding molecules need to be condensed into a solid material. Since optical absorption properties are often strongly affected by interchromophore interactions, solids with a well-defined structure carry substantial advantages over amorphous materials. Here, the metal-organic framework (MOF)-based approach is presented. By appropriate functionalization, most organic chromophores can be converted to function as linkers, which can coo...

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Triplet–Triplet Annihilation Upconversion in a MOF with Acceptor‐Filled Channels

Gharaati

Wang

Förster

et al. 2019

Chemistry A European J

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Figure 3. a) TTA-UC luminescence( UCL) intensity of solid CA/DPA@PCN-222(Pd)a sf unction of increasing excitationp ower density( emission slit width 15 nm) and b) integratedUCL intensity of CA/DPA@PCN-222(Pd)asa function of the excitationpower density (l exc = 532 nm). To avoid directe xcitation of DPA, a4 95 nm long-pass filter was placed between the 532 nm laser and the CA/DPA@PCN-222(Pd) sample.

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Photon Up-Conversion via Epitaxial Surface-Supported Metal–Organic Framework Thin Films with Enhanced Photocurrent

Cited by 38 publications

References 48 publications

Metal–Organic Framework Thin Film-Based Dye Sensitized Solar Cells with Enhanced Photocurrent

Metal–Organic Framework Thin Film-Based Dye Sensitized Solar Cells with Enhanced Photocurrent

Advanced Photoresponsive Materials Using the Metal–Organic Framework Approach

Triplet–Triplet Annihilation Upconversion in a MOF with Acceptor‐Filled Channels

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