Organic melt, electride, and CVD induced in situ deposition of luminescent lanthanide imidazolate MOFs on nanostructured alumina

Abstract

Highly luminescent MOF coatings were grown on nanostructured alumina membranes via melt, electride and CVD approaches.

Vapor‐Phase Deposition and Modification of Metal–Organic Frameworks: State‐of‐the‐Art and Future Directions

“…Nevertheless, it is important to note that PVD of a non‐porous Eu–imidazolate framework by short‐pulse laser ablation was recently reported by Müller‐Buschbaum and co‐workers . The same group also reported gas‐phase transport and deposition of in situ generated crystalline alkaline and rare earth metal imidazolates under thermal vacuum conditions (215 °C and 0.1 Pa) . These reports are demonstrations of gas‐phase transport of hybrid framework compounds and, although the deposited materials are not intrinsically nanoporous, come closest to PVD of MOFs.…”

“…[26] The same group also reported gas-phase transport and deposition of in situ generated crystalline alkaline and rare earth metal imidazolatesu nder thermalv acuum conditions (215 8Ca nd 0.1 Pa). [27] These reports are demonstrations of gas-phaset ransporto fh ybrid framework compounds and, although the deposited materials are not intrinsically nanoporous, come closest to PVD of MOFs.…”

Electronic Devices Using Open Framework Materials

“…Only a few OFM have been synthesized by PVD processes, mainly because of the lack of volatile yet stable precursors above 300 °C . Müller-Buschbaum and co-workers explored the PVD approach for a europium–imidazolate framework, as well alkaline and rare earth metal imidazolates under thermal vacuum conditions (215 °C and 0.1 Pa) . Lotsch and co-workers used femtosecond pulsed-laser deposition (femto-PLD) to fabricate ZIF-8 films impregnated with polyethylene glycol.…”

“…165 Muller-Buschbaum and coworkers explored the PVD approach for a europium− imidazolate framework, 166 as well alkaline and rare earth metal imidazolates under thermal vacuum conditions (215 °C and 0.1 Pa). 167 Lotsch and co-workers used femtosecond pulsed-laser deposition (femto-PLD) to fabricate ZIF-8 films impregnated with polyethylene glycol. By washing the films with ethanol, the polyethylene glycol additive can be removed, leading to ZIF-8 films on sapphire substrates.…”

Group 3 Elements and Lanthanide Metals

“…Inclusion of divalent europium is also suitable to reach 5d states around 30 000 cm −1 in MOFs to get intense luminescence by parity-allowed 4f-5d transitions. Recent reports on alkaline earth imidazolate frameworks doped with Eu 2+ of the formula 3 ∞ [AE(Im) 2 ] ∶ Eu 2+ , AE = Sr, Ba, illustrate the benefits for efficiency of the luminescence with high quantum yields up to >90% [22,127,130]. As the chemical surrounding influences the energetic height of the d states of Eu, a host lattice-related color tuning becomes available, as differences in the metal coordination of the host lattice influence the emissive 5d states.…”